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EC 1.1.1.42 Details
EC number
1.1.1.42
Accepted name
isocitrate dehydrogenase (NADP+)
Reaction
isocitrate + NADP+ = 2-oxoglutarate + CO2 + NADPH + H+ (overall reaction);;(1a) isocitrate + NADP+ = oxalosuccinate + NADPH + H+;;(1b) oxalosuccinate = 2-oxoglutarate + CO2
Other name(s)
oxalosuccinate decarboxylase, oxalsuccinic decarboxylase, isocitrate (NADP) dehydrogenase, isocitrate (nicotinamide adenine dinucleotide phosphate) dehydrogenase, NADP-specific isocitrate dehydrogenase, NADP-linked isocitrate dehydrogenase, NADP-dependent isocitrate dehydrogenase, NADP isocitric dehydrogenase, isocitrate dehydrogenase (NADP-dependent), NADP-dependent isocitric dehydrogenase, triphosphopyridine nucleotide-linked isocitrate dehydrogenase-oxalosuccinate carboxylase, NADP+-linked isocitrate dehydrogenase, IDH (ambiguous), dual-cofactor-specific isocitrate dehydrogenase, NADP+-ICDH, NADP+-IDH, IDP, IDP1, IDP2, IDP3
Systematic name
isocitrate:NADP+ oxidoreductase (decarboxylating)
CAS registry number
9028-48-2
Comment
Requires Mn2+ or Mg2+ for activity. Unlike EC 1.1.1.41, isocitrate dehydrogenase (NAD+), oxalosuccinate can be used as a substrate. In eukaryotes, isocitrate dehydrogenase exists in two forms: an NAD+-linked enzyme found only in mitochondria and displaying allosteric properties, and a non-allosteric, NADP+-linked enzyme that is found in both mitochondria and cytoplasm [6]. The enzyme from some species can also use NAD+ but much more slowly [6,7].
History
created 1961, modified 2005
EC Tree
1.1.1.68 created 1965, deleted 1978 [transferred to EC 1.1.99.15, deleted 1980]
1.1.1.70 created 1965, deleted 1978
1.1.1.74 created 1972, deleted 1976
1.1.1.89 created 1972, deleted 1976
1.1.1.109 created 1972, deleted 1976
1.1.1.139 created 1972, deleted 1978
1.1.1.155 created 1976, deleted 2004
1.1.1.171 created 1978, deleted 1984
1.1.1.180 created 1983, deleted 1984
1.1.1.182 created 1983, deleted 1990
1.1.1.204 created 1972 as EC 1.2.1.37, transferred 1984 to EC 1.1.1.204, modified 1989, deleted 2004
1.1.1.242 created 1992, deleted 2001
1.1.1.249 provisional version created 1999, deleted 1999 (reinstated 2001 as EC 2.5.1.46)
1.1.1.253 created 1999, deleted 2003
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003