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lysine racemase, although functionally inactive for growth purposes, may still have regulatory significance in permitting cross-induction of D-lysine-related enzymes by L-lysine, and vice versa
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L-Lys gives rise to L-pipecolate that is utilized in the biosynthesis of the piperidine alkaloids 1-acetoxy-6-aminooctahydroindolizine and 3,4,5-trihydroxyoctahydro-1-pyridine. D-Lys is converted to D-N6-acetyllysine prior to further catabolism
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the Oenococcus oeni lysine racemase has a specific activity towards basic amino acids, residues Thr224 and Trp355 are important for enzyme substrate specificity
