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Related Experiment Videos

Lignin peroxidase structure and function.

K Piontek1, A T Smith, W Blodig

  • 1Institute of Biochemistry, ETH-Zürich, Universitätstrasse 16, CH-8092 Zürich, Switzerland. klaus.piontek@bc.biol.ethz.ch

Biochemical Society Transactions
|May 18, 2001
PubMed
Summary
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Lignin peroxidase (LiP) utilizes a modified Trp171 residue for efficient lignin biodegradation. This modification is crucial for electron transfer and activity with natural substrates.

Area of Science:

  • Biochemistry
  • Enzymology
  • Plant Science

Background:

  • Lignin peroxidase (LiP) is key in degrading lignin, a major plant cell wall component.
  • LiP's redox mechanism, particularly electron transfer, is not fully understood.
  • A unique modification on Trp171 in LiP prompted further investigation.

Purpose of the Study:

  • To elucidate the role of the modified Trp171 residue in LiP's catalytic mechanism.
  • To investigate the involvement of Trp171 in electron transfer and substrate oxidation.
  • To understand the structural and functional consequences of Trp171 modification.

Main Methods:

  • Crystallography
  • Site-directed mutagenesis
  • Protein chemistry

Related Experiment Videos

  • Spin-trapping
  • Spectroscopy
  • Peptide mapping

    • Main Results:

    • Trp171 undergoes stereospecific hydroxylation at the Cbeta-atom via an auto-catalytic process during turnover with hydrogen peroxide.
    • Evidence suggests the formation of a Trp171 radical intermediate.
    • Trp171 is likely involved in long-range electron transfer (LRET) from substrates to the heme cofactor.
    • Mutating Trp171 eliminated oxidation activity for veratryl alcohol but not artificial substrates.
    • Mutations caused minimal structural changes, indicating the loss of activity is due to the absence of the redox-active indole side chain.

    Conclusions:

    • The Cbeta-hydroxylated Trp171 residue is essential for LiP's activity with natural substrates like veratryl alcohol.
    • Trp171 plays a critical role in the electron transfer pathway, likely via LRET.
    • The unique modification of Trp171 is a key feature for LiP's function in lignin biodegradation.