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Relaxin-3
Relaxin-3 is a neuropeptide that was discovered in 2001, and which is highly conserved in species ranging from flies, fish, rodents and humans. Relaxin-3 is a member and ancestral gene of the relaxin family of peptides, which includes the namesake hormone relaxin (designated 'H2 relaxin' in humans) which mediates peripheral actions during pregnancy and which was found to relax the pelvic ligament in guinea pigs almost a century ago. The cognate receptor for relaxin-3 is the G-protein coupled receptor RXFP3 (relaxin family peptide 3 receptor), however relaxin-3 is pharmacologically able to also cross react with RXFP1 and RXFP3 (although the physiological relevance of such interactions, if they exist endogenously, are currently unknown).
==Structure==
Relaxin-3 consists of 51 amino acids in humans which are arranged into a two-chain structure (designated the A-chain and B-chain). There are three disulfide bonds (two interchain, one intrachain), with the residues that mediate binding to/activation of RXFP3 residing within the B-chain. At translation, pro-relaxin-3 also contains a C-chain (in between the A and B-chains) which is removed via protolytic cleavage to form the mature neuropeptide.
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