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Related Experiment Videos

Identification of genes encoding microbial glucuronoyl esterases.

Xin-Liang Li1, Silvia Spániková, Ronald P de Vries

  • 1National Center for Agricultural Utilization Research, USDA-ARS, Peoria, IL 61604, USA.

FEBS Letters
|August 7, 2007
PubMed
Summary
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Researchers identified a glucuronoyl esterase enzyme crucial for breaking down plant cell walls. This enzyme, found in fungi, can be produced using genetic engineering, paving the way for biomass breakdown applications.

Area of Science:

  • Biochemistry
  • Plant Biology
  • Enzymology

Background:

  • Plant cell walls contain ester linkages connecting lignin and hemicellulose.
  • Glucuronoxylan's 4-O-methyl-D-glucuronic acid links to lignin alcohols via ester bonds.
  • The wood-rotting fungus Schizophyllum commune possesses a glucuronoyl esterase.

Purpose of the Study:

  • To identify and characterize the glucuronoyl esterase enzyme.
  • To find homologous genes encoding this enzyme in other organisms.
  • To confirm the enzyme's activity through gene expression and purification.

Main Methods:

  • Partial amino acid sequencing of glucuronoyl esterase.
  • Bioinformatic search for homologous genes in fungal and bacterial genomes.
  • Over-expression of the homologous cip2 gene in Hypocrea jecorina (Trichoderma reesei).

Related Experiment Videos

  • Purification of the expressed protein and enzymatic activity assay.

    • Main Results:

    • Partial enzyme sequences were obtained.
    • Homologous genes were identified in several filamentous fungi and one bacterium.
    • The cip2 gene from H. jecorina was successfully over-expressed.
    • The purified product of the cip2 gene demonstrated glucuronoyl esterase activity.

    Conclusions:

    • The cip2 gene in H. jecorina encodes a functional glucuronoyl esterase.
    • This enzyme plays a role in breaking down plant cell wall components.
    • The discovery has implications for biomass deconstruction and biofuel production.