Abstract
We have isolated the F0F1-ATP synthase complex from oligomycin-sensitive mitochondria of the green algaChlamydomonas reinhardtii. A pure and active ATP synthase was obtained by eans of sonication, extraction with dodecyl maltoside and ion exchange and gel permeation chromatography in the presence of glycerol, DTT, ATP and-21. The enzyme consists of 14 subunits as judged by SDS-PAGE. A cDNA clone encoding the ATP synthase α subunit has been sequenced. The deduced protein sequence contains a presequence of 45 amino acids which is not present in the mature protein. The mature protein is 58–70% identical to corresponding mitochondrial proteins from other organisms. In contrast to the ATP synthase β subunit fromC. reinhardtii (Franzen and Falk, Plant Mol Biol 19 (1992) 771–780), the protein does not have a C-terminal extension. However, the N-terminal domain of the mature protein is 15–18 residues longer than in ATP synthase α subunits from other organisms. Southern blot analysis indicates that the protein is encoded by a single-copy gene.
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Abbreviations
- DM:
-
dodecyl-β-D-maltoside
- OSCP:
-
oligomycin sensitivity conferring protein
- PMSF:
-
phenyl-methylsulfonylfluoride
- DTT:
-
dithiothreitol
- EDTA:
-
ethylenediaminotetraacetic disodium salt
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Nurani, G., Franzén, LG. Isolation and characterization of the mitochondrial ATP synthase fromChlamydomonas reinhardtii. cDNA sequence and deduced protein sequence of the α subunit. Plant Mol Biol 31, 1105–1116 (1996). https://doi.org/10.1007/BF00040828
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DOI: https://doi.org/10.1007/BF00040828