The critical role of methionine 35 in Alzheimer's amyloid beta-peptide (1-42)-induced oxidative stress and neurotoxicity.
Amyloid beta-peptide (1-42) [Abeta(1-42)] has been proposed to play a central role in the pathogenesis of Alzheimer's disease, a neurodegenerative disorder associated with cognitive decline and aging. AD brain is under extensive oxidative stress, and Abeta(1-42) has been shown to induce protein oxidation, lipid peroxidation, and reactive oxygen species formation in neurons and synaptosomes, all of which are inhibited by the antioxidant vitamin E. Additional studies have shown that Abeta(1-42) induces oxidative stress when expressed in vivo in Caenorhabditis elegans, but when methionine 35 is replaced by cysteine, the oxidative stress is attenuated. This finding coupled with in vitro studies using mutant peptides have demonstrated a critical role for methionine 35 in the oxidative stress and neurotoxic properties of Abeta(1-42). In this review, we discuss the role of methionine 35 in the oxidative stress and neurotoxicity induced by Abeta(1-42) and the implications of these findings in the pathogenesis of AD.
Butterfield
D Allan
DA
Department of Chemistry, Center for Membrane Sciences, University of Kentucky, Lexington, KY 40506-0055, USA. dabcns@uky.edu
Boyd-Kimball
Debra
D
D000595:Amino Acid Sequence; D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics; D006801:Humans; D008715:Methionine / Q000502:physiology*; D008969:Molecular Sequence Data; D018384:Oxidative Stress; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000502:physiology*
D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C075222:amyloid beta-protein (1-42); D008715:Methionine