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Peptide-based Identification of Functional Motifs and their Binding Partners
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Peptide-based Identification of Functional Motifs and their Binding Partners

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Two N-terminally truncated forms of C-type natriuretic peptide from habu snake venom

G H Michel1, N Murayama, T Sada

  • 1School of Pharmaceutical Sciences, Showa University, Hatanodai, Shinagawa-ku, 142-8555, Tokyo, Japan.

Peptides
|July 6, 2000
PubMed

Insights

Researchers discovered two shorter forms of C-type natriuretic peptide (CNP) in habu snake venom. One form, Tf-CNP(6-22), is the shortest natural CNP and shows potent vasorelaxant and diuretic effects.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Herpetology

Background:

  • C-type natriuretic peptide (CNP) plays crucial roles in cardiovascular and renal functions.
  • Snake venom is a rich source of biologically active peptides with therapeutic potential.

Purpose of the Study:

  • To isolate and characterize novel CNP variants from Trimeresurus flavoviridis (habu snake) venom.
  • To investigate the biological activities of these novel CNP forms.

Main Methods:

  • Isolation of peptides from habu snake venom.
  • Structural determination using Electrospray Ionization Mass Spectrometry (ESI-MS) and amino acid sequencing.
  • Assessment of vasorelaxant activity in rat aortic strips.
  • Evaluation of diuretic potency in anesthetized rats.

Main Results:

  • Two N-terminally truncated CNP forms were identified: Tf-CNP(6-22) and Tf-CNP(3-22).
  • Tf-CNP(6-22), a 17-amino acid peptide with a disulfide bridge, exhibited significant vasorelaxant and diuretic activities.
  • Tf-CNP(6-22) is the shortest naturally occurring CNP identified to date and demonstrated potency comparable to the full-length CNP (Tf-CNP(1-22)).

Conclusions:

  • Novel, truncated CNP variants exist in habu snake venom.
  • The minimal 17-residue ring structure of CNP is sufficient for potent biological activity.
  • These findings expand our understanding of CNP diversity and function, with potential implications for drug discovery.

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