Identification of the CadBA Operon from Vibrio Vulnificus and Its Influence on Survival to Acid Stress

Overview

Journal FEMS Microbiol Lett

Publisher Oxford University Press

Specialty Microbiology

Date 2002 Apr 18

PMID 11959444

Citations 25

Authors

Jee Eun Rhee

Joon Haeng Rhee

Phil Youl Ryu

Sang Ho Choi

Affiliations

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Abstract

By a transposon-tagging method, cadBA genes encoding a lysine/cadaverin antiporter and a lysine decarboxylase were identified and cloned from Vibrio vulnificus. The deduced amino acid sequences of cadBA were 64-97% similar to those reported from other Enterobacteriaceae. Functions of cadBA genes on acid tolerance were assessed by comparing acid tolerances of V. vulnificus and its isogenic mutants, whose cadBA genes were separately inactivated by allelic exchanges. The results demonstrated that gene products of cadBA contribute to acid tolerance of V. vulnificus, and that their contribution is dependent on prior exposure of cells to moderately acidic pH.

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