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• W2113012913 startingPage "951" @default.
• W2113012913 abstract "ABSTRACT Pseudomonas sp. strain HR199 is able to utilize eugenol (4-allyl-2-methoxyphenol), vanillin (4-hydroxy-3-methoxybenzaldehyde), or protocatechuate as the sole carbon source for growth. Mutants of this strain which were impaired in the catabolism of vanillin but retained the ability to utilize eugenol or protocatechuate were obtained after nitrosoguanidine mutagenesis. One mutant (SK6169) was used as recipient of a Pseudomonas sp. strain HR199 genomic library in cosmid pVK100, and phenotypic complementation was achieved with a 5.8-kbp Eco RI fragment (E58). The amino acid sequences deduced from two corresponding open reading frames (ORF) identified on E58 revealed high degrees of homology to pcaG and pcaH , encoding the two subunits of protocatechuate 3,4-dioxygenase. Three additional ORF most probably encoded a 4-hydroxybenzoate 3-hydroxylase (PobA) and two putative regulatory proteins, which exhibited homology to PcaQ of Agrobacterium tumefaciens and PobR of Pseudomonas aeruginosa , respectively. Since mutant SK6169 was also complemented by a subfragment of E58 that harbored only pcaH , this mutant was most probably lacking a functional β subunit of the protocatechuate 3,4-dioxygenase. Since this mutant was still able to grow on protocatechuate and lacked protocatechuate 4,5-dioxygenase and protocatechuate 2,3-dioxygenase, the degradation had to be catalyzed by different enzymes. Two other mutants (SK6184 and SK6190), which were also impaired in the catabolism of vanillin, were not complemented by fragment E58. Since these mutants accumulated 3-carboxy muconolactone during cultivation on eugenol, they most probably exhibited a defect in a step of the catabolic pathway following the ortho cleavage. Moreover, in these mutants cyclization of 3-carboxymuconic acid seems to occur by a syn absolute stereochemical course, which is normally only observed for cis , cis -muconate lactonization in pseudomonads. In conclusion, vanillin is degraded through the ortho -cleavage pathway in Pseudomonas sp. strain HR199 whereas protocatechuate could also be metabolized via a different pathway in the mutants." @default.
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• W2113012913 date "1999-03-01" @default.
• W2113012913 modified "2023-10-12" @default.
• W2113012913 title "Molecular Characterization of the Genes <i>pcaG</i> and <i>pcaH</i> , Encoding Protocatechuate 3,4-Dioxygenase, Which Are Essential for Vanillin Catabolism in <i>Pseudomonas</i> sp. Strain HR199" @default.
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• W2113012913 doi "https://doi.org/10.1128/aem.65.3.951-960.1999" @default.
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