Differences in DNA curvature-related sequence periodicity between prokaryotic chromosomes and phages, and relationship to chromosomal prophage content.

Abstract:

BACKGROUND:Periodic spacing of A-tracts (short runs of A or T) with the DNA helical period of ~10-11 bp is characteristic of intrinsically bent DNA. In eukaryotes, the DNA bending is related to chromatin structure and nucleosome positioning. However, the physiological role of strong sequence periodicity detected in many prokaryotic genomes is not clear. RESULTS:We developed measures of intensity and persistency of DNA curvature-related sequence periodicity and applied them to prokaryotic chromosomes and phages. The results indicate that strong periodic signals present in chromosomes are generally absent in phage genomes. Moreover, chromosomes containing prophages are less likely to possess a persistent periodic signal than chromosomes with no prophages. CONCLUSIONS:Absence of DNA curvature-related sequence periodicity in phages could arise from constraints associated with DNA packaging in the viral capsid. Lack of prophages in chromosomes with persistent periodic signal suggests that the sequence periodicity and concomitant DNA curvature could play a role in protecting the chromosomes from integration of phage DNA.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Abel J,Mrázek J

doi

10.1186/1471-2164-13-188

subject

Has Abstract

pub_date

2012-05-15 00:00:00

pages

188

issn

1471-2164

pii

1471-2164-13-188

journal_volume

13

pub_type

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