title: A new immunological approach to the detection and the quantitation of the Met5-enkephalin precursors in rat brain.
abstract: We describe a new approach to the detection and quantitation of the enkephalin precursor. The approach is based on the production of antibody against a sequential determinant which is obtained specifically and quantitatively from the enkephalin precursor by tryptic hydrolysis. We chose the hexapeptide Tyr-Gly-Gly-Phe-Met-Arg and developed antibody against the C-terminus of this peptide. The hexapeptide is released from the precursor by mere tryptic cleavage. The antibody permits us to detect the Met-enkephalin precursor at the picomole level. Using this approach, we have quantitated the precursor forms in rat striatum and hypothalamus. The precursor/Met-enkephalin ratio was close to 3/4. This result was in very good agreement with the ratio determined previously in the bovine adrenal medulla.
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D004744:Enkephalin, Methionine / Q000032:analysis* / Q000276:immunology; D011498:Protein Precursors / Q000032:analysis* / Q000276:immunology; D011817:Rabbits / Q000276:immunology; D011863:Radioimmunoassay; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011498:Protein Precursors; D004744:Enkephalin, Methionine