ホタテガイにおけるmeso-α-iminodipropionic acidおよびd-α-iminopropioacetic acidの生合成〔英文〕

概要

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The biosynthesizing ability of both meso-α-iminodipropionic acid (IDPA) and D-α-imino-propioacetic acid (IPAA) in scallop Patinopecten yessoensis was investigated by incubating four 14C-labeled compounds: L-alanine, glycine, propionate and pyruvate, with the adductor muscle and mid-gut gland homogenates. Incorporation of radioactivity into both IDPA and IPAA from three of these radioactive compounds (not from propionate) was confirmed in the adductor muscle, but not in the mid-gut gland. The incorporation rates and ratios of each radioactive compound in IDPA and IPAA suggest that their common precursor was pyruvate and that L-alanine or glycine participated as the partner. And also their metabolisms seem quite active judged from the incor-poration rates of 14C-labeled L-alanine and glycine, which amounts added to the homogenates were extremely small as compared with their native contents. The biological role of IDPA and IPAA in molluscs, is like that of octopine, contributing to the regulation of the redox balance of invertebrate muscle tissue on behalf of the lactate in vertebrate. For they were biosynthesized only in the muscle tissue under the presence of NADH from amino acids and pyruvate, which is an end product of glycolysis.
日本水産學會の論文