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Volume 156, Issue 1

A distinct physiological role of MutY in mutation prevention in mycobacteria Free

Abstract

Oxidative damage to DNA results in the occurrence of 7,8-dihydro-8-oxoguanine (8-oxoG) in the genome. In eubacteria, repair of such damage is initiated by two major base-excision repair enzymes, MutM and MutY. We generated a MutY-deficient strain of to investigate the role of this enzyme in DNA repair. The MutY deficiency in did not result in either a noteworthy susceptibility to oxidative stress or an increase in the mutation rate. However, rifampicin-resistant isolates of the MutY-deficient strain showed distinct mutations in the rifampicin-resistance-determining region of . Besides the expected C to A (or G to T) mutations, an increase in A to C (or T to G) mutations was also observed. Biochemical characterization of mycobacterial MutY ( and ) revealed an expected excision of A opposite 8-oxoG in DNA. Additionally, excision of G and T opposite 8-oxoG was detected. MutY formed complexes with DNA containing 8-oxoG : A, 8-oxoG : G or 8-oxoG : T but not 8-oxoG : C pairs. Primer extension reactions in cell-free extracts of suggested error-prone incorporation of nucleotides into the DNA. Based on these observations, we discuss the physiological role of MutY in specific mutation prevention in mycobacteria.

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Keyword(s): EMSA, electrophoretic mobility shift assay , GO or 8-oxoG, 7,8-dihydro-8-oxoguanine and RRDR, rifampicin resistance determining region
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2010-01-01
2024-04-25
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A distinct physiological role of MutY in mutation prevention in mycobacteria
Microbiology 156, 88 (2010); https://doi.org/10.1099/mic.0.033621-0
/content/journal/micro/10.1099/mic.0.033621-0
/content/journal/micro/10.1099/mic.0.033621-0
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