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Crystallization and preliminary X-ray analysis of human D-dopachrome tautomerase

H Sugimoto1, M Taniguchi, A Nakagawa

  • 1Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan.

Journal of Structural Biology
|November 14, 1997
PubMed

Insights

D-dopachrome tautomerase, structurally similar to macrophage migration inhibitory factor (MIF), has been crystallized. This structural insight aids in understanding its role in inflammation and immune responses.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Immunology

Background:

  • D-dopachrome tautomerase converts D-dopachrome to 5,6-dihydroxyindole.
  • Homology to macrophage migration inhibitory factor (MIF) suggests roles in inflammation and immunity.
  • The reaction mechanisms of D-dopachrome tautomerase and MIF remain unclear.

Purpose of the Study:

  • To determine the tertiary structure of human D-dopachrome tautomerase.
  • To provide insights into the molecular function and reaction mechanisms of D-dopachrome tautomerase and related proteins.
  • To facilitate further studies on the roles of these proteins in biological processes.

Main Methods:

  • Crystallization of human D-dopachrome tautomerase using the hanging-drop vapor diffusion method.
  • X-ray diffraction analysis of crystals to 1.6 A resolution using synchrotron radiation.
  • Successful crystallization of a selenomethionyl derivative for multiwavelength anomalous diffraction (MAD) studies.

Main Results:

  • Human D-dopachrome tautomerase was crystallized in the trigonal space group P3.
  • Unit cell dimensions were determined as a = b = 84.2 A and c = 41.0 A.
  • Crystals diffracted X-rays to a resolution of 1.6 A.

Conclusions:

  • The crystal structure of D-dopachrome tautomerase provides a foundation for understanding its enzymatic activity.
  • Structural data will aid in elucidating the protein's function in inflammatory and immunological pathways.
  • Further structural and functional studies are warranted to fully understand its biological significance.

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