Role and regulation of Bacillus subtilis glutamate dehydrogenase genes.
The complete Bacillus subtilis genome contains two genes with the potential to encode glutamate dehydrogenase (GlutDH) enzymes. Mutations in these genes were constructed and characterized. The rocG gene proved to encode a major GlutDH whose synthesis was induced in media containing arginine or ornithine or, to a lesser degree, proline and was repressed by glucose. A rocG null mutant was impaired in utilization of arginine, ornithine, and proline as nitrogen or carbon sources. The gudB gene was expressed under all growth conditions tested but codes for a GlutDH that seemed to be intrinsically inactive. Spontaneous mutations in gudB that removed a 9-bp direct repeat within the wild-type gudB sequence activated the GudB protein and allowed more-efficient utilization of amino acids of the glutamate family.
Belitsky
B R
BR
Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111, USA. bbelit02@tufts.edu
Sonenshein
A L
AL
D000595:Amino Acid Sequence; D001120:Arginine / Q000378:metabolism; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002874:Chromosome Mapping; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D005798:Genes, Bacterial; D005969:Glutamate Dehydrogenase / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D009952:Ornithine / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D017386:Sequence Homology, Amino Acid
D017931:DNA Primers; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012333:RNA, Messenger; D001120:Arginine; D011392:Proline; D009952:Ornithine; D005969:Glutamate Dehydrogenase