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The oxidation level of oxalate is such that incorporation of its carbon into cell constituents must involve a net reduction. If it is the sole carbon source for microbial growth then it must also undergo condensation reactions resulting in the synthesis of, for example, C3 and C4 units necessary for formation of carbohydrate and amino acid carbon skeletons (for a review of this aspect, see Kornberg, 1959). Previous work, mainly with whole cells of P8eudomona8 oxalaticus (Quayle & Keech, 1959a, 1960) indicated that a reductive step precedes any condensation reactions, and that this initial reduction reaction is that of oxalylcoenzyme A to glyoxylate. It was also suggested that successive steps involve condensation of two molecules of the glyoxylate to tartronic acid semialdehyde, which in turn is reduced to glyceric acid by a reaction sequence similar to that proposed for the growth of Pseudomona8 species on glycollate (Kornberg & Gotto, 1959). The formation and metabolism of oxalylcoenzyme A, including its reduction to glyoxylate by reduced triphosphopyridine nucleotide in cellfree extracts of P. oxalaticus, are reported in this paper. Part of this work has been presented to the Biochemical Society (Quayle, Keech & Taylor, 1960).

Carbon assimilation by Pseudomonas oxalaticus (OXI). 4. Metabolism of oxalate in cell-free extracts of the organism grown on oxalate