Please use this identifier to cite or link to this item: https://doi.org/10.1128/AEM.68.1.143-151.2002
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dc.titleElucidation of the flavonoid catabolism pathway in Pseudomonas putida PML2 by comparative metabolic profiling
dc.contributor.authorPillai, B.V.S.
dc.contributor.authorSwarup, S.
dc.date.accessioned2014-10-27T08:27:19Z
dc.date.available2014-10-27T08:27:19Z
dc.date.issued2002
dc.identifier.citationPillai, B.V.S., Swarup, S. (2002). Elucidation of the flavonoid catabolism pathway in Pseudomonas putida PML2 by comparative metabolic profiling. Applied and Environmental Microbiology 68 (1) : 143-151. ScholarBank@NUS Repository. https://doi.org/10.1128/AEM.68.1.143-151.2002
dc.identifier.issn00992240
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/100570
dc.description.abstractFlavonoids are 15-carbon plant secondary metabolites exuded in the rhizosphere that hosts several flavonoid-degrading bacteria. We studied flavonoid catabolism in a plant growth-promoting rhizobacterial strain of Pseudomonas by using a combination of biochemical and genetic approaches. Transposants carrying miniTn5gfp insertions were screened for flavonoid auxotrophy, and these mutant strains were found to be unable to grow in the flavonols naringenin and quercetin, while their growth in glycerol was comparable to that of the parental strain. In order to understand flavonoid catabolism, culture supernatants, whole-cell fractions, cell lysate, and cell debris of the wild-type and mutant strains were analyzed. Intermediates that accumulated intracellularly and those secreted in the medium were identified by a combination of reversed-phase highpressure liquid chromatography and electrospray ionization-mass spectrometry. Structures of four key intermediates were confirmed by one-dimensional nuclear magnetic resonance spectroscopy. Comparative metabolic profiling of the compounds in the wild-type and mutant strains allowed us to understand the degradation events and to identify six metabolic intermediates. The first step in the pathway involves 3,3'-didehydroxylation, followed by hydrolysis and cleavage of the C-ring, leading via subsequent oxidations to the formation of protocatechuate. This is the first report on quercetin dehydroxylation in aerobic conditions leading to naringenin accumulation.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1128/AEM.68.1.143-151.2002
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentBIOLOGICAL SCIENCES
dc.description.doi10.1128/AEM.68.1.143-151.2002
dc.description.sourcetitleApplied and Environmental Microbiology
dc.description.volume68
dc.description.issue1
dc.description.page143-151
dc.description.codenAEMID
dc.identifier.isiut000173085000019
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