ELIZA

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305) Transposon mutagenesis and bioinformatics analyses identified four clusters of steroid degradation (std) genes encoding a single catabolic pathway.

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PMID:24428272 DOI:10.1111/1462-2920.12395

2015 Environmental microbiology

* Functional analyses of three acyl-CoA synthetases involved in bile acid degradation in Pseudomonas putida DOC21.

- Pseudomonas putida DOC21, a soil-dwelling proteobacterium, catabolizes a variety of steroids and bile acids. Transposon mutagenesis and bioinformatics analyses identified four clusters of steroid degradation (std) genes encoding a single catabolic pathway. The latter includes three predicted acyl-CoA synthetases encoded by stdA1, stdA2 and stdA3 respectively. The ΔstdA1 and ΔstdA2 deletion mutants were unable to assimilate cholate or other bile acids but grew well on testosterone or 4-androstene-3,17-dione (AD). In contrast, a ΔstdA3 mutant grew poorly in media containing either testosterone or AD. When cells were grown with succinate in the presence of cholate, ΔstdA1 accumulated Δ(1/4) -3-ketocholate and Δ(1,4) -3-ketocholate, whereas ΔstdA2 only accumulated 7α,12α-dihydroxy-3-oxopregna-1,4-diene-20-carboxylate (DHOPDC). When incubated with testosterone or bile acids, ΔstdA3 accumulated 3aα-H-4α(3'propanoate)-7aβ-methylhexahydro-1,5-indanedione (HIP) or the corresponding hydroxylated derivative. Biochemical analyses revealed that StdA1 converted cholate, 3-ketocholate, Δ(1/4) -3-ketocholate, and Δ(1,4) -3-ketocholate to their CoA thioesters, while StdA2 transformed DHOPDC to DHOPDC-CoA. In contrast, purified StdA3 catalysed the CoA thioesterification of HIP and its hydroxylated derivatives. Overall, StdA1, StdA2 and StdA3 are acyl-CoA synthetases required for the complete degradation of bile acids: StdA1 and StdA2 are involved in degrading the C-17 acyl chain, whereas StdA3 initiates degradation of the last two steroid rings. The study highlights differences in steroid catabolism between Proteobacteria and Actinobacteria.

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--- WordNet output for identified --- =>確認飛行物体;略:IFO Overview of verb identify The verb identify has 6 senses (first 6 from tagged texts) 1. (32) identify, place -- (recognize as being; establish the identity of someone or something; "She identified the man on the 'wanted' poster") 2. (7) name, identify -- (give the name or identifying characteristics of; refer to by name or some other identifying characteristic property; "Many senators were named in connection with the scandal"; "The almanac identifies the auspicious months") 3. (6) identify -- (consider (oneself) as similar to somebody else; "He identified with the refugees") 4. (4) identify -- (conceive of as united or associated; "Sex activity is closely identified with the hypothalamus") 5. (2) identify, discover, key, key out, distinguish, describe, name -- (identify as in botany or biology, for example) 6. (2) identify -- (consider to be equal or the same; "He identified his brother as one of the fugitives") Overview of adj identified The adj identified has 1 sense (first 1 from tagged texts) 1. (1) identified -- (having the identity known or established; "the identified bodies were released for burial") --- WordNet end ---