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Rv0500A is a transcription factor that links Mycobacterium tuberculosis environmental response and division

ABSTRACT: The purpose of this study was to identify genes that are differentially expressed upon rv0500A over-expression, to reveal the impact of Rv0500A on global transcription in different environmental conditions.

ORGANISM(S): Mycobacterium tuberculosis str. Erdman = ATCC 35801

PROVIDER: GSE179552 | GEO | 2022/02/15

REPOSITORIES: GEO

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Project description:BackgroundMembers of the WhiB-like (Wbl) protein family possess iron-sulfur clusters and are implicated in the regulation of developmental processes in Actinomycetes. Mycobacterium tuberculosis possesses seven Wbl proteins. The [4Fe-4S] cluster of M. tuberculosis WhiB1 is relatively insensitive to O(2) but very sensitive to nitric oxide (NO). Nitric oxide nitrosylates the WhiB1 iron-sulfur cluster and promotes DNA-binding; the apo-forms of WhiB1 also bind DNA. However, the molecular requirements for iron-sulfur cluster acquisition and for DNA-binding by WhiB1 are poorly characterized.Methods and findingsWhiB1 variants were created by site-directed mutagenesis and the abilities of the corresponding proteins to acquire an iron-sulfur cluster and/or bind to whiB1 promoter DNA were assessed. All four Cys residues (Cys9, 37, 40, and 46) in the N-terminal region of WhiB1 were required for incorporation of a [4Fe-4S] cluster, whereas a possible alternative cluster ligand Asp13 (by analogy with M. smegmatis WhiB2) was not. The C-terminal region of WhiB1 is predicted to house the DNA-binding domain of the protein consisting of a predicted ?-turn ((58)GVWGG(62)) followed by two amino acid motifs ((72)KRRN(75) and (78)TKAR(81)) that are conserved in WhiB1 proteins. Gly residues (Gly58, 61 and 62) in the ?-turn and positively-charged residues (Lys72, Arg73, Arg74, Lys79 and Arg81) in the downstream conserved regions were required for binding of WhiB1 DNA.ConclusionsSite-directed mutagenesis of M. tuberculosis whiB1 and characterization of the corresponding proteins has been used to explore structure-function relationships of the NO-responsive transcription factor WhiB1. This showed that all four conserved Cys residues in the N-terminal region are required for incorporation of iron-sulfur clusters but not for DNA-binding. Analysis of variants with amino acid substitutions in the C-terminal region revealed the crucial roles played by a predicted ?-turn and two conserved positively-charged motifs in facilitating DNA-binding, but not iron-sulfur cluster acquisition, by WhiB1.

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Rv0500A is a transcription factor that links Mycobacterium tuberculosis environmental response and division

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