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Infect Immun. Jan 1995; 63(1): 206–211.
PMCID: PMC172979

Molecular and biochemical characterization of a protective 40-kilodalton antigen from Corynebacterium pseudotuberculosis.

Abstract

A 40-kDa protein from Corynebacterium pseudotuberculosis has been previously identified as a protective antigen against ovine caseous lymphadenitis. From genomic DNA libraries of C. pseudotuberculosis, we have cloned and sequenced the 40-kDa protein gene, which was found to contain an open reading frame of 1,137 bp encoding a protein of 379 amino acids. No significant homology with previously published DNA or amino acid sequence data was found in databases, suggesting that this is a novel protein. Recombinant 40-kDa protein was overexpressed as a fusion protein to 15% of total cell proteins in Escherichia coli. Biochemical analysis of native and recombinant 40-kDa proteins has revealed associated proteolytic activity, which was shown to be of the serine protease type through the use of specific inhibitors. We suggest that this novel protective antigen be termed corynebacterial protease 40 (CP40).

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Selected References

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