The ATP:Co(I)rrinoid Adenosyltransferase (CobA) Enzyme ofSalmonella enterica Requires the 2′-OH Group of ATP for Function and Yields Inorganic Triphosphate as Its Reaction Byproduct
| Autor: | Maris V. Fonseca, Jorge C. Escalante-Semerena, Nicole R. Buan, Ivan Rayment, Alexander R. Horswill |
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| Rok vydání: | 2002 |
| Předmět: |
Models
Molecular Magnetic Resonance Spectroscopy Cleavage (embryo) Biochemistry Pyrophosphate Catalysis Substrate Specificity chemistry.chemical_compound Adenosine Triphosphate Corrinoid Bacterial Proteins Nucleotide Binding site Molecular Biology chemistry.chemical_classification Alkyl and Aryl Transferases Binding Sites Dose-Response Relationship Drug biology Salmonella enterica Cell Biology biology.organism_classification Enzyme Models Chemical chemistry Adenosine triphosphate Protein Binding |
| Zdroj: | Journal of Biological Chemistry. 277:33127-33131 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m203893200 |
| Popis: | The specificity of the ATP:corrinoid adenosyltransferase (CobA) enzyme of Salmonella enterica serovar Typhimurium LT2 for its nucleotide substrate was tested using ATP analogs and alternative nucleotide donors. The enzyme showed broad specificity for the nucleotide base and required the 2'-OH group of the ribosyl moiety of ATP for activity. (31)P NMR spectroscopy was used to identify inorganic triphosphate (PPP(i)) as the byproduct of the reaction catalyzed by the CobA enzyme. Cleavage of triphosphate into pyrophosphate and orthophosphate did not occur, indicating that triphosphate cleavage was not required for release of the adenosylcorrinoid product. Triphosphate was a strong inhibitor of the reaction, with 85% of CobA activity lost when the ATP/PPP(i) ratio present in the reaction mixture was 1:2.5. |
| Databáze: | OpenAIRE |
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