Gains of ubiquitylation sites in highly conserved proteins in the human lineage
© Kim and Hahn; licensee BioMed Central Ltd. 2012
Received: 26 May 2012
Accepted: 14 November 2012
Published: 17 November 2012
Post-translational modification of lysine residues of specific proteins by ubiquitin modulates the degradation, localization, and activity of these target proteins. Here, we identified gains of ubiquitylation sites in highly conserved regions of human proteins that occurred during human evolution.
We analyzed human ubiquitylation site data and multiple alignments of orthologous mammalian proteins including those from humans, primates, other placental mammals, opossum, and platypus. In our analysis, we identified 281 ubiquitylation sites in 252 proteins that first appeared along the human lineage during primate evolution: one protein had four novel sites; four proteins had three sites each; 18 proteins had two sites each; and the remaining 229 proteins had one site each. PML, which is involved in neurodevelopment and neurodegeneration, acquired three sites, two of which have been reported to be involved in the degradation of PML. Thirteen human proteins, including ERCC2 (also known as XPD) and NBR1, gained human-specific ubiquitylated lysines after the human-chimpanzee divergence. ERCC2 has a Lys/Gln polymorphism, the derived (major) allele of which confers enhanced DNA repair capacity and reduced cancer risk compared with the ancestral (minor) allele. NBR1 and eight other proteins that are involved in the human autophagy protein interaction network gained a novel ubiquitylation site.
The gain of novel ubiquitylation sites could be involved in the evolution of protein degradation and other regulatory networks. Although gains of ubiquitylation sites do not necessarily equate to adaptive evolution, they are useful candidates for molecular functional analyses to identify novel advantageous genetic modifications and innovative phenotypes acquired during human evolution.
Ubiquitin is a 76-residue polypeptide that is highly conserved among eukaryotes. Ubiquitylation of the lysine residues of substrate proteins targets the ubiquitylated proteins for degradation by the proteasome . The ubiquitin-proteasome system is required for targeted degradation of key regulatory proteins and misfolded proteins . Ubiquitin and ubiquitin-like proteins, such as SUMO, ISG15, NEDD8, and ATG8, function as critical regulators of many cellular processes including signal transduction, cell-cycle control, and transcription . Ubiquitylation is known to crosstalk with the phosphorylation process to modulate various regulatory networks . For example, protein kinases can be regulated negatively or positively through ubiquitylation with or without degradation [3–5].
A large number of genetic modifications have occurred in the human lineage during primate evolution that might be responsible for the emergence of human phenotypes [6, 7]. These genetic modifications include the generation of novel genes and transcript variants [8, 9], loss of genes [10, 11], and acceleration of substitutions in specific nucleotide and amino acid sequences [12, 13]. For example, the FOXP2 protein, which is implicated in speech and language in humans, acquired two amino acid substitutions specific to humans after the divergence of humans and chimpanzees . In contrast to chimpanzee FOXP2, human FOXP2 differentially regulates genes involved in central nervous system development . Introduction of amino acids that are subject to post-translational modification (PTM), such as phosphorylation, during evolution, may be responsible for the reorganization of regulatory circuits . Some novel phosphorylation modification sites in human proteins that originated after the divergence of humans and chimpanzees have been identified .
To assess the impact of PTMs on human proteome evolution and to identify candidates for evolutionarily innovative PTM sites, a large amount of PTM data from human cells is needed. Recent progress in high-throughput screening by mass spectrometric analysis has enabled the large-scale characterization of PTM sites in the human proteome, including phosphorylation sites [17, 18], O-linked β-N-acetylglucosamine modification sites , lysine acetylation sites , and ubiquitylation sites [21–25].
We hypothesize that appearance of novel ubiquitylation sites in proteins along the human lineage during primate evolution may have modified protein regulatory networks, potentially resulting in the acquisition of novel phenotypic traits. To address this possibility, we developed a bioinformatics method to systematically identify gains of novel ubiquitylation sites in the human lineage during primate evolution. As a pilot study, we used ubiquitylation data for human proteins reported by Kim et al. and Wagner et al. as input data and then analyzed multiple sequence alignments of orthologous proteins from 37 mammalian species, including humans and 10 other primates. We then determined when the ubiquitylated lysine residues of the human proteins first appeared during primate evolution. Kim et al. and Wagner et al.’s datasets include lysines modified not only by ubiquitin, but also by ubiquitin-like proteins such as SUMO, ISG15, and NEDD8. In this report, we therefore use the term “ubiquitylation” to indicate both ubiquitin and ubiquitin-like protein modifications.
