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Differential protein expression during growth on model and commercial mixtures of naphthenic acids in Pseudomonas fluorescens Pf‐5

McKew, Boyd A and Johnson, Richard and Clothier, Lindsay and Skeels, Karl and Ross, Matthew S and Metodiev, Metodi and Frenzel, Max and Gieg, Lisa M and Martin, Jonathan W and Hough, Michael A and Whitby, Corinne (2021) 'Differential protein expression during growth on model and commercial mixtures of naphthenic acids in Pseudomonas fluorescens Pf‐5.' MicrobiologyOpen, 10 (4). ISSN 2045-8827

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Abstract

Naphthenic acids (NAs) are carboxylic acids with the formula (CnH2n+ZO2) and are among the most toxic, persistent constituents of oil sands process-affected waters (OSPW), produced during oil sands extraction. Currently, the proteins and mechanisms involved in NA biodegradation are unknown. Using LC-MS/MS shotgun proteomics, we identified proteins overexpressed during the growth of Pseudomonas fluorescens Pf-5 on a model NA (4′-n-butylphenyl)-4-butanoic acid (n-BPBA) and commercial NA mixture (Acros). By day 11, >95% of n-BPBA was degraded. With Acros, a 17% reduction in intensity occurred with 10–18 carbon compounds of the Z family −2 to −14 (major NA species in this mixture). A total of 554 proteins (n-BPBA) and 631 proteins (Acros) were overexpressed during growth on NAs, including several transporters (e.g., ABC transporters), suggesting a cellular protective response from NA toxicity. Several proteins associated with fatty acid, lipid, and amino acid metabolism were also overexpressed, including acyl-CoA dehydrogenase and acyl-CoA thioesterase II, which catalyze part of the fatty acid beta-oxidation pathway. Indeed, multiple enzymes involved in the fatty acid oxidation pathway were upregulated. Given the presumed structural similarity between alkyl-carboxylic acid side chains and fatty acids, we postulate that P. fluorescens Pf-5 was using existing fatty acid catabolic pathways (among others) during NA degradation.

Item Type: Article
Uncontrolled Keywords: naphthenic acids, oil sands process-affected water, proteomics, Pseudomonas fluorescens, tailing ponds, toxicity
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Elements
Date Deposited: 20 Jul 2021 08:19
Last Modified: 20 Jul 2021 08:19
URI: http://repository.essex.ac.uk/id/eprint/30765

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