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J Bacteriol. 1969 November; 100(2): 890-894
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Reductive Pentose Cycle and Formate Assimilation in Rhodopseudomonas palustris

¹ Department of Microbiology, The University of Texas, Austin, Texas 78712

ABSTRACT

Rhodopseudomonas palustris assimilated formate autotrophically as carbon dioxide and hydrogen arising from the activity of the formic hydrogenlyase system. Kinetic analyses of cell suspensions pulse-labeled with ¹⁴C-formate or ¹⁴C-bicarbonate showed similar distributions of incorporated radioactivity. In both cases phosphate esters were the first assimilation products. Ribulose diphosphate carboxylase, phosphoribose isomerase, and phosphoribulokinase, characteristic enzymes of the reductive pentose cycle, were present in extracts of cells grown on formate.