| pubmed-article:7706207 | pubmed:abstractText | Mutant grs1 genes were cloned and sequenced from the Bacillus brevis Nagano BI-4, C-3, E-1, and E-2 strains, which produce defective gramicidin S synthetase 1 (GS1), lacking racemase activity. Surprisingly, these mutant genes had entirely the same sequence as that of the wild type gene. These mutant strains also produce defective gramicidin S synthetase 2 (GS2), lacking 4'-phosphopantetheine, a prosthetic group of this enzyme. The participation of this group in phenylalanine racemization is suggested. | lld:pubmed |
