微生物によるアミノ酸の代謝-1-リジンからの5-アミノ吉草酸の生成

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Several Pseudomonas strains were found to accumulate an amino acid in the culture broth when grown in a lysine-containing medium. The amino acid was isolated in crystalline form from the broth and was identified as 5-aminovaleric acid (5-AVA) from its melting point, chemical composition, infrared absorption spectrum and other properties. 5-AVA production from L-lysine in Pseudomonas fluorescens IAM-3 was investigated in detail. 5-AVA-producing activity of the organism was induced with L-lysine in the medium and repressed with glucose. The optimal pH-value for the conversion was about 9.0. After the organism was grown for 48 hours in a glucose-mineral medium containing corn steep liquor (0.3%) and L-lysine hydrochloride (2mg/ml), L-lysine hydrochloride was added to the culture medium in various concentrations, and the incubation was continued further for 72 hours. When the concentrations of L-lysine added were 20mg/ml and 60mg/ml, 5-AVA yields were 75% and 65%, respectively. With acetone-dried cells, 5-AVA was obtained in nearly 100% yield when the concentration of L-lysine hydrochloride was 40mg/ml, and 25mg of 5-AVA per millilitre was accumulated within 12 hours.
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