Secretory protein translocation in a yeast cell-free system can occur posttranslationally and requires ATP hydrolysis.

Abstract

We describe an in vitro system with all components derived from the yeast Saccharomyces cerevisiae that can translocate a yeast secretory protein across microsomal membranes. In vitro transcribed prepro-.alpha.-factor mRNA served to program a membrane-depleted yeast translation system. Translocation and core glycosylation of prepro-.alpha.-factor were observed when yeast microsomal membranes were added during or after translation. A membrane potential is not required for translocation. However, ATP is required for translocation and nonhydrolyzable analogues of ATP cannot serve as a substitute. These findings suggest that ATP hydrolysis may supply the energy required for translocation of proteins across the endoplasmic reticulum.