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. 1988 Aug;170(8):3537–3542. doi: 10.1128/jb.170.8.3537-3542.1988

Isolation and characterization of mutants of a marine Vibrio strain that are defective in production of extracellular proteins.

A Ichige 1, K Oishi 1, S Mizushima 1
PMCID: PMC211325  PMID: 2457013

Abstract

A marine Vibrio strain, Vibrio sp. strain 60, produces several extracellular proteins, including protease, amylase, DNase, and hemagglutinin. Mutants of Vibrio sp. strain 60 (epr mutants) pleiotropically defective in production of these extracellular proteins were isolated. They fell into two classes, A and B. In class A, no protease activity was detected in the cells either, whereas in class B, considerable protease activity was detected in the cells. Gel electrophoretic analysis revealed that the protease detected in class B mutant cells was similar to the protease excreted by the parent strain. In addition, the protease in class B mutant cells was found to be localized in the periplasmic space. These results suggest that the passage of the protease through the outer membrane is blocked in class B mutants. Comparison of membrane protein profiles by polyacrylamide gel electrophoresis revealed that all the epr mutants contained an increased amount of a 94,000-Mr protein that may be an outer membrane protein. Four epr mutations were mapped in two different regions of the Vibrio chromosome by transduction; two class A mutations and one class B mutation were located close to each other, whereas another class B mutation was located in a different region of the chromosome.

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Selected References

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