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Plant and Cell Physiology, 1980, Vol. 21, No. 6 1077-1084
© 1980

Article

Glycine-serine transformation in the photosynthetic bacterium Chromatium vinosum1,2

Mamoru Sado, Sumio Asami3, Mikio Nishimura and T. Akazawa

Research Institute for Biochemical Regulation, School of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

The metabolic transformation of glycine into serine in the photosynthetic bacterium Chromatium vinosum was accompanied by the evolution of CO2 due to decarboxylation of glycine. Isonicotinylhydrazide inhibited both 14CO2 evolution and the formation of 14C-serine from 14C-glycine. The results indicate that a glycine-serine transformation reaction takes place which is analogous to that occurring in green leaf tissues. Glycine may be metabolised through serine by this reaction. The light stimulation of 14CO2 evolution and 14C-serine formation from 14C-glycine by the Chromatium cells are judged to be results of the light-induced enhancement of 14C-glycine uptake by the bacterial cells.

1This is paper 53 in the series "Structure and Function of Chloroplast Proteins" and paper 7 of the series "Biosynthetic Mechanism of Glycolate in Chromatium". Paper 6 of the latter series is Ref. 3 by Asami and Akazawa (1978).

2This study was aided by research grants from the Ministry of Education, Science and Culture of Japan and the Nissan Science Foundation (Tokyo).

3Postdoctoral Fellow (1980) of the Japan Society for the Promotion of Science.

(Received May 20, 1980; )
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