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Preliminary crystallographic studies on human complement pro-factor D

S V Narayana1, Y Yamauchi, K J Macon

  • 1Center for Macromolecular Crystallography, University of Alabama at Birmingham 25294.

Journal of Molecular Biology
|January 21, 1994
PubMed
Summary
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Crystallization of recombinant human complement factor D zymogen was achieved using polyethylene glycol 6000. The resulting crystals are stable and suitable for X-ray diffraction analysis, enabling structural studies.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Crystallography

Background:

  • The human complement system is crucial for innate immunity.
  • Factor D is a key serine protease in the complement cascade.
  • Understanding Factor D structure is vital for therapeutic development.

Purpose of the Study:

  • To crystallize the recombinant zymogen of human complement factor D.
  • To obtain crystals suitable for X-ray diffraction.
  • To facilitate structural determination of Factor D.

Main Methods:

  • Recombinant expression of human complement factor D zymogen.
  • Crystallization by vapor diffusion using polyethylene glycol 6000.
  • Characterization of crystal forms, space group, and diffraction properties.

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Main Results:

  • Two crystal forms of human complement factor D zymogen were obtained at pH 5.4.
  • Crystals belong to space group P2(1).
  • Diffraction data to 2.4 A resolution was achieved with stable crystals.

Conclusions:

  • Successful crystallization of recombinant human complement factor D zymogen.
  • Established conditions for obtaining diffraction-quality crystals.
  • Provides a foundation for future structural studies of Factor D.