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Relaxin.

C Schwabe1, E E Büllesbach

  • 1Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston 29425-2211.

Comparative Biochemistry and Physiology. B, Comparative Biochemistry
|January 1, 1990
PubMed
Summary
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Relaxin, a reproductive hormone, influences birth and sperm function across species. Its structure and biosynthesis resemble insulin but with unique evolutionary divergence.

Area of Science:

  • Reproductive endocrinology
  • Molecular biology
  • Comparative genomics

Background:

  • Relaxin is a key hormone in reproduction, impacting parturition, uterine accommodation, and sperm motility.
  • All relaxins share a conserved two-chain, disulfide-linked insulin-like structure with specific arginine residues.

Purpose of the Study:

  • To elucidate the structural and biosynthetic relationships of relaxin to insulin.
  • To investigate the evolutionary patterns of relaxin primary structures across species.

Main Methods:

  • Comparative analysis of relaxin and insulin structures.
  • Examination of prohormone processing and biosynthetic pathways.
  • Amino acid sequence analysis of relaxins from various species.

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Main Results:

  • Relaxin and insulin share similar biosynthetic pathways, though relaxin prohormone is larger.
  • Active relaxin is formed by cleaving a connecting peptide from its prohormone.
  • Primary structures of relaxins from related species show significant differences, challenging traditional evolutionary models.

Conclusions:

  • Relaxin's unique structural and biosynthetic features highlight its specialized reproductive roles.
  • The significant divergence in relaxin primary structures suggests complex evolutionary pressures.
  • Further research is needed to fully understand relaxin's molecular evolution and its impact on reproductive processes.