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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3508| Title: | Identification of the Initial Steps in d-Lysine Catabolism in Pseudomonas putida |
| Publisher: | American Society for Microbiology |
| Description: | Pseudomonas putida uses L-lysine as the sole carbon and nitrogen source which preferentially requires its
metabolism through two parallel pathways. In one of the pathways -aminovalerate is the key metabolite,
whereas in the other L-lysine is racemized to D-lysine, and L-pipecolate and -aminoadipate are the key
metabolites. All the genes and enzymes involved in the D-lysine pathway, except for those involved in the
conversion of D-lysine into 1-piperideine-2-carboxylate, have been identified previously (30). In this study we
report that the conversion of D-lysine into 1-piperideine-2-carboxylate can be mediated by a D-lysine aminotransferase
(PP3590) and a D-lysine dehydrogenase (PP3596). From a physiological point of view PP3596 plays
a major role in the catabolism of D-lysine since its inactivation leads to a marked reduction in the growth rate
with L- or D-lysine as the sole carbon and nitrogen source, whereas inactivation of PP3590 leads only to slowed
growth. The gene encoding PP3590, called here amaC, forms an operon with dpkA, the gene encoding the
enzyme involved in conversion of 1-piperideine-2-carboxylate to L-pipecolate in the D-lysine catabolic pathway.
The gene encoding PP3596, called here amaD, is the fifth gene in an operon made up of seven open reading
frames (ORFs) encoding PP3592 through PP3597. The dpkA amaC operon was transcribed divergently from the
operon ORF3592 to ORF3597. Both promoters were mapped by primer extension analysis, which showed that
the divergent 35 hexamers of these operon promoters were adjacent to each other. Transcription of both
operons was induced in response to L- or D-lysine in the culture medium. This study was supported by grant BIO2003-0515 and BIO2006- 05668 from the CICYT. Peer reviewed |
| URI: | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3508 |
| Other Identifiers: | Journal of Bacteriology 189(7): 2787–2792 (2007) 1098-5530 http://hdl.handle.net/10261/3508 10.1128/JB.01538-06 |
| Appears in Collections: | Digital Csic |
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