DISTRIBUTION OF THREONINE ALDOLASE ACTIVITY WITH DIFFERENT STEREOSPECIFICITIES IN AEROBIC-BACTERIA

Threonine aldolase activities (threonine acetaldehydelyase activity) w ith different stereospecificities toward 4 isomers of threonine were f ound in a variety of aerobic bacteria. The strains could be divided in to three groups on the basis of the substrate specificity of a cell-fr ee extract. The enzyme activities toward D-allo- and D-threonine were inhibited by EDTA, which suggested that a metal ion participates in th e D-specific aldolase reaction.