FMRF is a peptide consisting of 4 amino acid residues.
CAT No: R1364
CAS No:74012-06-9
Synonyms/Alias:FMRF;74012-06-9;L-Phenylalanine, L-phenylalanyl-L-methionyl-L-arginyl-;(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-4-methylsulfanylbutanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-phenylpropanoic acid;DTXSID50432751;F-M-R-F;DTXCID70383579;HY-P0293;DA-53371;MS-30610;Phenylalanyl-Methionyl-Arginyl-Phenylalanin;G12287;(S)-2-((S)-2-((S)-2-((S)-2-Amino-3-phenylpropanamido)-4-(methylthio)butanamido)-5-guanidinopentanamido)-3-phenylpropanoic acid;
FMRFamide, a neuropeptide originally identified in mollusks, is a tetrapeptide with the sequence Phe-Met-Arg-Phe-NH2. As a member of the RFamide peptide family, it is recognized for its role as a neuromodulator and neurotransmitter in a variety of invertebrate and vertebrate species. Its functional significance extends across neurophysiology, receptor pharmacology, and peptide signaling research, making it an essential tool compound for investigating peptide-mediated cellular processes and signaling pathways. The unique sequence and amidated C-terminus of FMRFamide confer specific biological activity, facilitating its use in studies of peptide-receptor interactions, synaptic transmission, and neurochemical modulation.
Neurophysiological research: FMRFamide is widely employed in neurophysiological studies to elucidate the mechanisms of peptide-mediated modulation of neuronal excitability. In both invertebrate and vertebrate models, it serves as a prototypical ligand for RFamide receptors, enabling researchers to characterize ion channel regulation, synaptic plasticity, and the integration of peptide signals within neural circuits. Its application in electrophysiological assays has been instrumental in mapping the distribution and function of RFamide-sensitive neurons and in dissecting the cellular basis of neuromodulation.
Receptor pharmacology: As a selective agonist for FMRFamide receptors, this peptide is a valuable probe for studying G protein-coupled receptor (GPCR) signaling. By applying FMRFamide to in vitro receptor assays, researchers can investigate ligand-receptor specificity, downstream second messenger pathways, and receptor desensitization or internalization dynamics. These studies contribute to a deeper understanding of RFamide receptor pharmacology, facilitating drug discovery efforts and the development of novel modulators targeting neuropeptide systems.
Peptide structure-activity relationship (SAR) analysis: The defined sequence of FMRFamide makes it a model compound for SAR investigations within the RFamide peptide family. By utilizing it as a reference ligand, researchers can synthesize and test peptide analogs to assess the impact of sequence modifications on receptor binding affinity, selectivity, and biological activity. Such comparative studies are vital for identifying key residues responsible for bioactivity and for designing optimized peptide-based probes or modulators.
Comparative neurobiology: FMRFamide serves as a molecular marker and functional tool for comparative studies across diverse animal taxa. Its conservation and variation among species enable researchers to trace the evolutionary history of neuropeptide signaling systems, examine species-specific adaptations, and investigate the physiological roles of RFamide peptides in different neural and endocrine contexts. Immunohistochemical localization and peptide mapping using FMRFamide antibodies or analogs provide valuable insights into the distribution and function of RFamide-expressing cells.
Peptide biosynthesis and enzymology: The synthesis, processing, and degradation of FMRFamide are of interest in peptide biochemistry and enzymology. By employing the peptide as a substrate or standard, researchers can study the activity of peptidases, amidating enzymes, and other factors involved in neuropeptide maturation and turnover. These investigations advance the understanding of peptide stability, post-translational modification, and regulatory mechanisms governing neuropeptide homeostasis in biological systems.
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