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Membrane Protein Integration and Topogenesis at the ER

Spiess, Martin and Junne, Tina and Janoschke, Marco. (2019) Membrane Protein Integration and Topogenesis at the ER. The Protein Journal, 38 (3). pp. 306-316.

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Official URL: https://edoc.unibas.ch/71717/

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Abstract

Most membrane proteins are composed of hydrophobic α-helical transmembrane segments and are integrated into the lipid bilayer of the endoplasmic reticulum by the highly conserved Sec61 translocon. With respect to the integration mechanism, three types of transmembrane segments can be distinguished-the signal, the stop-transfer sequence, and the re-integration sequence-which in linear succession can account for all kinds of membrane protein topologies. The transmembrane orientation of the initial signal and to a weaker extent also of downstream transmembrane segments is affected by charged flanking residues according to the so-called positive-inside rule. The main driving force for transmembrane integration is hydrophobicity. Systematic analysis suggested thermodynamic equilibration of each peptide segment in the translocon with the membrane as the underlying mechanism. However, there is evidence that integration is not entirely sequence-autonomous, but depends also on the sequence context, from very closely spaced transmembrane segments to the folding state and properties of neighboring sequences. Topogenesis is even influenced by accessory proteins that appear to act as intramembrane chaperones.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Growth & Development > Biochemistry (Spiess)
UniBasel Contributors:Spiess, Martin
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:1572-3887
e-ISSN:1875-8355
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
edoc DOI:
Last Modified:01 Feb 2021 11:03
Deposited On:18 Aug 2020 11:40

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