RPOS-DEPENDENT EXPRESSION OF THE 2ND LYSINE DECARBOXYLASE GENE IN ESCHERICHIA-COLI

The second lysine decarboxylase gene (ldc) is at 4.7 min on the Escher ichia coli chromosome [Kikuchi et al., J. Baceriol. 179, 4486-4492 (19 97)]. This report showes that the expression of Ide as well as cadA wa s induced at stationary phase in the wild type of E. coli. The Ide was not expressed in a rpoS deletion mutant of E. coli at any growing sta ge. In contrast, cadA was expressed in the rpoS mutant. Thus, we concl ude that the expression of Ide but not cadA at stationary phase is reg ulated by a RpoS-dependent mechanism (s) in E. coli.