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Biocarbonate Effect on the Photophosphorylation Catalyzed by Chromatophores Isolated from Chromatium Strain D

XII. Structure and Function of Chloroplast Proteins ¹

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

Photophosphorylation catalyzed by chromatophores prepared from Chromatium strain D was stimulated by bicarbonate. The stimulative effect was pH dependent and the lower the pH the more marked the activation. At pH 8.0, bicarbonate (8 mM) exhibited a negligible effect, whereas at pH 7.0 approximately a 5-fold activation was observed. The apparent activation constant of bicarbonate was determined to be approximately 10.2 mM, at which concentration approximately a 7-fold activation of photophosphorylation was observed.

¹ This work was supported in part by research grants from the Ministry of Education of Japan (No. 560009) and the Toray Science Foundation (Tokyo).