title: Purification and sequence of a non-opioid peptide derived from ovine proenkephalin: implications for possible species specific processing.
abstract: A non-enkephalin containing pentadeca peptide derived from ovine adrenal proenkephalin has been purified and sequenced. The sequence of the peptide is: Phe-Ala-Glu-Pro-Leu-Pro-Ser-Glu-Glu-Glu-Gly-Glu-Ser-Tyr-Ser (preproenkephalin 237-251) representing the amino portion of peptide B (preproenkephalin 237-268). The sequence is identical to bovine preproenkephalin 237-251, differing from the corresponding human sequence at positions 240 and 244. This peptide can be generated by a processing event common to other opioid peptides and is present in chromaffin granules in significant amounts. The presence of this peptide in substantial quantities suggests a possible difference in proenkephalin processing between the bovine and ovine adrenal medulla.
mesh_terms: D000313:Adrenal Medulla / Q000032:analysis; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D004745:Enkephalins / Q000032:analysis*; D010446:Peptide Fragments / Q000032:analysis*; D011498:Protein Precursors / Q000032:analysis*; D012756:Sheep; D013045:Species Specificity
chemical_list: D000596:Amino Acids; D004745:Enkephalins; D010446:Peptide Fragments; D011498:Protein Precursors; C029992:proenkephalin