Molecular properties of endogenous RFamide-related peptide-3 and its interaction with receptors |
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Authors: | Yoshida Hiromi Habata Yugo Hosoya Masaki Kawamata Yuji Kitada Chieko Hinuma Shuji |
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Institution: | Discovery Research Laboratories I, Pharmaceutical Research Division, Takeda Chemical Industries, Ltd., 10 Wadai, Ibaraki 300-4293, Tsukuba, Japan. |
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Abstract: | Based on database searches of DNA sequences, we previously reported a gene encoding peptides possessing Arg-Phe-NH(2) (RFamide) at their C termini. This gene, RFamide-related peptide (RFRP), was expected to encode several different peptides (i.e., RFRP-1, -2, and -3). In the present study, we purified endogenous RFRP-3 from bovine hypothalamus, and demonstrated that it consisted of 28 amino acid residues. After constructing a sandwich enzyme immunoassay for RFRP-3, we analyzed the tissue distribution of endogenous RFRP-3 in rats and found its concentration to be highest in the hypothalamus. In binding assays, 125I]-labeled RFRP-3 bound to OT7T022 with high affinity, but its binding affinity to HLWAR77 was low. On the other hand, 125I]-labeled neuropeptide FF (NPFF) bound to both OT7T022 and HLWAR77 with high affinity. By serial deletion in the N-terminal portions of RFRP-3 and NPFF, we found that four C-terminal amino acid residues (i.e., PQRFamide), which were common between the two peptides, comprised a core sequence responsible for binding with the receptors, whereas three amino acid residues (i.e., PNL in RFRP-3 and LFQ in NPFF) added to the N terminus of PQRFamide played crucial roles in the agonistic activities of RFRP-3 and NPFF for OT7T022 and HLWAR77, respectively. |
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