Table 2 List of all descriptors along with their abbreviations and numbers of features

Simple composition

Amino acid composition

AAC

20

Dipeptide composition

DPC

400

Atom-type composition

ATC

5

Bond-type composition

BTC

4

Physicochemical properties

Amino acid index

AAI

553

Physicochemical property

PCP

30

Distribution & repeats

Distance distribution of repeats

DDR

20

Residue repeat information

RRI

20

Property repeat index

PRI

24

Shannon entropy

Shannon entropy of a residue

SER

20

Shannon entropy of properties

SEP

25

Shannon-entropy of a protein

SE

1

Miscellaneous

Amphiphilic pseudo amino acid composition

APAAC

23

Pseudo amino acid composition

PAAC

21

Composition enhanced transition and distribution

CeTD

189

Quasi-sequence order

QSO

42

Sequence order coupling number

SOC

2