A 42K outer-membrane protein is a component of the yeast mitochondrial protein import site

@article{Vestweber1989A4O,
  title={A 42K outer-membrane protein is a component of the yeast mitochondrial protein import site},
  author={Dietmar Vestweber and Josef Brunner and Alison Baker and Gottfried Schatz},
  journal={Nature},
  year={1989},
  volume={341},
  pages={205-209}
}
An engineered precursor protein that sticks in the import site of isolated yeast mitochondria can be specifically photo-crosslinked to a mitochondrial outer-membrane protein of relative molecular mass 42,000 (42K). This protein (termed import-site protein 42 or ISP 42) is exposed on the mitochondrial surface; antibodies against it block protein import into mitochondria. ISP 42 is the first identified component of the putative transmembrane machinery that imports proteins into mitochondria. 

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