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Related Experiment Videos

Crystal versus solution structures of thiamine diphosphate-dependent enzymes.

D I Svergun1, M V Petoukhov, M H Koch

  • 1European Molecular Biology Laboratory, Hamburg Outstation, Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22603 Hamburg, Germany. Svergun@EMBL-Hamburg.DE

The Journal of Biological Chemistry
|January 5, 2000
PubMed
Summary

Synchrotron X-ray scattering revealed that enzyme quaternary structures in solution differ from crystal structures. Enzyme subunit arrangements adjust, especially those with looser crystal contacts, correlating with interfacial areas.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Thiamine diphosphate-dependent enzymes are crucial in metabolic pathways.
  • Understanding enzyme quaternary structure in solution is vital for function.
  • Crystallographic models provide high-resolution static structures, but solution states may differ.

Purpose of the Study:

  • To investigate the quaternary structures of key thiamine diphosphate-dependent enzymes in solution.
  • To compare solution structures with existing crystallographic models.
  • To determine how crystal packing affects enzyme quaternary structure.

Main Methods:

  • Synchrotron X-ray solution scattering (SAXS) was employed to study enzyme structures in solution.
  • Experimental scattering data were compared to theoretical curves from crystallographic models.

Related Experiment Videos

  • Rigid body refinement was used to model subunit rearrangements in solution.

    • Main Results:

    • Significant differences were observed between solution and crystal structures for transketolase, pyruvate oxidase, and yeast pyruvate decarboxylase.
    • Pyruvate decarboxylase from Z. mobilis showed minimal deviation, indicating a compact structure.
    • Enzymes with looser inter-subunit contacts in crystals required larger structural modifications in solution.

    Conclusions:

    • Enzyme quaternary structures in solution can differ substantially from their crystal forms.
    • Crystal packing forces can induce significant distortions in enzyme structures.
    • The interfacial area between subunits correlates with the degree of structural distortion observed in solution.