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Yeast exoglucanases. Where redundancy implies necessity

G Larriba1, R D Basco, E Andaluz

  • 1Departamento de Microbiología, Facultad de Ciencias, Universidad de Extremaaura, Badajoz, Spain.

Archives of Medical Research
|January 1, 1993
PubMed
Summary

Saccharomyces cerevisiae has three exoglucanase genes. EXG1 encodes the main exoglucanase, which is modified and secreted, while EXG2 and SSG encode other forms with distinct roles.

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Area of Science:

  • * Molecular biology
  • * Yeast genetics
  • * Glycobiology

Background:

  • * Exoglucanases are crucial enzymes in yeast cell wall synthesis and remodeling.
  • * Saccharomyces cerevisiae possesses multiple exoglucanase genes with varying roles and characteristics.

Purpose of the Study:

  • * To detail the characteristics of three exoglucanase genes (EXG1, EXG2, SSG) in Saccharomyces cerevisiae.
  • * To compare S. cerevisiae exoglucanases with their counterparts in Candida albicans.
  • * To investigate the functional significance of these conserved enzymes.

Main Methods:

  • * Gene expression analysis
  • * Protein characterization (glycosylation, cleavage)
  • * Comparative genomics

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Main Results:

  • * EXG1 gene product is differentially glycosylated into three isoenzymes (EXOI, EXOII, EXOII1/2) and processed by Kex2 protease.
  • * EXG2 encodes a membrane-bound glycoprotein, and SSG is involved in sporulation.
  • * Conserved regions exist between S. cerevisiae and C. albicans exoglucanases.

Conclusions:

  • * S. cerevisiae exhibits diverse exoglucanase systems with distinct post-translational modifications and cellular localization.
  • * Functional studies of these conserved yeast exoglucanases remain inconclusive, warranting further investigation.