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. 1984 Jul;3(7):1587–1593. doi: 10.1002/j.1460-2075.1984.tb02015.x

Molecular cloning, sequencing, and expression of the crr gene: the structural gene for IIIGlc of the bacterial PEP:glucose phosphotransferase system.

S O Nelson, A R Schuitema, R Benne, L H van der Ploeg, J S Plijter, F Aan, P W Postma
PMCID: PMC557563  PMID: 6086327

Abstract

The phosphoenolpyruvate:glucose phosphotransferase system (PTS) of Salmonella typhimurium is involved both in glucose transport and in the regulation and synthesis of adenylate cyclase and several transport systems. The crr gene has been implicated in this regulating mechanism. A 9.6-kb segment of the S. typhimurium chromosome containing the crr gene was cloned in pAT153. The cloned fragment also complemented cysA mutations but did not contain a functional pts operon which is closely linked to the crr gene and codes for two enzymes of the PTS. Although cysA and crr have been reported to be located on opposite sides of ptsHI, our results suggest that the correct gene order is cysK-ptsHI-crr-cysA. Expression of crr plasmids in a maxicell system yielded two proteins which reacted with specific anti-serum against IIIGlc. The apparent mol. wts. in SDS-polyacrylamide gels were 20 000 and 21 000, the former corresponding to the major band of purified IIIGlc. Both forms were also observed in bacterial extracts and purified IIIGlc. The crr gene was localized on a 1-kb EcoRI-EcoRV fragment of the 9.6-kb insert and sequenced. It codes for a single protein (18 556 D) containing 169 amino acid residues and identified as IIIGlc.

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