Metabolism of 5-hydroxylysine in Pseudomonas fluorescens

Abstract

Hydroxylysine is metabolized via two routes by a Pseudomonas fluorescens strain as shown by the oxidation of selected intermediates. Hydroxy-ilysine is oxidized via a pathway analogous to the monooxygenase pathway for ilysine, and data suggest that at least some of the enzymes are those involved in the metabolism of ilysine. Hydroxy-Irlysine is also converted by a racemase to allohydroxy-D-lysine, which is then degraded via a pathway analogous to, but different from, that described for D-lysine, involving hydroxy-L-pipecolate, 2amino-5-hydroxyadipate, and 2-hydroxyglutarate. Data obtained with mutants unable to oxidize L-pipecolate suggest that the enzymes for the metabolism of hydroxy-L-pipecolate are distinct from those for L-pipecolate. Studies on nand Llysine degradation have shown that the previously described pathways for these compounds are present in this soil pseudomonad.