Detection and timing of gains of ubiquitylated lysines during human evolution
The timing of the gain of a ubiquitylated lysine was determined by finding the branch that enclosed the earliest shared lysine between humans and other primates on the mammalian phylogenetic tree. For example, the human PML residue Lys 394 (No. 182 in Additional file 2) is shared with chimpanzee, gorilla, and orangutan, but not with gibbon and other early-diverged primates. Hence, this lysine was gained in the ancestor of the great apes after they diverged from gibbons. In some cases, the timing could not be determined precisely due to a lack of informative sequences. For example, Lys 448 of the human BIRC2 protein (No. 28 in Additional file 1) is shared with the other great apes (chimpanzee, gorilla, and orangutan) but not with other primates that diverged earlier. Because the gibbon sequence is missing, however, it is not clear whether the gain of Lys 448 occurred in the ape clade (before the divergence of gibbons) or in the great ape clade (after the divergence of gibbons). In such ambiguous cases, we inferred that the novel lysine residue was gained in the smallest clade that included all the species with the novel lysine residue.
Human-specific gains of ubiquitylation sites
List of proteins with human-specific ubiquitylation sites
cancer susceptibility candidate 5
cytokine induced apoptosis inhibitor 1
excision repair cross-complementing rodent repair deficiency, complementation group 2
Fanconi anemia, complementation group A
neighbor of BRCA1 gene 1
non-SMC condensin I complex, subunit D2
SCO cytochrome oxidase deficient homolog 2 (yeast)
short chain dehydrogenase/reductase family 42E, member 1
SLX4 structure-specific endonuclease subunit homolog (S. cerevisiae)
tRNA methyltransferase 6 homolog (S. cerevisiae)
The ERCC2 (excision repair cross-complementing rodent repair deficiency, complementation group 2) protein, which is also known as XPD, is involved in transcription-coupled nucleotide excision repair and is implicated in cancer-prone xeroderma pigmentosum, trichothiodystrophy, and Cockayne syndrome . In the highly conserved C-terminal region of this protein, there is a human-specific ubiquitylated residue, Lys 701 (equivalent to Lys 751 of UniProt record P18074); other mammals have either a glutamine (Q) or an arginine (R) at this position (Figure 3A and No. 75 in Additional file 2). Interestingly, this position is polymorphic in humans (Lys/Gln; dbSNP accession rs13181). The lysine (codon AAG) is the derived allele while the glutamine (codon CAG) is the ancestral allele that is shared with other apes and monkeys. In the human population, the derived lysine allele is the major allele with a frequency of 73.285%. Humans with the ancestral (minor) glutamine allele have reduced DNA repair capacity, indicating that the derived lysine allele confers enhanced DNA repair capacity [29, 30]. Hence, the gain of a lysine at this position is advantageous in humans, although an association between ubiquitylation of the lysine and enhanced DNA repair capacity remains to be demonstrated.
The neighbor of BRCA1 gene 1 (NBR1) protein has been identified as one of the principle cargo receptors for selective autophagy of ubiquitylated targets [31, 32]. Abnormalities in NBR1 have been implicated in a type of progressive degenerative myopathy of older persons . In a highly conserved region of NBR1, there is a human-specific ubiquitylated residue, Lys 435, at which position all the other mammals examined have an glutamic acid (E) (Figure 3B and No. 155 in Additional file 2). This novel ubiquitylation site could play a role in the degradation or molecular function of NBR1. However, it is also possible that the ubiquitylation of Lys 435 was simply an indication of NBR1 degradation at the timepoint the experiment was performed.
Other notable gains of ubiquitylation sites
Human neuroguidin (NGDN) has a ubiquitylated Lys 33 that is shared with chimpanzees and gorillas, while other early-diverged primates (including orangutans) and all other mammals examined have a glutamine (Q) residue at this position (Figure 4B and No. 159 in Additional file 2). NGDN functions as a translational regulatory protein by interacting with eukaryotic initiation factor 4E (EIF4E) and cytoplasmic polyadenylation element binding (CPEB) protein, and is required for the development of the vertebrate nervous system .
The scavenger receptor class B member 1 (SCARB1) protein is a plasma membrane receptor for high-density lipoprotein cholesterol (HDL). It mediates cholesterol transfer to and from HDL  and is implicated in hepatitis C virus entry . In this study, SCARB1 Lys 184 was identified as one of 32 ubiquitylation sites that were acquired in the apes (Figure 4C and No. 212 in Additional file 2).
