Protein N-homocysteinylation: From cellular toxicity to neurodegeneration

Biochimica Et Biophysica Acta
Gurumayum Suraj SharmaLaishram Rajendrakumar Singh

Abstract

Homocysteine (Hcy) is a sulfur containing non-protein amino acid that occupies a central role in metabolism of thiol compounds. The past decade had noticed an explosion in interests of Hcy and this very interest came primarily from the fact that increased Hcy level is related to various neurodegenerative and vascular complications. Several factors responsible for the Hcy-associated neurotoxicity have been proposed and well documented in literature, including oxidative stress and apoptosis. In addition, protein covalent modification by the metabolite of Hcy, Hcy thiolactone (HTL), has now been shown to be another cause of cellular Hcy toxicity. This mechanism, termed as "protein N-homocysteinylation", is known to result in protein denaturation, enzyme inactivation and even amyloid formation. The role of protein N-homocysteinylation and the resulting consequences with regard to neurodegeneration have not yet been extensively discussed. The present review describes major advances in understanding protein N-homocysteinylation and their role in neurodegeneration. Formation of protein aggregates/amyloids are crucial events in various human pathologies including neurodegenerative diseases. Since elevated Hcy has been closely linked to...Continue Reading

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