TABLE 5.

Role of the HPr and Crh proteins in catabolite repression of the rocG genea

StrainRelevant genotypeβ-Galactosidase activity (U) in medium containing:
Ornithine and glucoseOrnithine, no glucose
BB1521ccpA191.6191.6
BB2025ptsH17.0
BB2026crh13.1
BB2027ptsH1 crh242.1
  • a Derivatives of strain BB1512 carrying the DAS-rocGp+-lacZ fusion were grown in minimal medium with the indicated carbon and nitrogen sources and assayed for β-galactosidase activity.