Frequent oligonucleotide motifs in genomes of three streptococci.

Abstract:

:Complete genomes of three closely related Gram-positive bacteria Streptococcus pyogenes, Streptococcus pneumoniae and Lactococcus lactis are analyzed for abundances of short DNA sequence motifs (frequent words). The character and extent of frequent words are strikingly different among these genomes. The frequent words of S.pneumoniae split into three categories: parts of the previously characterized RUP and BOX repetitive elements and a 24 bp tandem repeat in the gene SP1772. The most abundant frequent words of L.lactis are all related to the 13 bp motif, WWNTTACTGACRR or its inverted complement YYGTCAGTAANWW. Distributional analysis of this motif, which we called highly repetitive motif (HRM), indicates its possible dual role. Frequent occurrences immediately downstream of genes suggest a possible role in transcription termination whereas spacings of consecutive HRMs consistent with the DNA helical period are indicative of a protein-binding site. Two regions of the L.lactis genome feature an intriguing pattern of several periodically occurring HRMs separated by precisely 59 bp. In a striking contrast to S.pneumoniae and L.lactis, S.pyogenes contains hardly any frequent words.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Mrázek J,Gaynon LH,Karlin S

doi

10.1093/nar/gkf534

keywords:

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

4216-21

issue

19

eissn

0305-1048

issn

1362-4962

journal_volume

30

pub_type

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