Abstract
The principal response of many bacteria to DNA damage is mediated by a mechanism dependent on the LexA and RecA proteins. However, Mycobacterium tuberculosis was recently reported to regulate a majority of DNA repair genes independently of RecA and LexA, suggesting that an unknown RecA/LexA-independent mechanism controls the major DNA damage response pathway in this organism. Here we have identified a motif tTGTCRgtg-8nt-TAnnnT that defines a novel RecA/LexA-independent promoter (RecA-NDp) of M. tuberculosis. Furthermore, we show that the RecA-NDp type of promoter precedes DNA repair genes in other Actinomycetales.
MeSH terms
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Actinomycetales / genetics
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Bacterial Proteins / genetics
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Bacterial Proteins / metabolism
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Bacterial Proteins / physiology
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Base Sequence
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Consensus Sequence
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DNA Damage*
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DNA Repair / genetics*
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Gene Expression Regulation, Bacterial*
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Humans
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Molecular Sequence Data
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Mycobacterium tuberculosis / genetics*
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Mycobacterium tuberculosis / metabolism*
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Promoter Regions, Genetic*
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Rec A Recombinases / genetics
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Rec A Recombinases / metabolism
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Regulon
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Sequence Alignment
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Serine Endopeptidases / genetics
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Serine Endopeptidases / metabolism
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Sigma Factor / physiology
Substances
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Bacterial Proteins
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LexA protein, Bacteria
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Sigma Factor
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Rec A Recombinases
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Serine Endopeptidases