Cysteic acid transamination

The formation mechanism of lactosulphonic acid is unknown (Ref. 20). It might have been derived from cysteic acid by oxidation or transamination reactions. 

S. Darling. Cysteic acid transaminase. Nature, 1952, 170 749. F. Chatagner, B. Bergeret, T. Sejourne, and C. Fromageot. Transamination et desulfination de l ac. cysteinesulfinique. Bio-chim. Biophys. Acta, 1952, 9 340. 

A mixture of cysteic acid with oxaloacetic or o-ketoglutaric acid was maintained for one hour at pH of 7.7 in a 0.07 M phosphate buffer solution with transaminase, prepared according to Cohen s technic. Under these conditions transamination amounts to 15 to 18%. To the mixture so obtsuned and consequently containing a certain amount of sulfopyruvic acid, they added either ground liver or ground muscle and then maintained the reaction mixture for two hours in presence of oxygen. In each of these experiments the authors were unable to show any appreciable formation of sulfate from sulfopyruvic acid. 

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