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Characterization of the 48.5 kDa chorionic gonadotropin-like protein from Xanthomonas maltophilia

S Grover1, W D Odell

  • 1Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City.

Endocrine Research
|January 1, 1993
PubMed

Insights

Researchers isolated a bacterial protein, xCG, from Xanthomonas maltophilia that cross-reacts with human chorionic gonadotropin (hCG) beta-subunit. Further characterization and an immunoassay for xCG were developed.

Area of Science:

  • Microbiology
  • Immunology
  • Biochemistry

Background:

  • A 48.5 kDa membrane protein from Xanthomonas maltophilia (ATCC 13637) was previously identified.
  • This protein showed immunological cross-reactivity with the beta-subunit of human chorionic gonadotropin (hCG).
  • No cross-reactivity was observed with human luteinizing hormone (LH), thyroid-stimulating hormone (TSH), or the free alpha subunit of hCG.

Purpose of the Study:

  • To improve the purification of the bacterial protein.
  • To characterize the purified protein (xCG) using radioimmunoassays (RIAs).
  • To determine the amino acid composition and partial sequence of xCG and compare its homology to hCG.

Main Methods:

  • Improved protein purification techniques for Xanthomonas maltophilia.
  • Characterization of the purified bacterial protein (xCG) using radioimmunoassays (RIAs).
  • Amino acid composition analysis and partial protein sequencing.
  • Development of a specific RIA for the bacterial protein xCG.

Main Results:

  • A highly purified bacterial protein, designated xCG, was obtained.
  • xCG demonstrated specific immunological cross-reactivity with the beta-subunit of hCG in RIAs.
  • Amino acid composition and partial sequence data were acquired, allowing for homology comparison with hCG.
  • A specific RIA for xCG was successfully developed.

Conclusions:

  • The bacterial protein xCG shares immunological and sequence similarities with the beta-subunit of hCG.
  • The developed RIA for xCG provides a tool for its detection and further study.
  • This research contributes to understanding interspecies protein homology and potential applications in diagnostics.

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