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EC 1.1.5.3 Details
EC number
1.1.5.3
Accepted name
glycerol-3-phosphate dehydrogenase
Reaction
sn-glycerol 3-phosphate + a quinone = glycerone phosphate + a quinol
Other name(s)
α-glycerophosphate dehydrogenase, α-glycerophosphate dehydrogenase (acceptor), anaerobic glycerol-3-phosphate dehydrogenase, DL-glycerol 3-phosphate oxidase (misleading), FAD-dependent glycerol-3-phosphate dehydrogenase, FAD-dependent sn-glycerol-3-phosphate dehydrogenase, FAD-GPDH, FAD-linked glycerol 3-phosphate dehydrogenase, FAD-linked L-glycerol-3-phosphate dehydrogenase, flavin-linked glycerol-3-phosphate dehydrogenase, flavoprotein-linked L-glycerol 3-phosphate dehydrogenase, glycerol 3-phosphate cytochrome c reductase (misleading), glycerol phosphate dehydrogenase, glycerol phosphate dehydrogenase (acceptor), glycerol phosphate dehydrogenase (FAD), glycerol-3-phosphate CoQ reductase, glycerol-3-phosphate dehydrogenase (flavin-linked), glycerol-3-phosphate:CoQ reductase, glycerophosphate dehydrogenase, L-3-glycerophosphate-ubiquinone oxidoreductase, L-glycerol-3-phosphate dehydrogenase (ambiguous), L-glycerophosphate dehydrogenase, mGPD, mitochondrial glycerol phosphate dehydrogenase, NAD+-independent glycerol phosphate dehydrogenase, pyridine nucleotide-independent L-glycerol 3-phosphate dehydrogenase, sn-glycerol 3-phosphate oxidase (misleading), sn-glycerol-3-phosphate dehydrogenase, sn-glycerol-3-phosphate:(acceptor) 2-oxidoreductase, sn-glycerol-3-phosphate:acceptor 2-oxidoreductase
Systematic name
sn-glycerol 3-phosphate:quinone oxidoreductase
CAS registry number
9001-49-4
Comment
This flavin-dependent dehydrogenase is an essential membrane enzyme, functioning at the central junction of glycolysis, respiration and phospholipid biosynthesis. In bacteria, the enzyme is localized to the cytoplasmic membrane [6], while in eukaryotes it is tightly bound to the outer surface of the inner mitochondrial membrane [2]. In eukaryotes, this enzyme, together with the cytosolic enzyme EC 1.1.1.8, glycerol-3-phosphate dehydrogenase (NAD+), forms the glycerol-3-phosphate shuttle by which NADH produced in the cytosol, primarily from glycolysis, can be reoxidized to NAD+ by the mitochondrial electron-transport chain [3]. This shuttle plays a critical role in transferring reducing equivalents from cytosolic NADH into the mitochondrial matrix [7,8]. Insect flight muscle uses only CoQ10 as the physiological quinone whereas hamster and rat mitochondria use mainly CoQ9 [4]. The enzyme is activated by calcium [3].
History
created 1961 as EC 1.1.2.1, transferred 1965 to EC 1.1.99.5, transferred 2009 to EC 1.1.5.3
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
1.1.5.1 created 1983, deleted 2002