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Originally published In Press as doi:10.1074/jbc.M105296200 on August 10, 2001

J. Biol. Chem., Vol. 276, Issue 41, 38084-38089, October 12, 2001
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A Fraction of Yeast Cu,Zn-Superoxide Dismutase and Its Metallochaperone, CCS, Localize to the Intermembrane Space of Mitochondria
A PHYSIOLOGICAL ROLE FOR SOD1 IN GUARDING AGAINST MITOCHONDRIAL OXIDATIVE DAMAGE*

Lori A. SturtzDagger §, Kerstin Diekert, Laran T. JensenDagger , Roland Lill, and Valeria Cizewski CulottaDagger ||

From the Dagger  Department of Environmental Health Sciences, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland 21205 and the  Institut fur Zytobiologie der Philipps-Universitat Marburg, Robert-Koch-Str. 5, 35033 Marburg, Germany

Cu,Zn-superoxide dismutase (SOD1) is an abundant, largely cytosolic enzyme that scavenges superoxide anions. The biological role of SOD1 is somewhat controversial because superoxide is thought to arise largely from the mitochondria where a second SOD (manganese SOD) already resides. Using bakers' yeast as a model, we demonstrate that Cu,Zn-SOD1 helps protect mitochondria from oxidative damage, as sod1Delta mutants show elevated protein carbonyls in this organelle. In accordance with this connection to mitochondria, a fraction of active SOD1 localizes within the intermembrane space (IMS) of mitochondria together with its copper chaperone, CCS. Neither CCS nor SOD1 contains typical N-terminal presequences for mitochondrial uptake; however, the mitochondrial accumulation of SOD1 is strongly influenced by CCS. When CCS synthesis is repressed, mitochondrial SOD1 is of low abundance, and conversely IMS SOD1 is very high when CCS is largely mitochondrial. The mitochondrial form of SOD1 is indeed protective against oxidative damage because yeast cells enriched for IMS SOD1 exhibit prolonged survival in the stationary phase, an established marker of mitochondrial oxidative stress. Cu,Zn-SOD1 in the mitochondria appears important for reactive oxygen physiology and may have critical implications for SOD1 mutations linked to the fatal neurodegenerative disorder, amyotrophic lateral sclerosis.


* This work was supported in part by the Johns Hopkins University NIEHS center, by National Institutes of Health Grant GM50016 (to V. C.), and by funding from Sonderforschungsbereich 286 of the Deutsche Forschungsgemeinschaft, the Volkswagen-Stiftung, and Chemischen Industrie (to R. L.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

§ Supported by National Institutes of Health Training Grant ES 07141.

|| To whom correspondence should be addressed: Johns Hopkins University, 615 N. Wolfe Street, Room 7032, Baltimore, MD 21205. Tel.: 410-955-3029; Fax: 410-955-0116; E-mail: vculotta@jhsph.edu.


Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.
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