We found that 56 novel ubiquitylation sites in 54 proteins first appeared in the common ancestor of catarrhine primates. One representative case is WD repeat-containing protein 35 (WDR35) Lys 684, at which position most other mammals have a glutamic acid (E) (Figure 4D and No. 273 in Additional file 2). WDR35 has been implicated in spontaneous and tumor necrosis factor α-stimulated apoptosis . WDR35 is required for cilia production; its disruption results in a range of human ectodermal, visceral, and skeletal abnormalities [41, 42].
Of the 281 novel human ubiquitylated lysines, 116 in 107 proteins are shared with simians. One example is ataxin 2 (ATXN2) Lys 349, at which position all the other mammals examined have an arginine (R) (Figure 4E and No. 23 in Additional file 2). Expansion of a CAG repeat of the ATXN2 gene causes spinocerebellar ataxia type 2 .
There were 28 human ubiquitylated lysines in 28 proteins that were shared by all primates identified in this study. For example, aurora kinase B (AURKB) Lys 211 first appeared in primates after their divergence from the common ancestor of Euarchontoglires and is shared in all primates examined (Figure 4F and No. 24 in Additional file 2). Non-primate mammals have either a glutamine (Q) or an arginine (R) at this position. Aurora kinase B is a component of the chromosomal passenger complex that functions as a key regulator of mitosis  and is ubiquitylated by a Cullin 3-based E3 ubiquitin ligase during mitosis, which coordinates precise mitotic progression and completion of cytokinesis [45, 46].
This report presents the results of a pilot study to systematically identify gains of novel ubiquitylation sites in the human lineage since its divergence from the common ancestor of Euarchontoglires. To achieve this goal, we analyzed a human ubiquitylation dataset obtained from large-scale analyses [22, 24]. We identified 281 novel ubiquitylation sites in 252 highly conserved proteins that first appeared in the human lineage during primate evolution, 13 of which are human-specific. We anticipate that application of our method to analyze the ubiquitylation data recorded in databases such as UniProt and PhosphoSitePlus  or collected by other large-scale analyses [21, 23, 25] will result in identification of additional instances of gains of novel ubiquitylated lysines along the human lineage. We also expect that additional novel ubiquitylation sites will be discovered when higher quality protein sequences of non-human mammals become available. The total number of novel ubiquitylation sites we collected is likely to be an underestimate because of the draft quality of non-human genomes.
In addition to ubiquitylation, lysine residues can be modified by acetylation, and the cross-talk between these two lysine modifications is an important regulatory mechanism . Wagner et al. showed that 1,040 ubiquitylated lysines were also acetylated by comparing their 11,054 ubiquitylation sites with the 3,428 acetylation sites reported by Choudhary et al.. To check whether any novel ubiquitylation sites identified in this study are also acetylated, we compared our data with 3,948 non-redundant acetylation sites collected from the UniProt database and Choudhary et al. dataset. We found that nine ubiquitylated lysines were also acetylated. These are DLD Lys 320, FASN Lys 436, FDPS Lys 353, GAPDH Lys 84, LDHA Lys 251, LRPPRC Lys 613, MCM5 Lys 696, NUP205 Lys 41, and PARP10 Lys 928 (Nos. 63, 85, 89, 96, 125, 128, 135, 170, and 173, respectively, in Additional files 1 and 2). Thus, these nine newly-gained lysines can be modified not only by ubiquitylation but also by acetylation, suggesting regulatory cross-talk between lysine ubiquitylation and acetylation.
Although gains of novel ubiquitylation sites do not necessarily equate to innovative and adaptive changes, they are useful candidates to evaluate when searching for advantageous genetic modifications during human evolution. It is also possible that the modified peptides could be simply derived from protein molecules destined to be degraded or being degraded in the proteasome at the time of the experiment. Nevertheless, new ubiquitylation sites would provide novel target sites to modulate cellular processes by fine-tuning degradation, intracellular localization, or the regulatory network. Recently, the origins and evolution of mammalian and yeast ubiquitylation sites were evaluated by analyzing their eukaryotic and prokaryotic orthologs . The study revealed that ubiquitylation sites evolved at a similar rate to other protein modification sites such as phosphorylation sites, and that about 70% of 452 mammalian ubiquitylation sites first appeared during early vertebrate evolution. Interestingly, some ubiquitylation sites that appeared during animal evolution have been suggested to be associated with development of novel cross-talk pathways with other modifications such as phosphorylation and hydroxylation. This report supports our notion that gain of novel ubiquitylation sites could result in the evolution of protein regulatory networks.
