Co-metabolism of di- and trichlorobenzoates in a 2-chlorobenzoate-degrading bacterial culture: Effect of the position and number of halo-substituents |
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Authors: | Grazia Baggi Silvana Bernasconi Maurizio Zangrossi Lucia Cavalca Vincenza Andreoni |
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Institution: | aDipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy;bDipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy |
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Abstract: | The degradative properties towards chlorobenzoates by a 2-chlorobenzoate-degrading mixed culture (2MC) were investigated. Although 2MC did not grow on 2,3,5-; 2,3,6- and 2,4,6-trichlorobenzoates, it was able to completely oxidise 2,3,5-trichlorobenzoate and 2,5-dichlorobenzoate. This was degraded through the intermediate formation of 4-chlorocatechol and 3-cis,cis-chloromuconate, suggesting a dioxygenation in 1,2 position. 4-Chlorobenzoate; 3,4- and 2,6-dichlorobenzoate; 2,4,6- and 2,3,6-trichlorobenzoate did not undergo any co-metabolic transformation, the only 2,4-dichlorobenzoate was scarcely transformed into a dichlorinated phenol as end-product. 2MC was constituted of three prominent species: Stenotrophomonas maltophilia, Cupriavidus necator and Flavobacterium sp. Ring-hydroxylating dioxygenase genes (BenA) were retrieved in S. maltophilia and C. necator, indicating the presence of a “modified ortho pathway” in the culture. On the basis of its degradative properties, 2MC could be a good candidate for use in the removal of ortho- and/or meta-chlorobenzoates that are the major end-products of PCB co-metabolism. |
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Keywords: | Biodegradation Co-metabolism (Chloro)benzoate dioxygenase Halo-substituent Ortho- meta- para-position |
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