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Table 1 Score matrix of the 10 NLS-motifs in the 13 NLS-bearing protein families, considering length, diversity and origin of NLS-like motifs

From: Evolutionary gradient of predicted nuclear localization signals (NLS)-bearing proteins in genomes of family Planctomycetaceae

NLS motif

length

diversity

origin

PRRRK

5

3

5.66

RKRKK

5

3

5.98

RPRRK

5

3

5.38

KRPRP

5

3

5.36

RKRRR

5

2

7.96

P.KKKRK

7

4

5.3

TKRS…M

8

11

5.14

KR.{10}KKKL

16

23

5.12

K[RK]{3,5}.{11,18}[RK]K.{2,3}K

25

38

8.54

[KR]{4}.{20,24}K{1,4}.K

31

58

11.4

  1. Note: ‘length’ means total amino acid number in NLS motif; ‘diversity’ refer to total amino acid types in a NLS motif, symbols as ‘.’ or ‘[]’ in NLS motif will be given an extra reward score (+1, + 0.5 respectively); ‘origin’ was used here to judge the potential evolutionary dominance of NLS motif through classification of the species accommodating the NLS motif. Taking Planctomycetaceae as control (score = 0), if one NLS motif is only found in non-planctomycete bacteria but not found in eukaryotic or Planctomycetaceae species, this NLS motif will be regarded as having low evolutionary dominance, and its scored will be punished (− 5) regardless of NLS motif abundance in these species. In contrast, if one NLS motif was detected in a eukaryotic species, it will obtain a reward score (+5), meanwhile, if the average abandance of the NLS motif in a eukaryotic species is high, that means, this NLS motif will have much higher evolutionary dominance, and it will be given an extra reward score (reward score = average abundance of the motif in eukaryotes/10)