| Modification Notes |
Glutathione is a tripeptide electron donor that functions as an antioxidant, protecting cells from toxins by reducing disulfide bonds during oxidative stress. The metabolism of Glutathione requires a variety of enzymes, such as GGT1, GGT2, GGT5, GGTLC2 and GGTL3. GGTL3, also known as GGT7 (©-glutamyltransferase 7), GGT4 or GGTL5, is a 662 amino acid single-pass type II membrane protein that belongs to the ©-glutamyltransferase family and is involved in the pathway of Glutathione metabolism. Expressed at low levels in multiple tissues, including lung, liver, heart, brain, testis and spleen, GGTL3 functions as a heterodimer of light and heavy chains that work together to cleave glutathione-conjugated peptides, thereby releasing an unconjugated protein. GGTL3 exists as multiple alternatively spliced isoforms and, via its catalytic activity, may be involved in the pathogenesis of lung cancer. |