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NADH dehydrogenase [ubiquinone] iron-sulfur protein 7, mitochondrial, also knowns as NADH-ubiquinone oxidoreductase 20 kDa subunit, Complex I-20kD (CI-20kD), or PSST subunit is an enzyme that in humans is encoded by the NDUFS7 gene. The PSST subunit encoded by the NDUSF7 gene is one of over 40 subunits involved in the transfer of electrons from NADH to ubiquinone. Specifically, it is thought that the PSST subunit directly couples electron transfer between the iron-sulfur cluster N2 and ubiquinone, along with ubiquinone-binding ND1.Functional evidence for the importance of PSST has been garnered from mutational studies in the obligate aerobic yeast, Yarrow lipolytic, which elucidated a central role in proton translocation that was reduced in mutant forms of the subunit.
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