Insufficient expression of the ilv-leu operon encoding enzymes of branched-chain amino acid biosynthesis limits growth of a Bacillus subtilis ccpA mutant.
Bacillus subtilis ccpA mutant strains exhibit two distinct phenotypes: they are defective in catabolite repression, and their growth on minimal media is strongly impaired. This growth defect is largely due to a lack of expression of the gltAB operon. However, growth is impaired even in the presence of glutamate. Here, we demonstrate that the ccpA mutant strain needs methionine and the branched-chain amino acids for optimal growth. The control of expression of the ilv-leu operon by CcpA provides a novel regulatory link between carbon and amino acid metabolism.
Ludwig
Holger
H
Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany.
Meinken
Christoph
C
Matin
Anastasija
A
Stülke
Jörg
J
D000597:Amino Acids, Branched-Chain / Q000096:biosynthesis* / Q000235:genetics; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D001426:Bacterial Proteins; D003470:Culture Media; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005947:Glucose / Q000378:metabolism; D005970:Glutamate Synthase / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D009876:Operon / Q000235:genetics / Q000502:physiology*; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic; D014994:Xylose / Q000378:metabolism
D000597:Amino Acids, Branched-Chain; D001426:Bacterial Proteins; D003470:Culture Media; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; C069286:catabolite control proteins, bacteria; D014994:Xylose; D005970:Glutamate Synthase; D005947:Glucose