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Insufficient Expression of the ilv-leu Operon Encoding Enzymes of Branched-Chain Amino Acid Biosynthesis Limits Growth of a Bacillus subtilis ccpA Mutant

Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany

Received 17 April 2002/ Accepted 14 June 2002

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.

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