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Laccases from Aureobasidium pullulans.

Joseph O Rich1, Timothy D Leathers, Amber M Anderson

  • 1Renewable Product Technology Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA. joseph.rich@ars.usda.gov

Enzyme and Microbial Technology
|May 21, 2013
PubMed
Summary
This summary is machine-generated.

This study explored laccase enzymes in Aureobasidium pullulans, finding they differ from lignin-degrading types and link to pigment production. These fungal laccases show unique properties and varying molecular weights.

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Area of Science:

  • Enzymology
  • Mycology
  • Biochemistry

Background:

  • Laccases (polyphenol oxidases, EC 1.10.3.2) are versatile enzymes with industrial and bioremediation uses.
  • While known for lignin degradation, laccases have diverse fungal roles beyond this primary function.
  • Fungal pigment production is often linked to enzymatic activity, suggesting potential novel enzyme functions.

Purpose of the Study:

  • To investigate laccase production in 41 strains of the fungus Aureobasidium pullulans.
  • To characterize the properties of laccases produced by A. pullulans and compare them to known lignin-degrading enzymes.
  • To explore the relationship between laccase activity, pigment production, and phylogenetic clades within A. pullulans.

Main Methods:

  • Screening of 41 Aureobasidium pullulans strains for laccase activity.
  • Biochemical characterization of laccases, including temperature optima and stability assays.
  • Enzyme purification and molecular weight determination using Endo H treatment.
  • Phylogenetic analysis to correlate laccase properties with fungal clades and pigment phenotypes.

Main Results:

  • Laccase production was detected in A. pullulans strains, with distinct properties compared to lignin-degrading fungi.
  • Laccases from clade 5 strains, producing a vinaceous pigment, showed optimal activity at 50-60°C and stability at 50°C.
  • Purified laccases from A. pullulans NRRL 50381 (clade 5) and NRRL Y-2568 exhibited different molecular weights (60-70kDa and >100kDa, respectively) after glycosylation modification.
  • Laccase activity was associated with pigment production, specifically dark vinaceous and olivaceous colors.

Conclusions:

  • Aureobasidium pullulans produces laccases with unique biochemical characteristics distinct from typical lignin-degrading enzymes.
  • Fungal laccase activity in A. pullulans is linked to pigment biosynthesis, suggesting novel enzymatic roles.
  • The characterized laccases from A. pullulans represent promising candidates for biotechnological applications due to their specific properties and glycosylation patterns.