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Heavy Metals and Metalloids As a Cause for Protein Misfolding and Aggregation

Journal article
Authors Markus J. Tamás
Sandeep K. Sharma
Sebastian Ibstedt
Therese Jacobson
Philipp Christen
Published in Biomolecules
Volume 4
Issue 1
Pages 252-267
ISSN 2218-273X
Publication year 2014
Published at Department of Chemistry and Molecular Biology
Pages 252-267
Language en
Links dx.doi.org/10.3390/biom4010252
Keywords protein folding; protein aggregation; chaperone; protein degradation; protein; metal toxicity; metalloid toxicity; yeast
Subject categories Microbiology, Toxicology, Cell and molecular biology, Biochemistry and Molecular Biology

Abstract

While the toxicity of metals and metalloids, like arsenic, cadmium, mercury, lead and chromium, is undisputed, the underlying molecular mechanisms are not entirely clear. General consensus holds that proteins are the prime targets; heavy metals interfere with the physiological activity of specific, particularly susceptible proteins, either by forming a complex with functional side chain groups or by displacing essential metal ions in metalloproteins. Recent studies have revealed an additional mode of metal action targeted at proteins in a non-native state; certain heavy metals and metalloids have been found to inhibit the in vitro refolding of chemically denatured proteins, to interfere with protein folding in vivo and to cause aggregation of nascent proteins in living cells. Apparently, unfolded proteins with motile backbone and side chains are considerably more prone to engage in stable, pluridentate metal complexes than native proteins with their well-defined 3D structure. By interfering with the folding process, heavy metal ions and metalloids profoundly affect protein homeostasis and cell viability. This review describes how heavy metals impede protein folding and promote protein aggregation, how cells regulate quality control systems to protect themselves from metal toxicity and how metals might contribute to protein misfolding disorders.

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