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Related Experiment Video

Updated: Apr 19, 2026

Isolation and Characterization of the Murine Uterosacral Ligaments and Pelvic Floor Organs
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Solution structure, aggregation behavior, and flexibility of human relaxin-2.

Linda M Haugaard-Kedström1, Mohammed Akhter Hossain, Norelle L Daly2

  • 1□School of Natural Sciences, Linnaeus University, SE-391 82 Kalmar, Sweden.

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Human H2 relaxin, a hormone involved in pregnancy and cancer, can function as a monomer. This finding indicates that dimerization is not essential for its biological activity at the relaxin receptor RXFP1.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Relaxin is a pleiotropic peptide hormone with a two-chain structure stabilized by disulfide bonds.
  • It plays roles in collagen regulation, cardiovascular function, tissue remodeling during pregnancy, and cancer.
  • Human H2 relaxin (H2) forms dimers, but the functional significance of this dimerization is unclear.

Purpose of the Study:

  • To determine the NMR structure of a monomeric, amidated form of H2 relaxin.
  • To compare the structural and functional properties of monomeric H2 relaxin with native H2 relaxin.
  • To investigate the role of dimerization in H2 relaxin's biological activity.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine the structure of monomeric H2 relaxin.
  • Biochemical assays to assess the activity of H2 relaxin amide at the relaxin receptor RXFP1.
  • Analysis of NMR chemical shifts and relaxation parameters to study internal molecular motion.

Main Results:

  • The monomeric, amidated form of H2 relaxin retains the overall structure of native H2 relaxin.
  • H2 relaxin amide is fully active at the relaxin receptor RXFP1, demonstrating that dimerization is not required for its biological function.
  • NMR analysis revealed internal motions in H2 relaxin on pico-nanosecond and milli-microsecond timescales, consistent with other related peptides.

Conclusions:

  • Dimerization is not essential for the biological activity of H2 relaxin at RXFP1.
  • The monomeric form of H2 relaxin is structurally stable and functionally active.
  • Internal molecular dynamics may be important for the function of H2 relaxin and related peptide hormones.