PMID- 22505607 OWN - NLM STAT- MEDLINE DCOM- 20130507 LR - 20211021 IS - 1477-9137 (Electronic) IS - 0021-9533 (Print) IS - 0021-9533 (Linking) VI - 125 IP - Pt 15 DP - 2012 Aug 1 TI - TRC40 can deliver short secretory proteins to the Sec61 translocon. PG - 3612-20 AB - Whilst the co-translational translocation of nascent proteins across the mammalian endoplasmic reticulum (ER) is well defined, the capacity of this organelle for post-translational translocation is poorly delineated. Here we identify two human secretory protein precursors, apelin and statherin, as bona fide substrates for post-translational translocation across the ER membrane. Further studies, in combination with Hyalophora cecropia preprocecropin A (ppcecA), show that all three proteins bind to TRC40 and can utilise this component for their delivery to the ER membrane in a well-established in vitro system. However, ppcecA is not an obligate TRC40 substrate, and it can also be delivered to the ER by an alternative TRC40-independent pathway. Upon arrival at the ER membrane, these short secretory proteins appear to be ubiquitously transported across the ER membrane through the Sec61 translocon, apparently irrespective of their delivery route. We speculate that the post-translational translocation of secretory proteins in higher eukaryotes is more prevalent than previously acknowledged. FAU - Johnson, Nicholas AU - Johnson N AD - Faculty of Life Sciences, The University of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK. FAU - Vilardi, Fabio AU - Vilardi F FAU - Lang, Sven AU - Lang S FAU - Leznicki, Pawel AU - Leznicki P FAU - Zimmermann, Richard AU - Zimmermann R FAU - High, Stephen AU - High S LA - eng GR - BB/D005752/1/BB_/Biotechnology and Biological Sciences Research Council/United Kingdom GR - WT092107/WT_/Wellcome Trust/United Kingdom PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120414 PL - England TA - J Cell Sci JT - Journal of cell science JID - 0052457 RN - 0 (1-(4-chlorophenyl)-3-(3-(4-chlorophenyl)-5,5-dimethyl-1-(3-(5-nitrofuran-2-yl)allyldienehydrazinocarbonylmethyl)-2-oxoimidazolidin-4-yl)-1-hydroxyurea) RN - 0 (APLN protein, human) RN - 0 (Apelin) RN - 0 (GET1 protein, human) RN - 0 (GET3 protein, human) RN - 0 (HSC70 Heat-Shock Proteins) RN - 0 (HSPA8 protein, human) RN - 0 (Hydrazones) RN - 0 (Intercellular Signaling Peptides and Proteins) RN - 0 (Membrane Proteins) RN - 0 (Membrane Transport Proteins) RN - 0 (Nuclear Proteins) RN - 0 (SEC Translocation Channels) RN - 0 (STATH protein, human) RN - 0 (Salivary Proteins and Peptides) RN - EC 3.6.3.16 (Arsenite Transporting ATPases) RN - X6Q56QN5QC (Hydroxyurea) SB - IM EIN - J Cell Sci. 2012 Sep 15;125(Pt 18):4414 MH - Amino Acid Sequence MH - Animals MH - Apelin MH - Arsenite Transporting ATPases/genetics/*metabolism MH - Dogs MH - Endoplasmic Reticulum/metabolism MH - HSC70 Heat-Shock Proteins/metabolism MH - Humans MH - Hydrazones/pharmacology MH - Hydroxyurea/analogs & derivatives/pharmacology MH - Intercellular Signaling Peptides and Proteins/*metabolism MH - Intracellular Membranes/metabolism MH - Membrane Proteins/genetics/*metabolism MH - Membrane Transport Proteins/*metabolism MH - Molecular Sequence Data MH - Nuclear Proteins/metabolism MH - *Protein Processing, Post-Translational MH - Protein Transport MH - Rabbits MH - SEC Translocation Channels MH - Salivary Proteins and Peptides/*metabolism PMC - PMC3445324 EDAT- 2012/04/17 06:00 MHDA- 2013/05/08 06:00 PMCR- 2012/08/01 CRDT- 2012/04/17 06:00 PHST- 2012/04/17 06:00 [entrez] PHST- 2012/04/17 06:00 [pubmed] PHST- 2013/05/08 06:00 [medline] PHST- 2012/08/01 00:00 [pmc-release] AID - jcs.102608 [pii] AID - 10.1242/jcs.102608 [doi] PST - ppublish SO - J Cell Sci. 2012 Aug 1;125(Pt 15):3612-20. doi: 10.1242/jcs.102608. Epub 2012 Apr 14.