Secondary structure specific simpler prediction models for protein backbone angles

BMC Bioinformatics

Table 7 Performance of SAP4SS, SAP, OPUS-TASS (in columns OTASS), and SPOT-1D (in columns SPOT) when our testing proteins are grouped based on their lengths

Testing proteins		\(\phi\)				\(\psi\)				\(\theta\)			\(\tau\)
Testing proteins		SAP4SS	SAP	OTASS	SPOT	SAP4SS	SAP	OTASS	SPOT	SAP4SS	SAP	SPOT	SAP4SS	SAP	SPOT
Length	Count	MAE	\(\Delta\)%	\(\Delta\)%	\(\Delta\)%	MAE	\(\Delta\)%	\(\Delta\)%	\(\Delta\)%	MAE	\(\Delta\)%	\(\Delta\)%	MAE	\(\Delta\)%	\(\Delta\)%
001–100	232	14.60	+ 2.05	+ 1.03	+ 3.77	18.47	+ 1.08	+ 15.54	+ 17.16	5.63	+ 1.95	+ 9.59	20.39	+ 3.68	+ 13.68
101–200	424	15.32	+ 2.48	+ 1.17	+ 3.98	18.78	+ 2.50	+ 15.65	+ 19.33	6.05	+ 2.64	+ 9.75	22.01	+ 4.27	+ 14.08
201–300	294	15.24	+ 2.49	+ 2.23	+ 4.66	18.41	+ 2.66	+ 19.77	+ 23.19	5.95	+ 2.35	+ 11.93	22.00	+ 3.27	+ 16.55
301–400	190	15.60	+ 2.88	− 0.19	+ 3.53	18.58	+ 3.39	+ 16.85	+ 22.50	6.04	+ 2.98	+ 11.42	21.23	+ 5.37	+ 17.57
401–500	103	15.80	+ 2.09	+ 3.92	+ 7.28	18.57	+ 2.85	+ 27.95	+ 31.07	5.96	+ 2.52	+ 16.61	20.75	+ 4.14	+ 24.24
501–800	78	16.64	+ 1.98	+ 1.08	+ 4.21	20.59	+ 2.77	+ 19.14	+ 23.75	6.34	+ 2.68	+ 12.93	22.96	+ 3.48	+ 19.99
Overall	1321	15.59	+ 2.37	+ 1.54	+ 4.55	18.87	+ 2.76	+ 19.18	+ 23.21	6.03	+ 2.65	+ 12.11	21.71	+ 4.10	+ 17.73

In the table, \(\Delta\)% of a method (e.g. SAP, OPUS-TASS, or SPOT-1D) is computed as \(\dfrac{\textsf {its MAE} - \textsf {SAP4SS MAE}}{\textsf {SAP4SS MAE}}*100\%\). The greater the value of \(\Delta\)MAE, the worse the performance of the method w.r.t. SAP4SS

ISSN: 1471-2105