Affiliation:
1. Division of Mycobacterial Research, National Institute for Medical Research, London NW7 1AA, England
Abstract
ABSTRACT
The bases of the mycobacterial SOS box important for LexA binding were determined by replacing each base with every other and examining the effect on the induction of a reporter gene following DNA damage. This analysis revealed that the SOS box was longer than originally thought by 2 bp in each half of the palindromic site. A search of the
Mycobacterium tuberculosis
genome sequence with the new consensus, TCGAAC(N)
4
GTTCGA, identified 4 sites which were perfect matches and 12 sites with a single mismatch which were predicted to bind LexA. Genes which could potentially be regulated by these SOS boxes were ascertained from their positions relative to the sites. Examination of expression data for these genes following DNA damage identified 12 new genes which are most likely regulated by LexA as well as the known
M. tuberculosis
DNA damage-inducible genes
recA
,
lexA
, and
ruvC
. Of these 12 genes, only 2 have a predicted function:
dnaE2
, a component of DNA polymerase III, and
linB
, which is similar to 1,3,4,6-tetrachloro-1,4-cylcohexadiene hydrolase. Curiously, of the remaining 10 genes predicted to be LexA regulated, 7 are members of the
M. tuberculosis
13E12 repeat family, which has some of the characteristics of mobile elements.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
87 articles.
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