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. 1967 Dec;94(6):1934–1945. doi: 10.1128/jb.94.6.1934-1945.1967

Release of Surface Enzymes in Enterobacteriaceae by Osmotic Shock

Harold C Neu a,1, James Chou a
PMCID: PMC276925  PMID: 4294595

Abstract

The process of osmotic shock, which has been used to release degradative enzymes from Escherichia coli, can be applied successfully to other members of the Enterobacteriaceae. Cyclic phosphodiesterase (3′-nucleotidase), 5′-nucleotidase (diphosphate sugar hydrolase), acid hexose phosphatase, and acid phenyl phosphatase are released from Shigella, Enterobacter, Citrobacter, and Serratia strains. Some strains of Salmonella also release these enzymes. Members of Proteus and Providencia groups fail to release enzymes when subjected to osmotic shock and do not show a lag in regrowth, although they do release their acid-soluble nucleotide pools. In contrast to E. coli, release of enzymes from other members of the Enterobacteriaceae studied is affected by growth conditions and strain of organism. None of the organisms was as stable to osmotic shock in exponential phase of growth as was E. coli. Exponential-phase cells of Shigella, Enterobacter, and Citrobacter could be shocked only with 0.5 mm MgCl2 to prevent irreparable damage to the cells. These observations suggest that this group of degradative enzymes is probably loosely bound to the cytoplasmic membrane through the mediation of divalent cations.

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1936

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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