title: Enantioselective degradation and unidirectional chiral inversion of 2-phenylbutyric acid, an intermediate from linear alkylbenzene, by Xanthobacter flavus PA1.
abstract: Microbial degradation of the chiral 2-phenylbutyric acid (2-PBA), a metabolite of surfactant linear alkylbenzene sulfonates (LAS), was investigated using both racemic and enantiomer-pure compounds together with quantitative stereoselective analyses. A pure culture of bacteria, identified as Xanthobacter flavus strain PA1 isolated from the mangrove sediment of Hong Kong Mai Po Nature Reserve, was able to utilize the racemic 2-PBA as well as the single enantiomers as the sole source of carbon and energy. In the presence of the racemic compounds, X. flavus PA1 degraded both (R) and (S) forms of enantiomers to completion in a sequential manner in which the (S) enantiomer disappeared much faster than the (R) enantiomer. When the single pure enantiomer was supplied as the sole substrate, a unidirectional chiral inversion involving (S) enantiomer to (R) enantiomer was evident. No major difference was observed in the degradation intermediates with either of the individual enantiomers when used as the growth substrate. Two major degradation intermediates were detected and identified as 3-hydroxy-2-phenylbutanoic acid and 4-methyl-3-phenyloxetan-2-one, using a combination of liquid chromatography-mass spectrometry (LC-MS), and (1)H and (13)C nuclear magnetic resonance (NMR) spectroscopy. The biochemical degradation pathway follows an initial oxidation of the alkyl side chain before aromatic ring cleavage. This study reveals new evidence for enantiomeric inversion catalyzed by pure culture of environmental bacteria and emphasizes the significant differences between the two enantiomers in their environmental fates.
authors.affiliation: School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Yishan
authors.initials: Y
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: Han
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Li
authors.forename: Kaimin
authors.initials: K
authors.lastname: Shih
authors.forename: Ji-Dong
authors.initials: JD
authors.lastname: Gu
mesh_terms: D001554:Benzene / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002384:Catalysis; D002853:Chromatography, Liquid / Q000379:methods; D003470:Culture Media; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D010654:Phenylbutyrates / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013237:Stereoisomerism; D020584:Xanthobacter / Q000378:metabolism*
chemical_list: D003470:Culture Media; D010654:Phenylbutyrates; D012989:Soil Pollutants; D001554:Benzene; C039714:2-phenylbutyric acid