In the case of ERCC2, the human-specific ubiquitylated lysine site is polymorphic in humans. The derived lysine allele is the major or normal allele, while the ancestral (minor) glutamine allele is designated as the mutant, which shows reduced DNA repair capacity; carriers of this minor allele therefore have an increased cancer risk . The gain of a ubiquitylated lysine in ERCC2 can be regarded as a concrete example of adaptive gains identified in this study. Molecular functional analyses of ubiquitylation sites collected in this study are likely to reveal more instances of advantageous functional outcomes.
Interestingly, among the 252 proteins, nine proteins (DZIP3, FKBP4, KIF23, NBR1, PFKP, PIK3C2A, PRKDC, SNAP23, and ZWINT) have been found in human autophagy protein interaction networks . NBR1 has been proposed to act as one of the principle receptors for selective autophagosomal degradation of ubiquitylated targets [31, 32]. Human NBR1 acquired a human-specific ubiquitylated residue, Lys 435, after the divergence of humans and chimpanzees. Eight other human proteins have novel ubiquitylated lysines that are shared with other primates. These nine proteins interact with known autophagy proteins such as N-ethylmaleimide-sensitive factor (NSF) and beclin 1, autophagy related (BECN1) . It is possible that the gain of new ubiquitylation sites could provide novel regulatory interactions for autophagy and/or other programmed protein degradation processes.
We developed a bioinformatics method to identify novel ubiquitylation sites that evolved along the human lineage, resulting in the identification of 281 novel ubiquitylation sites. The gain of novel ubiquitylation sites could result in novel ubiquitin-associated protein regulatory interactions. Proteins with a novel ubiquitylation site are useful candidates in the search for genetic modifications implicated in the emergence of novel phenotypes during human evolution.
Datasets and bioinformatics tools
To identify ubiquitylation sites in human proteins, we used the large-scale analysis datasets of Kim et al. and Wagner et al.. These researchers utilized a monoclonal antibody that recognizes characteristic diglycine-containing isopeptides following trypsin proteolysis . Peptide sequences with the modified lysine residue at the center were mapped to human protein sequences to identify them.
Multiple sequence alignments of the human proteins and orthologous proteins from other mammalian species were obtained from the University of California Santa Cruz (UCSC) Genome Browser Database (http://genome.ucsc.edu). The ‘CDS FASTA alignment from multiple alignment’ data, which are derived from the ‘multiz46way’ alignment data , were downloaded using the Table Browser tool of the UCSC Genome Browser. These alignment datasets included 36 mammalian species: humans, nine other primates (chimpanzee, gorilla, orangutan, rhesus macaque, baboon, marmoset, tarsier, bushbaby, and mouse lemur), eight other Euarchontoglires (treeshrew, mouse, rat, kangaroo rat, guinea pig, squirrel, rabbit, and pika), ten Laurasiatheria (dog, cat, horse, cow, dolphin, alpaca, megabat, microbat, hedgehog, and shrew), three Afrotheria (elephant, rock hyrax, and tenrec), two Xenarthra (armadillo and sloth), two Marsupialia (opossum and wallaby), and one Prototheria (platypus) species. The gibbon protein sequences, which were missing from the multiz46way data, were predicted from the genome assembly (nomLeu1) and included in the final alignment, resulting in 37 mammalian species, including 10 non-human primates. The phylogenetic tree of the 37 mammals used in this study is presented in Additional file 3.
The National Center for Biotechnology Information (NCBI) Protein database (http://www.ncbi.nlm.nih.gov/protein) was used to collect protein sequences for some species. The multiple sequence alignments were generated using MUSCLE (http://www.drive5.com/muscle).
Computational screening for candidate novel ubiquitylation sites
The overall procedure employed in this study is presented in Figure 1. The total number of non-redundant ubiquitylation sites used was 23,598 [22, 24]. We compared the peptide sequences containing the ubiquitylation site and the human proteins in the multiz46way (58,985 sets) to collect orthologous protein alignments. We found 22,912 human ubiquitylation sites in 6,216 protein alignments. We analyzed each modification site in the alignment and discarded cases where non-primate Euarchontoglires species (treeshrew, mouse, rat, kangaroo rat, guinea pig, squirrel, rabbit, and pika) had a lysine residue that was aligned with the ubiquitylated lysine of the human proteins. A total of 441 sites in 380 protein alignments were retained after this computational screening step and subjected to manual inspection.
