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- Title
Molecular mechanism of signal sequence orientation in the endoplasmic reticulum.
- Authors
Goder, Veit; Spiess, Martin
- 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.
- Publication
The EMBO journal, 2003, Vol 22, Issue 14, p3645
- ISSN
0261-4189
- Publication type
Journal Article
- DOI
10.1093/emboj/cdg361