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Gellan lyases--novel polysaccharide lyases

L Kennedy1, I W Sutherland

  • 1Institute of Cell and Molecular Biology, Edinburgh University, UK.

Microbiology (Reading, England)
|November 1, 1994
PubMed
Summary

Researchers isolated bacterial strains that degrade gellan, a bacterial exopolysaccharide. These strains utilize extracellular lyase enzymes, primarily endoenzymes, to break down gellan and related polysaccharides.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Enzymology

Background:

  • Bacterial exopolysaccharides like gellan are complex carbohydrates with diverse biological roles.
  • The enzymatic degradation of gellan is crucial for understanding microbial interactions and nutrient cycling.
  • Isolation and characterization of gellan-degrading bacteria provide insights into novel enzymatic activities.

Purpose of the Study:

  • To isolate and characterize bacterial strains capable of degrading the bacterial exopolysaccharide gellan.
  • To investigate the enzymatic mechanisms involved in gellan degradation.
  • To determine the substrate specificity of the identified gellan-degrading enzymes.

Main Methods:

  • Standard enrichment culture techniques were employed to isolate gellan-degrading bacteria.
  • Enzyme activity was assessed by monitoring viscosity changes and direct degradation assays.
  • Bacterial isolates were characterized using Gram staining, motility tests, and pigment analysis.

Main Results:

  • Several Gram-negative, non-fermentative, motile, and amylase-producing bacterial strains were isolated.
  • Gellan degradation was attributed to extracellular eliminase-type enzymes (lyases), predominantly endoenzymes.
  • Enzyme activity was inducible and almost absent in glucose-grown cells.
  • Associated intracellular alpha-L-rhamnosidase and beta-D-glucosidase activities were detected in the periplasm of Gram-negative isolates.
  • The enzymes exhibited high specificity, degrading gellan and deacetylated rhamsan but showing limited activity on other related polysaccharides.

Conclusions:

  • Bacterial strains capable of degrading gellan have been successfully isolated and characterized.
  • The degradation is mediated by inducible, extracellular lyases that act primarily as endoenzymes.
  • The identified enzymes display specific activity towards gellan and its deacetylated form, rhamsan gum.
  • Further research into these enzymes could have applications in biotechnology and understanding microbial polysaccharide metabolism.

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