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Structure of jack bean chitinase.

M Hahn1, M Hennig, B Schlesier

  • 1Institut für Biochemie, Charité, Humboldt-Universität, Monbijoustrasse 2, 10117 Berlin, Germany. michael.hahn@charite.de

Acta Crystallographica. Section D, Biological Crystallography
|August 25, 2000
PubMed
Summary

The jack bean chitinase structure reveals an alpha-helical protein with a unique active site. This enzyme likely cleaves substrates in a single step, differing from lysozymes.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Chitinases are enzymes that degrade chitin, a crucial polysaccharide in fungal cell walls and arthropod exoskeletons.
  • Understanding chitinase structure and mechanism is vital for developing antifungal agents and pest control strategies.
  • Jack bean chitinase is a model system for studying plant chitinases.

Purpose of the Study:

  • To determine the high-resolution three-dimensional structure of jack bean chitinase.
  • To elucidate the catalytic mechanism of jack bean chitinase.
  • To compare the active site architecture with related enzymes like lysozymes.

Main Methods:

  • X-ray crystallography at 1.8 A resolution.
  • Molecular replacement for structure determination.

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  • Structural analysis and molecular modeling.

    • Main Results:

    • The solved structure reveals an alpha-helical protein fold with three disulfide bridges.
    • The active site shares structural similarities with animal and viral lysozymes.
    • The active site architecture suggests a novel single-step catalytic mechanism involving Glu68, Glu90, and a recruited water molecule.

    Conclusions:

    • Jack bean chitinase employs a distinct catalytic mechanism compared to lysozymes, featuring a single-step cleavage.
    • The proposed mechanism involves Glu68 as the proton donor and Glu90 facilitating nucleophilic attack by water.
    • The structural findings provide insights into enzyme-substrate interactions and catalytic strategies in chitin degradation.