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. 1993 Oct;61(10):4131–4138. doi: 10.1128/iai.61.10.4131-4138.1993

Growth in and breakdown of purified rabbit small intestinal mucin by Yersinia enterocolitica.

M Mantle 1, C Rombough 1
PMCID: PMC281135  PMID: 8406802

Abstract

The mucus lining of the gastrointestinal tract serves as a protective barrier over the epithelial surface that must be crossed by invading bacteria seeking entry into the mucosa. The gel-forming component of mucus is mucin, a large polymeric glycoprotein. The present study examined the growth of Yersinia enterocolitica (with and without its virulence plasmid) in purified rabbit small intestinal mucin and the ability of bacteria to degrade mucin. Both virulent and nonvirulent organisms showed enhanced growth in mucin-supplemented media compared with unsupplemented media, but only at 37 degrees C and not at 25 degrees C. The effects of mucin were not specific because medium supplemented with bovine serum albumin also enhanced bacterial growth at 37 degrees C. Purified mucin was broken down into lower-molecular-weight components (assessed by monitoring its elution profile on a Sepharose CL-2B column) by plasmid-bearing Y. enterocolitica but not by plasmid-cured organisms. Culturing virulent Y. enterocolitica at 25 degrees C completely suppressed its capacity to degrade mucin, suggesting that this activity depends on plasmid expression. These results were confirmed in similar studies with purified rabbit colonic mucin. Mucin-degrading activity could be demonstrated in spent culture media from virulent Y. enterocolitica incubated at 37 degrees C but not in bacterial membrane preparations. Changes in the elution profiles of small intestinal and colonic mucins exposed to plasmid-bearing Y. enterocolitica at 37 degrees C were consistent with proteolytic depolymerization. The ability to grow well in mucin may help Y. enterocolitica to colonize the intestine, while the production of a mucin-degrading enzyme(s) by plasmid-bearing organisms may assist pathogenic strains to solubilize and penetrate the mucus gel layer.

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Selected References

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