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. 1992 Nov 1;89(21):10252–10256. doi: 10.1073/pnas.89.21.10252

A periplasmic protein disulfide oxidoreductase is required for transformation of Haemophilus influenzae Rd.

J F Tomb 1
PMCID: PMC50316  PMID: 1438213

Abstract

The mutated gene in JG16, a Haemophilus influenzae strain deficient in competence-induced DNA binding and uptake, was cloned and the wild-type allele was sequenced. The gene was shown by Northern analysis to be constitutively expressed on a 1.7-kilobase transcript. The gene product was identified as a 20.6-kDa protein targeted to the periplasm. The protein contains the sequence Cys-Pro-His-Cys (CPHC) and is highly similar to two other periplasmic CPHC motif-containing proteins: DsbA, an Escherichia coli protein (45% identity, 87% homology) and TcpG, a Vibrio cholerae protein (32% identity, 74% homology). Both DsbA and TcpG promote disulfide bond formation in periplasmic proteins, are required for pilus biogenesis, and, like thioredoxin, are capable of reducing insulin in vitro. The Haemophilus protein was shown to complement an E. coli mutation in DsbA and was named Por (periplasmic oxidoreductase). In JG16 the competence-dependent redistribution of inner membrane proteins did not occur. These findings suggest that Por is required for the correct assembly and/or folding of one or more disulfide-containing cell envelope protein involved either in competence development or in the DNA-binding and -uptake machinery.

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Selected References

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