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J. Biol. Chem., Vol. 276, Issue 42, 38808-38813, October 19, 2001
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,
,
,
¶
From the The gene for the single subunit,
rotenone-insensitive, and flavone-sensitive internal NADH-quinone
oxidoreductase of Saccharomyces cerevisiae
(NDI1) can completely restore the NADH dehydrogenase activity in mutant human cells that lack the essential mitochondrial DNA (mtDNA)-encoded subunit ND4. In particular, the
NDI1 gene was introduced into the nuclear genome of the
human 143B.TK
Division of Biology 156-29, California
Institute of Technology, Pasadena, California 91125 and the
§ Division of Biochemistry, Department of Molecular and
Experimental Medicine, The Scripps Research Institute, La Jolla,
California 92037
cell line derivative C4T, which carries a
homoplasmic frameshift mutation in the ND4 gene. Two
transformants with a low or high level of expression of the exogenous
gene were chosen for a detailed analysis. In these cells the
corresponding protein is localized in mitochondria, its NADH-binding
site faces the matrix compartment as in yeast mitochondria, and in
perfect correlation with its abundance restores partially or fully
NADH-dependent respiration that is rotenone-insensitive,
flavone-sensitive, and antimycin A-sensitive. Thus the yeast enzyme has
become coupled to the downstream portion of the human respiratory
chain. Furthermore, the P:O ratio with
malate/glutamate-dependent respiration in the transformants is approximately two-thirds of that of the wild-type
143B.TK
cells, as expected from the lack of proton
pumping activity in the yeast enzyme. Finally, whereas the
original mutant cell line C4T fails to grow in medium containing
galactose instead of glucose, the high NDI1-expressing
transformant has a fully restored capacity to grow in galactose medium.
The present observations substantially expand the potential of the
yeast NDI1 gene for the therapy of mitochondrial diseases
involving complex I deficiency.
Present address: Dept. Cell. Struct. Biology, University of
Texas HSC, San Antonio, TX 78229-3900.
¶
To whom correspondence should be addressed. Tel.:
626-395-4930; Fax: 626-449-0756; E-mail: attardi@caltech.edu.
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