MGST1

The MAPEG (Membrane Associated Proteins in Eicosanoid and Glutathione metabolism) family consists of six human proteins, two of which are involved in the production of leukotrienes and prostaglandin E, important mediators of inflammation. Other family members, demonstrating glutathione S-transferase and peroxidase activities, are involved in cellular defense against toxic, carcinogenic, and pharmacologically active electrophilic compounds. This gene encodes a protein that catalyzes the conjugation of glutathione to electrophiles and the reduction of lipid hydroperoxides. This protein is localized to the endoplasmic reticulum and outer mitochondrial membrane where it is thought to protect these membranes from oxidative stress. Several transcript variants, some non-protein coding and some protein coding, have been found for this gene.

MICROSOMAL GLUTATHIONE S-TRANSFERASE 1

Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles. Has a wide substrate specificity.

Cellular response to lipid hydroperoxide Source: UniProtKB
Glutathione transport Source: UniProtKB

Endoplasmic reticulum
Microsome
Endoplasmic reticulum membrane
Mitochondrion
Mitochondrion outer membrane

Lumenal: 3-9
Helical: 10-33
Cytoplasmic: 34-62
Helical: 63-96
Lumenal: 97-99
Helical: 100-123
Cytoplasmic: 124-128
Helical: 129-148
Lumenal: 149-155

Peroxynitrite induces nitration at Tyr-93 which activates the enzyme.