KMID : 0620920090410090611
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Experimental & Molecular Medicine 2009 Volume.41 No. 9 p.611 ~ p.617
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Intracellular amyloid beta interacts with SOD1 and impairs the enzymatic activity of SOD1: implications for the pathogenesis of amyotrophic lateral sclerosis
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Yoon Eun-Jin
Jang Ja-Young Kang Seong-Man Kim Goo-Young Rhim Hyang-Shuk Park Hyo-Jin Cho Hyung-Min Choi Jung-Ha Park Hye-Yoon
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Abstract
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Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease caused by the degeneration of motor neurons. Mutations in Cu/Zn superoxide dismutase (SOD1), including G93A, were reportedly linked to familial ALS. SOD1 is a key antioxidant enzyme, and is also one of the major targets for oxidative damage in the brains of patients suffering from Alzheimer¡¯s disease (AD). Several lines of evidence suggest that intracellular amyloid beta (A¥â) is associated with the pathogenesis of AD. In this report we demonstrate that intracellular A¥â directly interacts with SOD1, and that this interaction decreases the enzymatic activity of the enzyme. We observed A¥â-SOD1 aggregates in the perinuclear region of H4 cells, and mapped the SOD1 binding region to A¥â amino acids 26-42. Interestingly, intracellular A¥â binds to the SOD1 G93A mutant with greater affinity than to wild-type SOD1. This resulted in considerably less mutant enzymatic activity. Our study implicates a potential role for A¥â in the development of ALS by interacting with the SOD1 G93A mutant.
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KEYWORD
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Alzheimer disease, amyloid ¥â-protein, amyotrophic lateral sclerosis, enzymology, protein interaction domains and motifs, superoxide dismutase 1
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