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  • Title: The OCT plasmid encodes D-lysine membrane transport and catabolic enzymes in Pseudomonas putida.
    Author: Cao X, Kolonay J, Saxton KA, Hartline RA.
    Journal: Plasmid; 1993 Sep; 30(2):83-9. PubMed ID: 8234494.
    Abstract:
    Pseudomonas putida (oleovorans) (Pp(OCT)) cured of its OCT plasmid (Pp) no longer grows on D-lysine. Conjugation of PpTrp- with three different methionine auxotrophs carrying the OCT plasmid resulted in PpTrp- (OCT) organisms that grew on D-lysine. Three early D-lysine catabolic enzymes encoded by the OCT plasmid are a lysine racemase, the proposed conversion of D-lysine to delta 1-piperidine-2-carboxylate (P2C), for which we provide evidence, and P2C reductase which converts P2C to pipecolate. In Pp the rate of active D-lysine transport is reduced by 30 to 50%. We consider this to reflect a loss of the gene for the D-lysine carrier while the remaining activity is due to a chromosomally coded L-lysine or D-ornithine carrier or both. The membrane carriers and catabolic enzymes for D- and L-lysine in P. putida P2 and for L-lysine in Pp(OCT) are chromosomally coded.
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