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Table 1 Performance of different OMP discrimination methods based on the GS-dataset.

From: Outer membrane proteins can be simply identified using secondary structure element alignment

Method

MCC

Ac(%)

Sn(%)

Sp(%)

DDa,b

0.541

82.4

78.8

83.3

NN_AACa,b

0.716

91.0

79.3

93.8

SVM_AAC_DPCa,b

0.816

93.9

90.9

94.7

SSEA-OMPc

0.772

90.9

72.9

98.1

SSEA-OMPd

0.906

96.2

91.5

98.1

  1. aDD, NN_AAC and SVM_AAC_DPC were developed in Suwa's group[5, 6, 15].
  2. bThe corresponding results are directly cited from [5, 6, 15].
  3. cBased on the stringent sequence-filtering method. Briefly, only the remaining sequences sharing a sequence identity less than 25%, a BLAST e-value greater than 0.01 and a PSI-BLAST e-value greater than 0.01 with the test protein were kept in the sequence library.
  4. dOnly the first sequence-filtering procedure was employed. Briefly, only the remaining sequences sharing a sequence identity less than 25% and a BLAST e-value greater than 0.01 with the test protein were kept in the sequence library. It should be emphasized that the performance of SSEA-OMP based on the first sequence-filtering procedure could be overestimated. We list the SSEA-OMP performance based on the first sequence-filtering procedure to allow a generally fair comparison between SSEA-OMP and the other three methods, since the performance of the other three methods were characterized by simple sequence identity-based filtering procedure [5, 6, 15].