7kar

==Cryo-EM structure of the Sec complex from S. cerevisiae, Sec63 FN3 mutant, class without Sec62==

<StructureSection load='7kar' size='340' side='right'caption='[[7kar]], [[Resolution|resolution]] 4.00&Aring;' scene=''>

<table><tr><td colspan='2'>[[7kar]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_BY4741 Saccharomyces cerevisiae BY4741]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7KAR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7KAR FirstGlance]. <br>

</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4&#8491;</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7kar FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7kar OCA], [https://pdbe.org/7kar PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7kar RCSB], [https://www.ebi.ac.uk/pdbsum/7kar PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7kar ProSAT]</span></td></tr>

== Function ==

[https://www.uniprot.org/uniprot/SC61A_YEAST SC61A_YEAST] Part of the Sec61 complex, which is the major component of a channel-forming translocon complex that mediates protein translocation across the endoplasmic reticulum (ER). The functional states of the translocon complex include co- and post-translational ER import, cotranslational membrane protein integration and retrograde transport of misfolded proteins out of the ER. In the cotranslational pathway, ribosomes synthesizing presecretory proteins are targeted to the translocon by the cytosolic signal recognition particle (SRP) and its ER-localized receptor. The association of the Sec61 complex with the ribosome is mediated by the 28S rRNA of the large ribosomal subunit. SRP-independent post-translational translocation requires the association of additional factors, such as the Sec62/63 complex and KAR2. In an initial step, the signal sequence seems to bind simultaneously to SEC61 and SEC62. A cycle of assembly and disassembly of Sec62/63 complex from SEC61 may govern the activity of the translocon. SEC61 mediates the association with the ribosome.

[[Category: Saccharomyces cerevisiae BY4741]]

[[Category: Park E]]