Glutaredoxin system

The **glutaredoxin system** comprises a family of small redox enzymes known as **glutaredoxins** (also called thioltransferases), which use glutathione as a cofactor to catalyze reversible protein S-glutathionylation reactions. These enzymes play essential roles in maintaining cellular redox balance by regulating the ratio between reduced and oxidized glutathione. They participate in antioxidant defense by reducing disulfide bonds in proteins damaged by reactive oxygen species and are involved in key processes such as DNA synthesis via their role with ribonucleotide reductase. The human genome encodes several isoforms including GLRX, GLRX2, GLRX3, and GLRX5. The broader "system" includes not only these enzymes but also their cofactors—primarily reduced/oxidized forms of glutathione—and associated metabolic pathways that regenerate these molecules. Dysfunction or dysregulation of the glutaredoxin system is implicated in various diseases characterized by oxidative stress including cancer, neurodegeneration, cardiovascular disorders, inflammation, and others[1][2][4].

Other names

GlutaredoxinsThioltransferaseGRXGrx system

Drugs or molecules targeting this system would typically act by modulating redox balance, inhibiting or enhancing protein glutathionylation/deglutathionylation, or altering antioxidant capacity within cells.