Isolation and Structural Characterization of Pituitary Adenylate Cyclase Activating Polypeptide (PACAP)-like Peptide From the Brain of a Teleost, Stargazer, Uranoscopus japonicus

Abstract

Matsuda, K., Y. Takei, J.-I. Katoh, S. Shioda, A. Arimura and M. Uchiyama. Isolation and structural characterization of pituitary adenylate cyclase activating polypeptide (PACAP)-like peptide from the brain of a teleost, stargazer, Uranoscopus japonicus. Peptides 18 (5) 723–727, 1997.—Pituitary adenylate cyclase-activating polypeptide (PACAP) is a novel neuropeptide consisting of 38-residue (PACAP 1–38) and a truncated form with 27 residues (PACAP 1–27) that plays several roles in tetrapods. We isolated a highly purified PACAP-like peptide from the brain of a teleost, the stargazer, by extracting of acetone-dried powder with acetic acid followed by high-performance liquid chromatography (HPLC) on gel-filtration, cation-exchange, and reverse-phase columns. Purification was monitored by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting analysis using an anti-PACAP 1–27 antiserum. The PACAP-like peptide thus obtained had a molecular mass of 4,623, determined by mass spectrometry, and its amino acid sequence showed 89 and 87% identity with those of ovine and frog PACAPs, respectively. These results indicate that a PACAP-like peptide, which is a highly homologous with tetrapod PACAP, is present in the teleost brain.