Proteasome inhibition enhances the stability of mouse [formula omitted] superoxide dismutase with mutations linked to familial amyotrophic lateral sclerosis
Point mutations occurring within the Cu Zn superoxide dismutase ( SOD1) gene have been implicated in the etiology of some cases of familial amyotrophic lateral sclerosis (FALS). In order to better understand the functional consequences of these mutations, we have introduced FALS mutations into the m...
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Published in | Journal of the neurological sciences Vol. 139; no. 1; pp. 15 - 20 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
1996
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Subjects | |
Online Access | Get full text |
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Summary: | Point mutations occurring within the
Cu
Zn
superoxide dismutase (
SOD1) gene have been implicated in the etiology of some cases of familial amyotrophic lateral sclerosis (FALS). In order to better understand the functional consequences of these mutations, we have introduced FALS mutations into the mouse
SOD1 gene and studied the expression of the mutant templates in stably transformed cell lines. Pulse-chase analyses of lysates derived from cell lines stably expressing the
Cu
Zn
SOD isoforms indicate that the FALS mutant
Cu
Zn
SOD proteins are turned over more rapidly than wild-type SOD. Protease inhibitors specific for the major intracellular proteolytic activities were used to characterize the degradative pathways involved in the turnover of mutant
Cu
Zn
SOD. Inhibition of the chymotrypsin-like activity of the proteasome (also known as multicatalytic proteinase or ubiquitin, ATP-dependent proteinase) by a synthetic dipeptide aldehyde led to a significant increase in levels of the mutant
Cu
Zn
SOD implicating this proteolytic pathway in the turnover of the FALS mutant SOD proteins. |
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ISSN: | 0022-510X 1878-5883 |
DOI: | 10.1016/0022-510X(96)00031-7 |