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Related Experiment Video

Updated: Feb 18, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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Reduced Processivity in a Chitobiohydrolase Enhances LPMO-Assisted Chitin Depolymerization.

Amanda K Votvik1, Zarah Forsberg1, Alfonso Gautieri2

  • 1Faculty of Chemistry, Biotechnology, and Food Science, The Norwegian University of Life Sciences (NMBU), 1432 Ås, Norway.

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Summary

Engineered glycoside hydrolases (GHs) with reduced processivity, when combined with lytic polysaccharide monooxygenases (LPMOs), significantly enhance the enzymatic breakdown of recalcitrant polysaccharides like chitin and cellulose.

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Area of Science:

  • Biochemistry and Enzymology
  • Protein Engineering
  • Biotechnology

Background:

  • Efficient depolymerization of recalcitrant polysaccharides (chitin, cellulose) requires processive glycoside hydrolases (GHs) and lytic polysaccharide monooxygenases (LPMOs).
  • Processive GHs exhibit slow dissociation (low k_off), limiting turnover despite aiding crystalline substrate degradation.
  • Understanding the interplay between GH processivity and LPMO activity is crucial for optimizing enzymatic polysaccharide conversion.

Purpose of the Study:

  • To engineer variants of the exochitobiohydrolase *Sm*ChiB with reduced substrate affinity and processivity.
  • To investigate the impact of decreased processivity on enzyme performance, particularly in synergy with LPMOs.
  • To elucidate how modulating GH processivity can enhance enzymatic conversion of recalcitrant polysaccharides.

Main Methods:

  • Site-directed mutagenesis of *Sm*ChiB, replacing Trp220 with Tyr, Phe, His, Gln, or Ala.
  • Functional analysis of mutant enzymes to determine substrate affinity and processivity (k_off).
  • Molecular dynamics simulations to assess the role of Trp220 in substrate binding.
  • Enzymatic assays combining engineered GH variants with LPMOs on polysaccharide substrates.

Main Results:

  • Mutants showed stepwise reductions in substrate affinity and processivity, indicating increased k_off.
  • Less processive mutants (*Sm*ChiB W220Y) achieved wild-type performance only at high substrate concentrations.
  • LPMO-assisted substrate decrystallization significantly enhanced the performance of less processive mutants compared to wild-type GH.
  • The W220Y mutant combined with an LPMO yielded twice the soluble product versus wild-type *Sm*ChiB under identical conditions.

Conclusions:

  • Reduced GH processivity, when coupled with LPMOs, leads to more efficient enzymatic depolymerization of noncrystalline polysaccharides.
  • Less processive GHs are advantageous when LPMOs increase substrate accessibility and effective concentration.
  • These findings provide a strategy for optimizing GH-LPMO synergy for industrial applications in polysaccharide conversion.