Glutathione biosynthesis enzyme

Glutathione biosynthesis enzymes refer primarily to two key enzymes responsible for the synthesis of the antioxidant tripeptide glutathione. The first step is catalyzed by glutamate–cysteine ligase (also known as γ-glutamylcysteine synthetase), which forms γ-glutamylcysteine from L-glutamate and L-cysteine. The second step is catalyzed by glutathione synthetase, which adds glycine to γ-glutamylcysteine to produce glutathione[1][3][5]. These enzymes are essential in maintaining cellular redox balance and protecting cells from reactive oxygen species and toxic compounds. Deficiencies in these enzymes can lead to severe metabolic disorders such as metabolic acidosis and hemolytic anemia in humans[1]. Overexpression or altered regulation has been implicated in cancer progression and drug resistance due to enhanced detoxification capacity[2]. Drugs targeting these enzymes aim either to modulate intracellular glutathione levels or exploit their activity for selective drug activation within tumors. Note on correctness: The term "Glutathione biosynthesis enzymes" is not a canonical name but rather refers collectively to at least two distinct targets—glutamate–cysteine ligase and glutathione synthetase—each with its own specific properties, gene names, abbreviations, inhibitors/activators, etc.[3][5] For structured data purposes it is preferable to specify one enzyme at a time; otherwise this entry may be considered too broad or ambiguous.

Other names

Glutamate–cysteine ligaseγ-glutamylcysteine synthetaseGlutathione synthetaseGCLGSGSS synthetase

Inhibition or modulation of enzyme activity to alter glutathione levels[1][2]