A novel variant of human superoxide dismutase 1 harboring amyotrophic lateral sclerosis-associated and experimental mutations in metal-binding residues and free cysteines lacks toxicity in vivo.

Journal of Neurochemistry
Mercedes PrudencioDavid R Borchelt

Abstract

Mutations in superoxide dismutase 1 (SOD1) cause familial amyotrophic lateral sclerosis. The Cu-binding capacity of SOD1 has spawned hypotheses that implicate metal-mediated production of reactive species as a potential mechanism of toxicity. In past experiments, we have tested such hypotheses by mutating residues in SOD1 that normally coordinate the binding of Cu, finding that such mutants retain the capacity to induce motor neuron disease. We now describe the lack of disease in mice that express a variant of human SOD1 in which residues that coordinate the binding of Cu and Zn have been mutated (SODMD). SODMD encodes three disease-causing and four experimental mutations that ultimately eliminate all histidines involved in the binding of metals; and includes one disease-causing and one experimental mutation that eliminate secondary metal binding at C6 and C111. We show that the combined effect of these mutations produces a protein that is unstable but does not aggregate on its own, is not toxic, and does not induce disease when co-expressed with high levels of wild-type SOD1. In cell culture models, we determine that the combined mutation of C6 and C111 to G and S, respectively, dramatically reduces the aggregation propensity ...Continue Reading

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Sep 28, 2010·Human Molecular Genetics·Mercedes PrudencioDavid R Borchelt

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Citations

May 19, 2012·Human Molecular Genetics·Matthis SynofzikPeter M Andersen
Jun 19, 2015·Biochemical and Biophysical Research Communications·Mariko OgawaYoshiaki Furukawa
Oct 12, 2013·Biotechnology and Bioengineering·Simpson GregoireInchan Kwon
Jul 2, 2014·Frontiers in Aging Neuroscience·Megan W BourassaLisa M Miller
Jun 5, 2016·The Journal of Biological Chemistry·Cristina Álvarez-ZaldiernasArne Holmgren
Aug 20, 2020·Translational Neurodegeneration·Yoshiaki Furukawa, Eiichi Tokuda
Aug 7, 2014·The Journal of Biological Chemistry·Carles SolsonaJorge Alegre-Cebollada
Feb 15, 2020·Molecular and Cellular Biochemistry·Aron Workman

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