Post-translational transport of proteins into microsomal membranes of Candida maltosa. |
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Authors: | M Wiedmann B Wiedmann S Voigt E Wachter H G Müller and T A Rapoport |
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Institution: | Zentralinstitut für Molekularbiologie, Akademie der Wissenschaften der DDR, Berlin-Buch. |
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Abstract: | We have isolated from the yeast Candida maltosa microsomal membranes that are active in the translocation of proteins synthesized in cell-free systems derived from C. maltosa, Saccharomyces cerevisiae or wheat germ. Translocation and core glycosylation of prepro-alpha-factor, a secretory protein, were observed with yeast microsomes added during or after translation. The signal peptide is cleaved off. Cytochrome P-450 from C. maltosa, the first integral membrane protein studied in a yeast system, is also inserted both co- and post-translationally into Candida microsomal membranes. Its insertion into canine microsomes occurs efficiently only in a co-translational manner and is dependent on the function of the signal recognition particle. |
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