| pubmed-article:697766 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:697766 | lifeskim:mentions | umls-concept:C1280500 | lld:lifeskim |
| pubmed-article:697766 | lifeskim:mentions | umls-concept:C0220807 | lld:lifeskim |
| pubmed-article:697766 | lifeskim:mentions | umls-concept:C0054858 | lld:lifeskim |
| pubmed-article:697766 | lifeskim:mentions | umls-concept:C1510940 | lld:lifeskim |
| pubmed-article:697766 | pubmed:issue | 1 | lld:pubmed |
| pubmed-article:697766 | pubmed:dateCreated | 1978-12-2 | lld:pubmed |
| pubmed-article:697766 | pubmed:abstractText | 1. The influence of halogen substituents on the 1,2-dioxygenation of catechols was investigated. The results obtained with the two isoenzymes pyrocatechase I and pyrocatechase II from the haloarene-utilizing Pseudomonas sp. B 13 and the pyrocatechase from benzoate-induced cells of Alcaligenes eutrophus B.9 were compared. 2. Substituents on catechol were found to interfere with O2 binding by the two isoenzymes from Pseudomonas sp. B 13, whereas the Km value for catechol kept constant at different O2 concentrations. 3. Electron-attracting substituents decreased the Km values for catechols. 4. Results from binding studies with substituted catechols demonstrated narrow stereospecificities of pyrocatechase I from pseudomonas sp. B 13 and the pyrocatechase from alcaligenes eutrophus B.9. In contrast, a low steric hindrance by substituents in the binding of catechols with pyrocatechase II was observed. 5. Low pK'1 values of substituted catechols resulted in low Michaelis constants. 6. Electron-attracting substituents such as halogen decreased the reaction rates of catechol 1,2-dioxygenation. The correlation of the Vmax. values observed with pyrocatechase II from Pseudomonas sp. B 13 with the substituent constant sigma+ (Okamoto--Brown equation) was distinctly greater than with Hammett's sigma values. The corresponding logVmax. against sigma+ correlation for pyrocatechase I was considerably disturbed by steric influences of the substituents. | lld:pubmed |
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| pubmed-article:697766 | pubmed:language | eng | lld:pubmed |
| pubmed-article:697766 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:697766 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:697766 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:697766 | pubmed:month | Jul | lld:pubmed |
| pubmed-article:697766 | pubmed:issn | 0264-6021 | lld:pubmed |
| pubmed-article:697766 | pubmed:author | pubmed-author:KnackmussH... | lld:pubmed |
| pubmed-article:697766 | pubmed:author | pubmed-author:GRAYJ WJW | lld:pubmed |
| pubmed-article:697766 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:697766 | pubmed:day | 15 | lld:pubmed |
| pubmed-article:697766 | pubmed:volume | 174 | lld:pubmed |
| pubmed-article:697766 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:697766 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:697766 | pubmed:pagination | 85-94 | lld:pubmed |
| pubmed-article:697766 | pubmed:dateRevised | 2009-11-18 | lld:pubmed |
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| pubmed-article:697766 | pubmed:year | 1978 | lld:pubmed |
| pubmed-article:697766 | pubmed:articleTitle | Chemical structure and biodegradability of halogenated aromatic compounds. Substituent effects on 1,2-dioxygenation of catechol. | lld:pubmed |
| pubmed-article:697766 | pubmed:publicationType | Journal Article | lld:pubmed |
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