Manual inspection to select ubiquitylated lysine residues that appeared along the human lineage
As the final step, we manually examined the 441 candidates to identify plausible cases of gains of ubiquitylation sites in the human lineage during primate evolution. First, when multiple copies of the human protein sequence in a dataset were present in the human genome, the set was discarded due to uncertainty about the orthology of the aligned proteins. We also discarded cases showing low sequence conservation and cases where many non-primate proteins had lysine residues that were aligned with the human ubiquitylated lysine.
Next, we curated each protein dataset. Because the original multiz46way data set did not include gibbon sequences, we identified and added the orthologous gibbon proteins to the dataset. Proteins with low quality sequences, with missing amino acids, or derived from older genome assemblies were replaced with curated sequences retrieved from the NCBI Protein database or newly predicted sequences from the most recent assemblies. Some protein sequences with low quality regions or gaps that could not be amended were removed from the dataset. The multiple sequence alignment was rebuilt using MUSCLE.
Finally, 281 sites in 252 proteins were collected. We examined the multiple alignments to estimate the timing of the gain of the ubiquitylated lysine residue. Possible functional consequences of the gain of the ubiquitylation site were assessed by a literature survey. The positions of the residues noted in this manuscript are derived from the datasets of Kim et al. and Wagner et al., which are, in turn, based on the International Protein Index (IPI) (http://www.ebi.ac.uk/IPI) and may differ from those of the UniProt or NCBI Protein databases.
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012R1A1B3001513) and by the Next-Generation BioGreen 21 Program (SSAC2011-PJ008220), Rural Development Administration, Republic of Korea.
- Kerscher O, Felberbaum R, Hochstrasser M: Modification of proteins by ubiquitin and ubiquitin-like proteins. Annu Rev Cell Dev Biol 2006, 22: 159–180. 10.1146/annurev.cellbio.22.010605.093503View ArticlePubMedGoogle Scholar
- Konstantinova IM, Tsimokha AS, Mittenberg AG: Role of proteasomes in cellular regulation. Int Rev Cell Mol Biol 2008, 267: 59–124.View ArticlePubMedGoogle Scholar
- Hunter T: The age of crosstalk: phosphorylation, ubiquitination, and beyond. Mol Cell 2007, 28(5):730–738. 10.1016/j.molcel.2007.11.019View ArticlePubMedGoogle Scholar
- Chen ZJ: Ubiquitin signalling in the NF-κB pathway. Nat Cell Biol 2005, 7(8):758–765. 10.1038/ncb0805-758PubMed CentralView ArticlePubMedGoogle Scholar
- Al-Hakim AK, Zagorska A, Chapman L, Deak M, Peggie M, Alessi DR: Control of AMPK-related kinases by USP9X and atypical Lys(29)/Lys(33)-linked polyubiquitin chains. Biochem J 2008, 411(2):249–260. 10.1042/BJ20080067View ArticlePubMedGoogle Scholar
- Li WH, Saunders MA: News and views: the chimpanzee and us. Nature 2005, 437(7055):50–51. 10.1038/437050aView ArticlePubMedGoogle Scholar
- Varki A, Altheide TK: Comparing the human and chimpanzee genomes: searching for needles in a haystack. Genome Res 2005, 15(12):1746–1758. 10.1101/gr.3737405View ArticlePubMedGoogle Scholar
- Kim DS, Hahn Y: Identification of human-specific transcript variants induced by DNA insertions in the human genome. Bioinformatics 2011, 27(1):14–21. 10.1093/bioinformatics/btq612View ArticlePubMedGoogle Scholar
- Rosso L, Marques AC, Reichert AS, Kaessmann H: Mitochondrial targeting adaptation of the hominoid-specific glutamate dehydrogenase driven by positive Darwinian selection. PLoS Genet 2008, 4(8):e1000150. 10.1371/journal.pgen.1000150PubMed CentralView ArticlePubMedGoogle Scholar
