Molecular properties of endogenous RFamide-related peptide-3 and its interaction with receptors - PubMed (original) (raw)
Comparative Study
. 2003 Feb 17;1593(2-3):151-7.
doi: 10.1016/s0167-4889(02)00389-0.
Affiliations
- PMID: 12581859
- DOI: 10.1016/s0167-4889(02)00389-0
Free article
Comparative Study
Molecular properties of endogenous RFamide-related peptide-3 and its interaction with receptors
Hiromi Yoshida et al. Biochim Biophys Acta. 2003.
Free article
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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