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Inhibition of protein translocation across the endoplasmic reticulum membrane by sterols
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Texas A & M University System Health Science Center, Texas.
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2001 (English)In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 276, no 45, 41748-41754 p.Article in journal (Refereed) Published
Abstract [en]

Cholesterol and related sterols are known to modulate the physical properties of biological membranes and can affect the activities of membrane-bound protein complexes. Here, we report that an early step in protein translocation across the endoplasmic reticulum (ER) membrane is reversibly inhibited by cholesterol levels significantly lower than those found in the plasma membrane. By UV-induced chemical cross-linking we further show that high cholesterol levels prevent cross-linking between ribosome-nascent chain complexes and components of the Sec61 translocon, but have no effect on cross-linking to the signal recognition particle. The inhibiting effect on translocation is different between different sterols. Our data suggest that the protein translocation machinery may be sensitive to changes in cholesterol levels in the ER membrane.

Place, publisher, year, edition, pages
2001. Vol. 276, no 45, 41748-41754 p.
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Biochemistry and Molecular Biology
URN: urn:nbn:se:su:diva-21424DOI: 10.1074/jbc.M105823200ISI: 000172450400029PubMedID: 11535595OAI: diva2:187951
Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2016-02-24Bibliographically approved

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Nilsson, IngMarievon Heijne, Gunnar
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