Abstract
Isolated outer chloroplast envelope membranes were solubilized by digitonin and separated on linear sucrose density gradients. A membrane complex was recovered from the gradients and exhibited characteristics of a protein import apparatus, i.e. the interaction of the complex with the precursor polypeptides depends on the presence of a transit sequence, ATP and protease‐sensitive components. Furthermore, trans‐location intermediates detected in the organellar system are also found after interaction of the precursor polypeptide with the isolated import complex.
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