Global pentapeptide statistics are far away from expected distributions.

Abstract:

:The relationships between polypeptide composition, sequence, structure and function have been puzzling biologists ever since first protein sequences were determined. Here, we study the statistics of occurrence of all possible pentapeptide sequences in known proteins. To compensate for the non-uniform distribution of individual amino acid residues in protein sequences, we investigate separately all possible permutations of every given amino acid composition. For the majority of permutation groups we find that pentapeptide occurrences deviate strongly from the expected binomial distributions, and that the observed distributions are also characterized by high numbers of outlier sequences. An analysis of identified outliers shows they often contain known motifs and rare amino acids, suggesting that they represent important functional elements. We further compare the pentapeptide composition of regions known to correspond to protein domains with that of non-domain regions. We find that a substantial number of pentapeptides is clearly strongly favored in protein domains. Finally, we show that over-represented pentapeptides are significantly related to known functional motifs and to predicted ancient structural peptides.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Poznański J,Topiński J,Muszewska A,Dębski KJ,Hoffman-Sommer M,Pawłowski K,Grynberg M

doi

10.1038/s41598-018-33433-8

subject

Has Abstract

pub_date

2018-10-11 00:00:00

pages

15178

issue

1

issn

2045-2322

pii

10.1038/s41598-018-33433-8

journal_volume

8

pub_type

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