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This reaction is the rate-limiting step in glutathione synthesis. [3] Second, glycine is added to the C-terminal of γ-glutamylcysteine. This condensation is catalyzed by glutathione synthetase. While all animal cells are capable of synthesizing glutathione, glutathione synthesis in the liver has been shown to be essential.
Glutathione synthetase (GSS) (EC 6.3.2.3) is the second enzyme in the glutathione (GSH) biosynthesis pathway. It catalyses the condensation of gamma-glutamylcysteine and glycine, to form glutathione. [2] Glutathione synthetase is also a potent antioxidant. It is found in many species including bacteria, yeast, mammals, and plants. [3]
Glutamate–cysteine ligase (GCL) EC 6.3.2.2), previously known as γ-glutamylcysteine synthetase (GCS), is the first enzyme of the cellular glutathione (GSH) biosynthetic pathway that catalyzes the chemical reaction: L-glutamate + L-cysteine + ATP γ-glutamyl cysteine + ADP + P i
Gamma-glutamyltransferase (also γ-glutamyltransferase, GGT, gamma-GT, gamma-glutamyl transpeptidase; [1] EC 2.3.2.2) is a transferase (a type of enzyme) that catalyzes the transfer of gamma-glutamyl functional groups from molecules such as glutathione to an acceptor that may be an amino acid, a peptide or water (forming glutamate).
The biosynthetic pathways of synthesis of γ-glutamylpeptides and alliins are still ambiguous. γ-Glutamylpeptides can be formed from cysteine (via γ-glutamylcysteine or glutathione) and can be metabolized into the corresponding alliins via oxidation and subsequent hydrolyzation by γ-glutamyl transpeptidases.
The attack of the glutathione would leave a charged O – and the aldehyde hydrogen bound to C 1. If the carbonyl oxygen of C 2 can secure a hydrogen from an obliging acidic sidechain of the enzyme, forming an alcohol, then the hydrogen of C 1 might simultaneously slide over with its electrons onto C 2 (the hydride transfer).
Buthionine sulfoximine (BSO) is a sulfoximine derivative which reduces levels of glutathione and is being investigated as an adjunct with chemotherapy in the treatment of cancer. [1] The compound inhibits gamma-glutamylcysteine synthetase, the enzyme required in the first step of glutathione synthesis.
14629 Ensembl ENSG00000001084 ENSMUSG00000032350 UniProt P48506 P97494 RefSeq (mRNA) NM_001498 NM_001197115 NM_010295 RefSeq (protein) NP_001184044 NP_001489 NP_034425 Location (UCSC) Chr 6: 53.5 – 53.62 Mb Chr 9: 77.66 – 77.7 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Glutamate–cysteine ligase catalytic subunit is an enzyme that in humans is encoded by the GCLC gene ...