Mechanism of peroxidasin inactivation in hyperglycemia: Heme damage by reactive oxygen species.

ABSTRACT: Diabetic complications present a serious health problem. Functional damage to proteins due to post-translational modifications by glycoxidation reactions is a known factor contributing to pathology. Extracellular proteins are especially vulnerable to diabetic damage because robust antioxidant defenses are lacking outside the cell. We investigated glucose-induced inactivation of peroxidasin (PXDN), a heme protein catalyzing sulfilimine crosslinking of collagen IV that reinforce the basement membranes (BM). Experiments using physiological diabetic glucose levels were carried out to exclude several potential mechanisms of PXDN inactivation i.e., direct adduction of glucose, reactive carbonyl damage, steric hindrance, and osmotic stress. Further experiments established that PXDN activity was i

SUBMITTER: Ivanov SV 

PROVIDER: S-EPMC10702573 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature