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{{Large structure}}
 
==Structure of a prehandover mammalian ribosomal SRP and SRP receptor targeting complex==
==Structure of a prehandover mammalian ribosomal SRP and SRP receptor targeting complex==
<StructureSection load='6frk' size='340' side='right' caption='[[6frk]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
<SX load='6frk' size='340' side='right' viewer='molstar' caption='[[6frk]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[6frk]] is a 58 chain structure with sequence from [http://en.wikipedia.org/wiki/ ], [http://en.wikipedia.org/wiki/Canis_lupus_familiaris Canis lupus familiaris] and [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6FRK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6FRK FirstGlance]. <br>
<table><tr><td colspan='2'>[[6frk]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Canis_lupus_familiaris Canis lupus familiaris] and [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6FRK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6FRK FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GNP:PHOSPHOAMINOPHOSPHONIC+ACID-GUANYLATE+ESTER'>GNP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.7&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GNP:PHOSPHOAMINOPHOSPHONIC+ACID-GUANYLATE+ESTER'>GNP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6frk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6frk OCA], [http://pdbe.org/6frk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6frk RCSB], [http://www.ebi.ac.uk/pdbsum/6frk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6frk ProSAT]</span></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=6frk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6frk OCA], [https://pdbe.org/6frk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6frk RCSB], [https://www.ebi.ac.uk/pdbsum/6frk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6frk ProSAT]</span></td></tr>
</table>
</table>
{{Large structure}}
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/SRP14_CANLF SRP14_CANLF]] Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP. The complex of SRP9 and SRP14 is required for SRP RNA binding. [[http://www.uniprot.org/uniprot/SRP54_CANLF SRP54_CANLF]] Binds to the signal sequence of presecretory protein when they emerge from the ribosomes and transfers them to TRAM (translocating chain-associating membrane protein).
[https://www.uniprot.org/uniprot/SRP09_CANLF SRP09_CANLF]  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Signal recognition particle (SRP) targets proteins to the endoplasmic reticulum (ER). SRP recognizes the ribosome synthesizing a signal sequence and delivers it to the SRP receptor (SR) on the ER membrane followed by the transfer of the signal sequence to the translocon. Here, we present the cryo-EM structure of the mammalian translating ribosome in complex with SRP and SR in a conformation preceding signal sequence handover. The structure visualizes all eukaryotic-specific SRP and SR proteins and reveals their roles in stabilizing this conformation by forming a large protein assembly at the distal site of SRP RNA. We provide biochemical evidence that the GTP hydrolysis of SRP*SR is delayed at this stage, possibly to provide a time window for signal sequence handover to the translocon.
 
Structure of a prehandover mammalian ribosomal SRP*SRP receptor targeting complex.,Kobayashi K, Jomaa A, Lee JH, Chandrasekar S, Boehringer D, Shan SO, Ban N Science. 2018 Mar 22. pii: science.aar7924. doi: 10.1126/science.aar7924. PMID:29567807<ref>PMID:29567807</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6frk" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</SX>
[[Category: Canis lupus familiaris]]
[[Category: Canis lupus familiaris]]
[[Category: Large Structures]]
[[Category: Oryctolagus cuniculus]]
[[Category: Oryctolagus cuniculus]]
[[Category: Ban, N]]
[[Category: Ban N]]
[[Category: Jomaa, A]]
[[Category: Jomaa A]]
[[Category: Kobayashi, K]]
[[Category: Kobayashi K]]
[[Category: Er membrane targeting ribosome signal recognition particle]]
[[Category: Translation]]
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