E. Kuster-schock et al., Mutations in catabolite control protein CcpA showing glucose-independent regulation in Bacillus megaterium, J BACT, 181(24), 1999, pp. 7634-7638
We identified five single amino acid exchanges in CcpA that lead to permane
nt repression of the xylose utilization genes in the absence of glucose, Ot
her proteins from the CcpA regulon also show glucose-independent regulation
in the mutants, The mutant CcpA proteins bind to the DNA target catabolite
responsive elements without the corepressor HPr-Ser-P.