Isolation and structure of another hypothalamic peptide possessing MSH-release-inhibiting activity

R. M.G. Nair, Abba J. Kastin, Andrew V. Schally

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


A second peptide with the biological activity of an MSH-release-inhibiting factor (MIF) and with the amino acid composition His 1, Arg 1, Pro 1, Gly 1, Phe 1 was isolated from bovine hypothalami. This pentapeptide, when subjected to the combined Edman-dansyl degradation, yielded the sequence Pro-His-Phe-Arg-Gly-NH2, which was confirmed by derivatisation and mass spectral fragmentation. A peptide of similar structure was then synthesized. The chromagraphic and electrophoretic mobilities, biological activities, and mass spectral fragmentation patterns of the synthetic and natural peptides were compared and found to be similar. These studies suggest the existence of a hypothalamic pentapeptide, H-Pro-His-Phe-Arg-Gly-NH2, possessing MIF-activity.

Original languageEnglish (US)
Pages (from-to)1420-1425
Number of pages6
JournalBiochemical and biophysical research communications
Issue number6
StatePublished - Jun 28 1972
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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