Calmodulin is a potent target for new hypothalamic neuropeptides

L. Horv́ath, N. Barkhudaryan, A. A. Galoyan, J. Ovádi

Research output: Contribution to journalArticle

2 Citations (Scopus)


Recently, five glycopeptides with coronaro-constrictory properties were isolated from bovine hypothalamus [(1988) Neurochemistry (USSR) 7, 519-524]. Calmodulin has been recognized in our laboratory as a target protein for the neuropeptides isolated from hypothalamus. The results of indirect enzyme-linked immunosorbent assay have shown that the new hypothalamic neuropeptides antagonize with the monospecific anti-calmodulin antibody for Calmodulin binding although they are not fragments of Calmodulin. The inhibitory potency of the peptides is dependent on their concentration and the length of the polypeptide chain. Four out of five peptides are effective in nM concentration range. Ca2+ stimulates the binding of peptides to calmodulin; however, immunocomplex can be formed in the absence of Ca2+ as well. The effects of trifluoperazine and peptides on the calmodulin/antibody interaction are not additive, suggesting the cooperativity between the binding sites on calmodulin. Under physiological conditions the presence of the peptides could produce distinct conformers of calmodulin which may exhibit altered potency for stimulation/inhibition of target enzymes.

Original languageEnglish
Pages (from-to)197-200
Number of pages4
JournalFEBS letters
Issue number1-2
Publication statusPublished - Dec 10 1990


  • Anti-CaM activity
  • Cooperative binding
  • Enzyme-linked immunosorbent assay
  • Neuropeptide

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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