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. 1980 Feb 1;185(2):315–326. doi: 10.1042/bj1850315

The organization of NADH dehydrogenase polypeptides in the inner mitochondrial membrane.

S Smith, C I Ragan
PMCID: PMC1161357  PMID: 7396818

Abstract

The organization of the constituent polypeptides of mitochondrial NADH dehydrogenase was studied by using two membrane-impermeable probes, diazobenzene[35S]sulphonate and lactoperoxidase-catalysed radioiodination. The incorporation of label into the subunits of the isolated enzyme was compared with that obtained with enzyme immunoprecipitated from labelled mitochondria or inverted submitochondrial particles. On the basis of accessibility to these two labels, we divide the polypeptides of Complex I into five groups: those that are apparently buried in the enzyme, those that are accessible to labelling in the isolated enzyme but not in the membrane, those that are exposed on the cytoplasmic face of the membrane, those that are exposed on the matrix face and finally those that are exposed on both faces and are therefore transmembranous. We conclude that NADH dehydrogenase is asymmetrically organized across the inner mitochondrial membrane.

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Selected References

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