In vivo kinetics of protein targeting to the endoplasmic reticulum determined by site-specific phosphorylation

Goder, V. and Crottet, P. and Spiess, M.. (2000) In vivo kinetics of protein targeting to the endoplasmic reticulum determined by site-specific phosphorylation. The EMBO journal, Vol. 19, H. 24. pp. 6704-6712.

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Official URL: http://edoc.unibas.ch/dok/A5258056

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We have developed a novel assay to detect the cytosolic localization of protein domains by inserting a short consensus sequence for phosphorylation by protein kinase A. In transfected COS-1 cells, this sequence was labeled efficiently with [(32)P]phosphate only when exposed to the cytosol and not when translocated into the lumen of the endoplasmic reticulum. The phosphorylation state of this sequence can therefore be used to determine the topology of membrane proteins. This assay is sufficiently sensitive to detect even the transient cytosolic exposure of the N-terminal domain of a membrane protein with a reverse signal-anchor sequence. The extent of phosphorylation per newly synthesized polypeptide was shown to reflect the time of exposure to the cytosol, which depends on translation, targeting and translocation of the N-terminus. By altering the length of the N-terminal domain or manipulating the translation rate, it was determined that protein targeting is rapid and requires only a few seconds. The rate of N-terminal translocation was estimated to be approximately 1.6 times the rate of translation.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Biochemistry (Spiess)
UniBasel Contributors:Spiess, Martin
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
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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