ExplorEnz: EC 1.2.1.105

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1.2.1.105

Accepted name:

2-oxoglutarate dehydrogenase system

Reaction:

2-oxoglutarate + CoA + NAD⁺ = succinyl-CoA + CO₂ + NADH

Other name(s):

2-oxoglutarate dehydrogenase complex

Systematic name:

2-oxoglutarate:NAD⁺ 2-oxidoreductase (CoA-succinylating)

Comments:

The 2-oxoglutarate dehydrogenase system is a large enzyme complex that belongs to the 2-oxoacid dehydrogenase system family, which also includes EC 1.2.1.25, branched-chain α-keto acid dehydrogenase system, EC 1.2.1.104, pyruvate dehydrogenase system, EC 1.4.1.27, glycine cleavage system, and EC 2.3.1.190, acetoin dehydrogenase system. With the exception of the glycine cleavage system, which contains 4 components, the 2-oxoacid dehydrogenase systems share a common structure, consisting of three main components, namely a 2-oxoacid dehydrogenase (E1), a dihydrolipoamide acyltransferase (E2), and a dihydrolipoamide dehydrogenase (E3). This enzyme system converts 2-oxoglutarate to succinyl-CoA and produces NADH and CO₂ in a complicated series of irreversible reactions. The reaction catalysed by this system is the sum of three activities: EC 1.2.4.2, oxoglutarate dehydrogenase (succinyl-transferring) (E1), EC 2.3.1.61, dihydrolipoyllysine-residue succinyltransferase (E2) and EC 1.8.1.4, dihydrolipoyl dehydrogenase (E3).

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc

References:

1.	Robien, M.A., Clore, G.M., Omichinski, J.G., Perham, R.N., Appella, E., Sakaguchi, K. and Gronenborn, A.M. Three-dimensional solution structure of the E3-binding domain of the dihydrolipoamide succinyltransferase core from the 2-oxoglutarate dehydrogenase multienzyme complex of Escherichia coli. Biochemistry 31 (1992) 3463–3471. [DOI] [PMID: 1554728]
2.	Knapp, J.E., Mitchell, D.T., Yazdi, M.A., Ernst, S.R., Reed, L.J. and Hackert, M.L. Crystal structure of the truncated cubic core component of the Escherichia coli 2-oxoglutarate dehydrogenase multienzyme complex. J. Mol. Biol. 280 (1998) 655–668. [DOI] [PMID: 9677295]
3.	Reed, L.J. A trail of research from lipoic acid to α-keto acid dehydrogenase complexes. J. Biol. Chem. 276 (2001) 38329–38336. [DOI] [PMID: 11477096]
4.	Murphy, G.E. and Jensen, G.J. Electron cryotomography of the E. coli pyruvate and 2-oxoglutarate dehydrogenase complexes. Structure 13 (2005) 1765–1773. [DOI] [PMID: 16338405]
5.	Frank, R.A., Price, A.J., Northrop, F.D., Perham, R.N. and Luisi, B.F. Crystal structure of the E1 component of the Escherichia coli 2-oxoglutarate dehydrogenase multienzyme complex. J. Mol. Biol. 368 (2007) 639–651. [DOI] [PMID: 17367808]
6.	Bunik, V.I. and Degtyarev, D. Structure-function relationships in the 2-oxo acid dehydrogenase family: substrate-specific signatures and functional predictions for the 2-oxoglutarate dehydrogenase-like proteins. Proteins 71 (2008) 874–890. [DOI] [PMID: 18004749]
7.	Shim da, J., Nemeria, N.S., Balakrishnan, A., Patel, H., Song, J., Wang, J., Jordan, F. and Farinas, E.T. Assignment of function to histidines 260 and 298 by engineering the E1 component of the Escherichia coli 2-oxoglutarate dehydrogenase complex; substitutions that lead to acceptance of substrates lacking the 5-carboxyl group. Biochemistry 50 (2011) 7705–7709. [DOI] [PMID: 21809826]

[EC 1.2.1.105 created 2020]