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Related Experiment Videos

Crystallization of prostatic binding protein.

J S Punzi1, D Ghosh, C M Weeks

  • 1Medical Foundation of Buffalo, Inc., NY 14203.

Journal of Steroid Biochemistry
|October 1, 1988
PubMed
Summary
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Researchers purified and crystallized prostatic binding protein, a steroid-binding glycoprotein from rat prostate cytosol. X-ray diffraction revealed hexagonal crystals suitable for structural analysis, providing insights into this key protein.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Prostatic binding protein (PBP) is a dimeric glycoprotein found in rat prostate cytosol.
  • PBP exhibits the ability to bind various steroid molecules.
  • Its abundance allows for the purification of milligram quantities.

Purpose of the Study:

  • To obtain high-quality crystals of prostatic binding protein for X-ray diffraction analysis.
  • To characterize the crystallographic properties of PBP.

Main Methods:

  • Purification of milligram quantities of PBP from rat prostate cytosol.
  • Crystal growth using vapor diffusion methods in a phosphate-buffered ammonium sulfate solution.
  • X-ray diffraction analysis of the obtained crystals.

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Main Results:

  • Hexagonal crystals of X-ray diffraction quality were successfully grown.
  • The crystals are stable to X-rays and diffract to 6.3 A resolution.
  • Crystals belong to space group P6(1) or P6(1)22 (or enantiomorphs) with specific unit cell dimensions and molecular content.

Conclusions:

  • Prostatic binding protein can be crystallized to a quality suitable for detailed structural studies.
  • The crystallographic data provide a foundation for determining the three-dimensional structure of PBP.
  • Understanding PBP structure may elucidate its role in steroid binding and prostate function.