Characterization of a mutation in the acetolactate synthase of Bacillus subtilis that causes a cold-sensitive phenotype.
The Bacillus subtilis laboratory strain JH642 shows a cold-sensitive phenotype after a temperature shift from 37 to 15 degrees 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.
Wiegeshoff
Frank
F
Philipps-Universität Marburg, FB Chemie, Marburg, Germany.
Marahiel
Mohamed A
MA
D000095:Acetolactate Synthase / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D019943:Amino Acid Substitution / Q000235:genetics*; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D003080:Cold Temperature; D004252:DNA Mutational Analysis; D004269:DNA, Bacterial / Q000235:genetics; D005816:Genetic Complementation Test; D007651:Keto Acids / Q000378:metabolism; D020125:Mutation, Missense; D010641:Phenotype; D017422:Sequence Analysis, DNA
D004269:DNA, Bacterial; D007651:Keto Acids; D000095:Acetolactate Synthase