Journal Article

Characterization of a mutation in the acetolactate synthase of <i>Bacillus subtilis</i> that causes a cold-sensitive phenotype

Frank Wiegeshoff and Mohamed A. Marahiel

in FEMS Microbiology Letters

Volume 272, issue 1, pages 30-34
Published in print July 2007 |
Published online May 2007 | e-ISSN: 1574-6968 | DOI: https://dx.doi.org/10.1111/j.1574-6968.2007.00739.x

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Abstract

The Bacillus subtilis laboratory strain JH642 shows a cold-sensitive phenotype after a temperature shift from 37 to 15°C in comparison to wild type strain MR168. A mutation in the acetolactate synthase complex IlvBH was found to be partially responsible for this growth defect after cold shock. Via DNA sequencing, genetic and biochemical studies, this defect was characterized, which entails a substitution of two adenines to guanines in the ilvB gene. This results in an amino acid substitution from lysine at position 176 to glycine. As a consequence, the acetolactate synthase efficiency in strain JH642 was found to be reduced by 51-fold.

Keywords: Bacillus subtilis; cold shock; JH642; MR168; ilvB; acetolactate synthase

Journal Article.  2968 words.  Illustrated.

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