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Table 4 Basic information about the structure dataset and non-redundant subsets. The non-redundant datasets contain only protein structures, the high resolution and whole PDB datasets have both structures of protein and nucleic acid. In the analysis for ion distribution around amino acids, the nucleic acid structures are not included

From: IDPM: an online database for ion distribution in protein molecules

DataSet

# structures

# structures with ions

Ratio

p-value 10E-7

14,647

4938

0.34

p-value 10E-40

25,546

9228

0.36

p-value 10E-80

36,455

12,685

0.35

Non-identical

70,902

26,717

0.38

High resolution (< 2.5 Å)

56,711

26,417

0.47

Whole PDB

130,065

51,687

0.40