Please use this identifier to cite or link to this item: https://doi.org/10.1128/AEM.68.1.143-151.2002
Title: Elucidation of the flavonoid catabolism pathway in Pseudomonas putida PML2 by comparative metabolic profiling
Authors: Pillai, B.V.S.
Swarup, S. 
Issue Date: 2002
Citation: Pillai, 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
Abstract: Flavonoids 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.
Source Title: Applied and Environmental Microbiology
URI: http://scholarbank.nus.edu.sg/handle/10635/100570
ISSN: 00992240
DOI: 10.1128/AEM.68.1.143-151.2002
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

46
checked on Jul 10, 2019

WEB OF SCIENCETM
Citations

45
checked on Jul 10, 2019

Page view(s)

46
checked on May 25, 2019

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.