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Cotranslational Targeting and Posttranslational Translocation can Cooperate in Spc3 Topogenesis

Jung, Sung-Jun and Kim, Ji Eun Hani and Junne, Tina and Spiess, Martin and Kim, Hyun. (2021) Cotranslational Targeting and Posttranslational Translocation can Cooperate in Spc3 Topogenesis. Journal of Molecular Biology, 433 (18). p. 167109.

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Official URL: https://edoc.unibas.ch/84369/

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Abstract

Secretory and membrane proteins follow either the signal recognition particle (SRP)-dependent cotranslational translocation pathway or the SRP-independent Sec62/Sec63-dependent posttranslational pathway for their translocation across the endoplasmic reticulum (ER). However, increasing evidence suggests that most proteins are cotranslationally targeted to the ER, suggesting mixed mechanisms. It remains unclear how these two pathways cooperate. Previous studies have shown that Spc3, a signal-anchored protein, requires SRP and Sec62 for its biogenesis. This study investigated the targeting and topogenesis of Spc3 and the step at which SRP and Sec62 act using in vivo and in vitro translocation assays and co-immunoprecipitation. Our data suggest that Spc3 reaches its final topology in two steps: it enters the ER lumen head-first and then inverts its orientation. The first step is partially dependent on SRP, although independent of the Sec62/Sec63 complex. The second step is mediated by the Sec62/Sec63 complex. These data suggest that SRP and Sec62 act on a distinct step in the topogenesis of Spc3.
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:Elsevier
ISSN:0022-2836
e-ISSN:1089-8638
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:06 Sep 2021 08:04
Deposited On:06 Sep 2021 08:04

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