- Hahn Y, Jeong S, Lee B: Inactivation of MOXD2 and S100A15A by exon deletion during human evolution. Mol Biol Evol 2007, 24(10):2203–2212. 10.1093/molbev/msm146View ArticlePubMedGoogle Scholar
- Zhu J, Sanborn JZ, Diekhans M, Lowe CB, Pringle TH, Haussler D: Comparative genomics search for losses of long-established genes on the human lineage. PLoS Comput Biol 2007, 3(12):e247. 10.1371/journal.pcbi.0030247PubMed CentralView ArticlePubMedGoogle Scholar
- Enard W, Przeworski M, Fisher SE, Lai CS, Wiebe V, Kitano T, Monaco AP, Paabo S: Molecular evolution of FOXP2, a gene involved in speech and language. Nature 2002, 418(6900):869–872. 10.1038/nature01025View ArticlePubMedGoogle Scholar
- Pollard KS, Salama SR, Lambert N, Lambot MA, Coppens S, Pedersen JS, Katzman S, King B, Onodera C, Siepel A, et al.: An RNA gene expressed during cortical development evolved rapidly in humans. Nature 2006, 443(7108):167–172. 10.1038/nature05113View ArticlePubMedGoogle Scholar
- Konopka G, Bomar JM, Winden K, Coppola G, Jonsson ZO, Gao F, Peng S, Preuss TM, Wohlschlegel JA, Geschwind DH: Human-specific transcriptional regulation of CNS development genes by FOXP2. Nature 2009, 462(7270):213–217. 10.1038/nature08549PubMed CentralView ArticlePubMedGoogle Scholar
- Lynch VJ, May G, Wagner GP: Regulatory evolution through divergence of a phosphoswitch in the transcription factor CEBPB. Nature 2011, 480(7377):383–386. 10.1038/nature10595View ArticlePubMedGoogle Scholar
- Kim DS, Hahn Y: Identification of novel phosphorylation modification sites in human proteins that originated after the human-chimpanzee divergence. Bioinformatics 2011, 27(18):2494–2501.PubMedGoogle Scholar
- Olsen JV, Blagoev B, Gnad F, Macek B, Kumar C, Mortensen P, Mann M: Global, in vivo, and site-specific phosphorylation dynamics in signaling networks. Cell 2006, 127(3):635–648. 10.1016/j.cell.2006.09.026View ArticlePubMedGoogle Scholar
- Molina H, Horn DM, Tang N, Mathivanan S, Pandey A: Global proteomic profiling of phosphopeptides using electron transfer dissociation tandem mass spectrometry. Proc Natl Acad Sci USA 2007, 104(7):2199–2204. 10.1073/pnas.0611217104PubMed CentralView ArticlePubMedGoogle Scholar
- Zhao P, Viner R, Teo CF, Boons GJ, Horn D, Wells L: Combining high-energy C-trap dissociation and electron transfer dissociation for protein O-GlcNAc modification site assignment. J Proteome Res 2011, 10(9):4088–4104. 10.1021/pr2002726PubMed CentralView ArticlePubMedGoogle Scholar
- Choudhary C, Kumar C, Gnad F, Nielsen ML, Rehman M, Walther TC, Olsen JV, Mann M: Lysine acetylation targets protein complexes and co-regulates major cellular functions. Science 2009, 325(5942):834–840. 10.1126/science.1175371View ArticlePubMedGoogle Scholar
- Emanuele MJ, Elia AE, Xu Q, Thoma CR, Izhar L, Leng Y, Guo A, Chen YN, Rush J, Hsu PW, et al.: Global identification of modular cullin-RING ligase substrates. Cell 2011, 147(2):459–474. 10.1016/j.cell.2011.09.019PubMed CentralView ArticlePubMedGoogle Scholar
- Kim W, Bennett EJ, Huttlin EL, Guo A, Li J, Possemato A, Sowa ME, Rad R, Rush J, Comb MJ, et al.: Systematic and quantitative assessment of the ubiquitin-modified proteome. Mol Cell 2011, 44(2):325–340. 10.1016/j.molcel.2011.08.025PubMed CentralView ArticlePubMedGoogle Scholar
- Lee KA, Hammerle LP, Andrews PS, Stokes MP, Mustelin T, Silva JC, Black RA, Doedens JR: Ubiquitin ligase substrate identification through quantitative proteomics at both the protein and peptide levels. J Biol Chem 2011, 286(48):41530–41538. 10.1074/jbc.M111.248856PubMed CentralView ArticlePubMedGoogle Scholar
