Abstract
A peptide or a small protein released from an exocrine gland or in urine is utilized as a chemosignal that elicits social or reproductive behavior in mice. Recently, we identified the male-specific peptide, exocrine gland-secreting peptide 1 (ESP1), in mouse tear fluids that enhanced female sexual receptive behavior, and determined the three dimensional structure. ESP1 appears to be a member of multigene family that consists of 38 genes in mice, which we call the ESP family. ESP4, a member of the ESP family, is expressed in various exocrine glands, and shows the highest sequence similarity with ESP1. Here, we report the NMR assignments of ESP4 which provides a basis for NMR analyses of this protein. Our results will give insight into structural relationships within the ESP family.
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