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. 1977 Oct;6(4):379–386. doi: 10.1128/jcm.6.4.379-386.1977

Enzymatic Degradation of Polygalacturonic Acid by Yersinia and Klebsiella Species in Relation to Clinical Laboratory Procedures

Mortimer P Starr 1, Arun K Chatterjee 1, Phoebe B Starr 1, Gordon E Buchanan 1
PMCID: PMC274778  PMID: 334794

Abstract

As scored by several specified plating procedures, clinical and environmental strains of Yersinia enterocolitica, Yersinia pseudotuberculosis, and Klebsiella pneumoniae “Oxytocum” showed detectable, albeit generally weak, ability to digest polygalacturonic (pectic) acid. None of these bacterial strains had the vigorous and rapid pectolytic activity on these polygalacturonic acid-containing media that is typical of soft-rot Erwinia species, although some of the Oxytocum strains came fairly close. Analyses of the pectolytic enzyme contents of the cells and culture supernatants of the Yersinia and Klebsiella species revealed that readily detectable quantities of cell-bound polygalacturonic acid trans-eliminase and hydrolytic polygalacturonase were formed by the Yersinia and Klebsiella species; however, the total units of enzyme activity produced by these bacteria were, in general, lower than were produced by soft-rot Erwinia species. Furthermore, unlike the situation in soft-rot Erwinia cultures, these pectolytic enzymes of Yersinia and Klebsiella species were not excreted rapidly and massively into the growth medium. Cultures of other enterobacteria (Citrobacter species, Enterobacter species, Erwinia amylovora, Erwinia herbicola, Escherichia coli, Proteus species, Salmonella typhimurium, and Serratia marcescens) showed no pectolytic ability whatsoever by any of the plating procedures used and (to the extent they were so examined) produced no pectolytic enzymes detectable either in their cells or culture supernatants. This slow or weak release of pectolytic enzymes by Yersinia and Klebsiella species has a bearing on clinical laboratory procedures suitable for detecting their pectolytic activity; methods adequate for this purpose are detailed.

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Selected References

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

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