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2-Bromooctanoic acid (2-BrOA) is known toblock the formation of polyhydroxyalkanoic acid (PHA) inPseudomonas fluorescens BM07 without any influence on thecell growth when grown on fructose, but it inhibits the cellgrowth when grown on octanoate (OA) (Lee et al., Appl.Environ. Microbiol. 67: 4963- 4974, 2001). We investigatedthe role of 2-BrOA in the PHA synthesis of the bacteriumgrown with mixtures of fructose and fatty acids. OA, 11-phenoxyundecanoic acid (11-POU), and 5-phenylvaleric acid(5-PV) were selected as model substrates. When supplementedwith 50 mM fructose, all these carboxylic acids suppressedthe formation of PHA from fructose, however, the β-oxidationcoenzyme A monomers derived from the carboxylic acids wereefficiently polymerized, but the conversion yield [(mol ofcarboxylate substrate converted into PHA)/(mol of carboxylatesubstrate in the feed)] was low (e.g., maximally ~53% for5 mM 11-POU). Addition of 2-BrOA (up to 5 mM) to themixed carbon sources raised the conversion yield sensitivelyand effectively only at low levels of the acid substrates (e.g.,2 mM 11-POU or 5 mM OA): For instance, 100% of 2 mM11-POU were converted into PHA in the presence of 5 mM2-BrOA, whereas only ~10% of the 11-POU were convertedin the absence of 2-BrOA. However, at highly saturatedsuppressing levels (e.g., 5 mM 11-POU), 2-BrOA inhibitorshowed no significant additional effect on the conversion(60-70% conversion irrespective of 2-BrOA level). The existenceof competitive and compensative relationship between 2-BrOA and all the carboxylic acid substrates used may indicatethat all the acid substrate-derived inhibiting species bind tothe same site as the 2-BrOA inhibiting species does. We,therefore, suggest that 2-BrOA can be used for efficientlyincreasing the yield of conversion of expensive substitutedfatty acids into PHA and then substituted 3-hydroxyacids byhydrolyzing it.

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