| Structural highlights
Function
EFE_PSESH Simultaneously catalyzes two reactions, namely formation of ethylene and of succinate from 2-oxoglutarate, with a molar ratio of 2:1.[1]
Publication Abstract from PubMed
Ethylene is important in industry and biological signaling. In plants, ethylene is produced by oxidation of 1-aminocyclopropane-1-carboxylic acid, as catalyzed by 1-aminocyclopropane-1-carboxylic acid oxidase. Bacteria catalyze ethylene production, but via the four-electron oxidation of 2-oxoglutarate to give ethylene in an arginine-dependent reaction. Crystallographic and biochemical studies on the Pseudomonas syringae ethylene-forming enzyme reveal a branched mechanism. In one branch, an apparently typical 2-oxoglutarate oxygenase reaction to give succinate, carbon dioxide, and sometimes pyrroline-5-carboxylate occurs. Alternatively, Grob-type oxidative fragmentation of a 2-oxoglutarate-derived intermediate occurs to give ethylene and carbon dioxide. Crystallographic and quantum chemical studies reveal that fragmentation to give ethylene is promoted by binding of l-arginine in a nonoxidized conformation and of 2-oxoglutarate in an unprecedented high-energy conformation that favors ethylene, relative to succinate formation.
Structural and stereoelectronic insights into oxygenase-catalyzed formation of ethylene from 2-oxoglutarate.,Zhang Z, Smart TJ, Choi H, Hardy F, Lohans CT, Abboud MI, Richardson MSW, Paton RS, McDonough MA, Schofield CJ Proc Natl Acad Sci U S A. 2017 May 2;114(18):4667-4672. doi:, 10.1073/pnas.1617760114. Epub 2017 Apr 18. PMID:28420789[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Fukuda H, Ogawa T, Tazaki M, Nagahama K, Fujii T, Tanase S, Morino Y. Two reactions are simultaneously catalyzed by a single enzyme: the arginine-dependent simultaneous formation of two products, ethylene and succinate, from 2-oxoglutarate by an enzyme from Pseudomonas syringae. Biochem Biophys Res Commun. 1992 Oct 30;188(2):483-9. PMID:1445291
- ↑ Zhang Z, Smart TJ, Choi H, Hardy F, Lohans CT, Abboud MI, Richardson MSW, Paton RS, McDonough MA, Schofield CJ. Structural and stereoelectronic insights into oxygenase-catalyzed formation of ethylene from 2-oxoglutarate. Proc Natl Acad Sci U S A. 2017 May 2;114(18):4667-4672. doi:, 10.1073/pnas.1617760114. Epub 2017 Apr 18. PMID:28420789 doi:http://dx.doi.org/10.1073/pnas.1617760114
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