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Molecular mechanism of signal sequence orientation in the endoplasmic reticulum

Goder, V. and Spiess, M.. (2003) Molecular mechanism of signal sequence orientation in the endoplasmic reticulum. The EMBO journal, Vol. 22, H. 14. pp. 3645-3653.

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Official URL: http://edoc.unibas.ch/dok/A5258048

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Abstract

We have analyzed in vivo how model signal sequences are inserted and oriented in the membrane during cotranslational integration into the endoplasmic reticulum. The results are incompatible with the current models of retention of positive flanking charges or loop insertion of the polypeptide into the translocon. Instead they indicate that these N-terminal signals initially insert head-on with a cytoplasmic C-terminus before they invert their orientation to translocate the C-terminus. The rate of inversion increases with more positive N-terminal charge and is reduced with increasing hydrophobicity of the signal. Inversion may proceed for up to approximately 50 s, when it is terminated by a signal-independent process. These findings provide a mechanism for the topogenic effects of flanking charges as well as of signal hydrophobicity.
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
Bibsysno:Link to catalogue
Publisher:Nature Publishing Group
ISSN:0261-4189
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:19

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