- Wagner SA, Beli P, Weinert BT, Nielsen ML, Cox J, Mann M, Choudhary C: A proteome-wide, quantitative survey of in vivo ubiquitylation sites reveals widespread regulatory roles. Mol Cell Proteomics 2011, 10(10):M111.013284. 10.1074/mcp.M111.013284PubMed CentralView ArticlePubMedGoogle Scholar
- Xu G, Paige JS, Jaffrey SR: Global analysis of lysine ubiquitination by ubiquitin remnant immunoaffinity profiling. Nat Biotechnol 2010, 28(8):868–873. 10.1038/nbt.1654PubMed CentralView ArticlePubMedGoogle Scholar
- Hornbeck PV, Kornhauser JM, Tkachev S, Zhang B, Skrzypek E, Murray B, Latham V, Sullivan M: PhosphoSitePlus: a comprehensive resource for investigating the structure and function of experimentally determined post-translational modifications in man and mouse. Nucleic Acids Res 2012, 40(Database issue):D261-D270.PubMed CentralView ArticlePubMedGoogle Scholar
- Blanchette M, Kent WJ, Riemer C, Elnitski L, Smit AF, Roskin KM, Baertsch R, Rosenbloom K, Clawson H, Green ED, et al.: Aligning multiple genomic sequences with the threaded blockset aligner. Genome Res 2004, 14(4):708–715. 10.1101/gr.1933104PubMed CentralView ArticlePubMedGoogle Scholar
- Lehmann AR: DNA repair-deficient diseases, xeroderma pigmentosum, cockayne syndrome and trichothiodystrophy. Biochimie 2003, 85(11):1101–1111. 10.1016/j.biochi.2003.09.010View ArticlePubMedGoogle Scholar
- Hemminki K, Xu G, Angelini S, Snellman E, Jansen CT, Lambert B, Hou SM: XPD exon 10 and 23 polymorphisms and DNA repair in human skin in situ. Carcinogenesis 2001, 22(8):1185–1188. 10.1093/carcin/22.8.1185View ArticlePubMedGoogle Scholar
- Spitz MR, Wu X, Wang Y, Wang LE, Shete S, Amos CI, Guo Z, Lei L, Mohrenweiser H, Wei Q: Modulation of nucleotide excision repair capacity by XPD polymorphisms in lung cancer patients. Cancer Res 2001, 61(4):1354–1357.PubMedGoogle Scholar
- Kirkin V, Lamark T, Sou YS, Bjorkoy G, Nunn JL, Bruun JA, Shvets E, McEwan DG, Clausen TH, Wild P, et al.: A role for NBR1 in autophagosomal degradation of ubiquitinated substrates. Mol Cell 2009, 33(4):505–516. 10.1016/j.molcel.2009.01.020View ArticlePubMedGoogle Scholar
- Lamark T, Kirkin V, Dikic I, Johansen T: NBR1 and p62 as cargo receptors for selective autophagy of ubiquitinated targets. Cell Cycle 2009, 8(13):1986–1990. 10.4161/cc.8.13.8892View ArticlePubMedGoogle Scholar
- D’Agostino C, Nogalska A, Cacciottolo M, Engel WK, Askanas V: Abnormalities of NBR1, a novel autophagy-associated protein, in muscle fibers of sporadic inclusion-body myositis. Acta Neuropathol 2011, 122(5):627–636. 10.1007/s00401-011-0874-3View ArticlePubMedGoogle Scholar
- Tatham MH, Geoffroy MC, Shen L, Plechanovova A, Hattersley N, Jaffray EG, Palvimo JJ, Hay RT: RNF4 is a poly-SUMO-specific E3 ubiquitin ligase required for arsenic-induced PML degradation. Nat Cell Biol 2008, 10(5):538–546. 10.1038/ncb1716View ArticlePubMedGoogle Scholar
- Saeed S, Logie C, Stunnenberg HG, Martens JH: Genome-wide functions of PML-RARalpha in acute promyelocytic leukaemia. Br J Cancer 2011, 104(4):554–558. 10.1038/sj.bjc.6606095PubMed CentralView ArticlePubMedGoogle Scholar
- Salomoni P, Betts-Henderson J: The role of PML in the nervous system. Mol Neurobiol 2011, 43(2):114–123. 10.1007/s12035-010-8156-yView ArticlePubMedGoogle Scholar
- Jung MY, Lorenz L, Richter JD: Translational control by neuroguidin, a eukaryotic initiation factor 4E and CPEB binding protein. Mol Cell Biol 2006, 26(11):4277–4287. 10.1128/MCB.02470-05PubMed CentralView ArticlePubMedGoogle Scholar
