Characterization of Peptidylglycine α-Amidating Activities in Rat Pituitary, Brain and Small Intestine Using Glycine-Extended C-Terminal Analogues of Vasoactive Intestinal Polypeptide as Substrate

Masato Noguchi, Kenichi Takahashi, Hiroshi Okamoto

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Peptidylglycine α-amidating activities from rat pituitary, brain and small intestine were compared, utilizing C-terminal analogues of vasoactive intestinal polypeptide (VIP), D-Tyr-Leu-Asn-Gly and D-Tyr-Asn-Gly, and C-terminal analogue of α-MSH, D-Tyr-Val-Gly. The three tissues had enzymic activities capable of converting the glycine-extended peptides to the corresponding α-amidated ones. In other words, all of three peptides could serve as substrates for the enzymes from both neural and gastrointestinal tissues. The activities were stimulated in the presence of copper and ascorbate; the optimal concentration of each cofactor was roughly equal for the three enzymes; similar pH profiles (a neutral pH optimum at 6.5-7 and another one at 8-8.5) were also observed. Desamide VIP-Gly was proved to be a potent inhibitor of the α-amidating activities from the tissues, but VIP was not, indicating that the α-amidating enzymes from these tissues in common have a recognition site for the C-terminal glycine of the glycine-extended precursor regardless of the length and nature of the sequence. No fundamental differences were observed between the catalytic properties of the alpha-amidating activities from these three tissues, raising the possibility that similar enzymes, which may or may not be a single species, are functioning in tissues that produce alpha-amidated polypeptides in vivo.

本文言語English
ページ(範囲)191-207
ページ数17
ジャーナルthe tohoku journal of experimental medicine
156
2
DOI
出版ステータスPublished - 1988

ASJC Scopus subject areas

  • 生化学、遺伝学、分子生物学(全般)

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