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Glucosyltransferase

Glucosyltransferases are a type of Glycosyltransferase that enable the transfer of glucose.

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Glucuronate reductase

Glucuronate reductase (EC 1.1.1.19) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is L-gulonate:NADP+ 6-oxidoreductase. This enzyme participates in pentose and glucuronate interconversions and ascorbate and aldarate metabolism.

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Glucuronolactone reductase

Glucuronolactone reductase (EC 1.1.1.20) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is L-gulono-1,4-lactone:NADP+ 1-oxidoreductase. This enzyme participates in ascorbate and aldarate metabolism.

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Glucuronosyltransferase

Uridine 5'-diphospho-glucuronosyltransferase (UDP-glucuronosyltransferase, UGT) is a glycosyltransferase (EC 2.4.1.17) that catalyzes the glucuronidation reaction.

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Glutamate Dehydrogenase

Glutamate Dehydrogenase is an enzyme, present in most microbes and the mitochondria of eukaryotes, as are some of the other enzymes required for urea synthesis, that converts glutamate to α-ketoglutarate, and vice versa. In animals, the produced ammonia is usually used as a substrate in the urea cycle. Glutamate Dehydrogenase also has a very low affinity for ammonia and therefore toxic levels of ammonia would have to be present in the body for the reverse reaction to proceed (that is, α-ketoglutarate and ammonia to glutamate and NAD(P)+). It plays an important role in the differential diagnosis of liver disease, especially in combination with aminotransferases. Glutamate Dehydrogenase is localized in mitochondria, therefore practically none is liberated in generalised inflammatory diseases of the liver such as viral hepatitides.Glutamate Dehydrogenase is important for distinguishing between acute viral hepatitis and acute toxic liver necrosis or acute hypoxic liver disease, particularly in the case of liver damage with very high aminotransferases.

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Glutamate decarboxylase

Glutamate decarboxylase or glutamic acid decarboxylase (GAD) is an enzyme that catalyzes the decarboxylation of glutamate to GABA and CO2. GAD uses PLP as a cofactor.

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Glutamine synthetase

Glutamine synthetase (GS) (EC 6.3.1.2)[3] is an enzyme that plays an essential role in the metabolism of nitrogen by catalyzing the condensation of glutamate and ammonia to form glutamine.Glutamine Synthetase uses ammonia produced by nitrate reduction, amino acid degradation, and photorespiration. The amide group of glutamate is a nitrogen source for the synthesis of glutamine pathway metabolites.

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Glutathione S-transferase

Glutathione S-transferase (GST) family are composed of many cytosolic, mitochondrial, and microsomal proteins. GSTs are present in eukaryotes and in prokaryotes, where they catalyze a variety of reactions and accept endogenous and xenobiotic substrates.

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Glutathione reductase

Glutathione reductase, also known as GSR or GR, is an enzyme (EC 1.8.1.7) that reduces glutathione disulfide (GSSG) to the sulfhydryl form GSH, which is an important cellular antioxidant. glutathione reduction is performed by either the thioredoxin or the trypanothione system, respectively.

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Glutathione-CoA-glutathione transhydrogenase

Glutathione---CoA-glutathione transhydrogenase (EC 1.8.4.3) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with a disulfide as acceptor. The systematic name of this enzyme class is CoA:glutathione-disulfide oxidoreductase. This enzyme participates in cysteine metabolism and glutathione metabolism.

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