- Connelly MA, Williams DL: Scavenger receptor BI: a scavenger receptor with a mission to transport high density lipoprotein lipids. Curr Opin Lipidol 2004, 15(3):287–295. 10.1097/00041433-200406000-00008View ArticlePubMedGoogle Scholar
- Ye J: Reliance of host cholesterol metabolic pathways for the life cycle of hepatitis C virus. PLoS Pathog 2007, 3(8):e108. 10.1371/journal.ppat.0030108PubMed CentralView ArticlePubMedGoogle Scholar
- Feng GG, Li C, Huang L, Tsunekawa K, Sato Y, Fujiwara Y, Komatsu T, Honda T, Fan JH, Goto H, et al.: Naofen, a novel WD40-repeat protein, mediates spontaneous and tumor necrosis factor-induced apoptosis. Biochem Biophys Res Commun 2010, 394(1):153–157. 10.1016/j.bbrc.2010.02.133View ArticlePubMedGoogle Scholar
- Gilissen C, Arts HH, Hoischen A, Spruijt L, Mans DA, Arts P, van Lier B, Steehouwer M, van Reeuwijk J, Kant SG, et al.: Exome sequencing identifies WDR35 variants involved in Sensenbrenner syndrome. Am J Hum Genet 2010, 87(3):418–423. 10.1016/j.ajhg.2010.08.004PubMed CentralView ArticlePubMedGoogle Scholar
- Mill P, Lockhart PJ, Fitzpatrick E, Mountford HS, Hall EA, Reijns MA, Keighren M, Bahlo M, Bromhead CJ, Budd P, et al.: Human and mouse mutations in WDR35 cause short-rib polydactyly syndromes due to abnormal ciliogenesis. Am J Hum Genet 2011, 88(4):508–515. 10.1016/j.ajhg.2011.03.015PubMed CentralView ArticlePubMedGoogle Scholar
- Pulst SM, Nechiporuk A, Nechiporuk T, Gispert S, Chen XN, Lopes-Cendes I, Pearlman S, Starkman S, Orozco-Diaz G, Lunkes A, et al.: Moderate expansion of a normally biallelic trinucleotide repeat in spinocerebellar ataxia type 2. Nat Genet 1996, 14(3):269–276.View ArticlePubMedGoogle Scholar
- Ruchaud S, Carmena M, Earnshaw WC: Chromosomal passengers: conducting cell division. Nat Rev Mol Cell Biol 2007, 8(10):798–812. 10.1038/nrm2257View ArticlePubMedGoogle Scholar
- Sumara I, Quadroni M, Frei C, Olma MH, Sumara G, Ricci R, Peter M: A Cul3-based E3 ligase removes Aurora B from mitotic chromosomes, regulating mitotic progression and completion of cytokinesis in human cells. Dev Cell 2007, 12(6):887–900. 10.1016/j.devcel.2007.03.019View ArticlePubMedGoogle Scholar
- Maerki S, Olma MH, Staubli T, Steigemann P, Gerlich DW, Quadroni M, Sumara I, Peter M: The Cul3-KLHL21 E3 ubiquitin ligase targets aurora B to midzone microtubules in anaphase and is required for cytokinesis. J Cell Biol 2009, 187(6):791–800. 10.1083/jcb.200906117PubMed CentralView ArticlePubMedGoogle Scholar
- Caron C, Boyault C, Khochbin S: Regulatory cross-talk between lysine acetylation and ubiquitination: role in the control of protein stability. Bioessays 2005, 27(4):408–415. 10.1002/bies.20210View ArticlePubMedGoogle Scholar
- Hagai T, Toth-Petroczy A, Azia A, Levy Y: The origins and evolution of ubiquitination sites. Mol Biosyst 2012, 8(7):1865–1877. 10.1039/c2mb25052gView ArticlePubMedGoogle Scholar
- Behrends C, Sowa ME, Gygi SP, Harper JW: Network organization of the human autophagy system. Nature 2010, 466(7302):68–76. 10.1038/nature09204PubMed CentralView ArticlePubMedGoogle Scholar
- Moses AM, Liku ME, Li JJ, Durbin R: Regulatory evolution in proteins by turnover and lineage-specific changes of cyclin-dependent kinase consensus sites. Proc Natl Acad Sci USA 2007, 104(45):17713–17718. 10.1073/pnas.0700997104PubMed CentralView ArticlePubMedGoogle Scholar
- Peng J, Schwartz D, Elias JE, Thoreen CC, Cheng D, Marsischky G, Roelofs J, Finley D, Gygi SP: A proteomics approach to understanding protein ubiquitination. Nat Biotechnol 2003, 21(8):921–926. 10.1038/nbt849View ArticlePubMedGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.