Characterization of genes associated with glyoxal resistance in Escherichia coli: The mutations in upstream region of yafB promoter = 대장균 glyoxal 내성 관련 유전자 연구

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Glyoxal is toxic and mutagenic α-oxoaldehyde generated in vivo as an oxidation by-product of sugar metabolism. We selected glyoxal-resistant mutants from E. coli strain lacking major glyoxal-detoxifying genes, gloA and yqhD, by growing cells in media containing lethal concentration of glyoxal. The mutants car-ried diverse genomic rearrangements, such as multibase deletions and recombination, in the upstream region of yafB gene, encoding an aldo-keto reductase. Since these genomic lesions create transcriptional fusions of yafB gene to the upstream rrn regulon or eliminate a negative regulatory site, the mutants generally enhanced an expression of yafB gene. Glyoxal resistances of the mutants are correlated with the levels of yafB tran-scripts as well as the activities of aldo-keto reductase. An overproduction of YafB in the glyoxal-resistant mutant lacking the putative NsrR binding site provides an evidence that the yafB gene is negatively regulated by this protein. We also observed that the expression of yafB is enhanced with an increased concentration of glyoxal as well as a mutation in fnr gene, encoding a putative regulator. The bindings of NsrR and Fnr to the yafB promoter were also demonstrated by gel mobility shift assays.
Advisors
Park, Chan-Kyuresearcher박찬규
Description
한국과학기술원 : 생명과학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
511408/325007  / 020035018
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명과학과, 2012.8, [ iv, 72 p. ]

Keywords

glyoxal; aldo-keto reductase; recombination; rrn operon; 글리옥살; 알도-케토 리덕테이즈; 유전자 재조합; rRNA오페론; NsrR; NsrR

URI
http://hdl.handle.net/10203/179829
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=511408&flag=dissertation
Appears in Collection
BS-Theses_Ph.D.(박사논문)
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