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Enzymatic Defects in Three Genetic Classes of Serine-Requiring Mutants of Bacillus pumilus

Department of Biological Sciences, University of Maryland Baltimore County, Catonsville, Maryland 21228
Department of Microbiology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

ABSTRACT

Serine-requiring mutants of Bacillus pumilus NRRL B-3275 have been divided into three groups based on the position of the mutant loci on the linkage map of this organism. Representatives of each group were found deficient in enzymatic activities that constitute the phosphorylated pathway for serine biosynthesis. The evidence suggests that the genes coding for the enzymes of the phosphorylated pathway of serine biosynthesis are not clustered in B. pumilus.