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The proton-translocating NADH:ubiquinone oxidoreductase or complex I is located in the inner membranes of mitochondria, where
it catalyzes the transfer of electrons from NADH to ubiquinone. Here we report that one of the subunits in complex I is homologous
to short-chain dehydrogenases and reductases, a family of enzymes with diverse activities that include metabolizing steroids,
prostaglandins and nucleotide sugars. We discovered that a subunit of complex I in human, cow, Neurospora crassa and Aquifex aeolius is homologous to nucleotide-sugar epimerases and hydroxysteroid dehydrogenases while seeking distant homologs of these enzymes
with a hidden Markov model-based search of Genpept. This homology allows us to use information from the solved three-dimensional
structures of nucleotide-sugar epimerases and hydroxysteroid dehydrogenases and our motif analysis of these enzymes to predict
functional domains on their homologs in complex I.
Received 26 November 1998; received after revision 12 January 1999; accepted 12 January 1999 相似文献
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