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[[Image:1mfq.gif|left|200px]]


{{Structure
==Crystal Structure Analysis of a Ternary S-Domain Complex of Human Signal Recognition Particle==
|PDB= 1mfq |SIZE=350|CAPTION= <scene name='initialview01'>1mfq</scene>, resolution 3.10&Aring;
<StructureSection load='1mfq' size='340' side='right'caption='[[1mfq]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=A:ADENOSINE-5&#39;-MONOPHOSPHATE'>A</scene>, <scene name='pdbligand=C:CYTIDINE-5&#39;-MONOPHOSPHATE'>C</scene>, <scene name='pdbligand=CCC:CYTIDINE-5&#39;-PHOSPHATE-2&#39;,3&#39;-CYCLIC+PHOSPHATE'>CCC</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=G:GUANOSINE-5&#39;-MONOPHOSPHATE'>G</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=U:URIDINE-5&#39;-MONOPHOSPHATE'>U</scene>
<table><tr><td colspan='2'>[[1mfq]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MFQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MFQ FirstGlance]. <br>
|ACTIVITY=  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.1&#8491;</td></tr>
|GENE= SRP19 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), SRP54 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CCC:CYTIDINE-5-PHOSPHATE-2,3-CYCLIC+PHOSPHATE'>CCC</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1mfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mfq OCA], [https://pdbe.org/1mfq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mfq RCSB], [https://www.ebi.ac.uk/pdbsum/1mfq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mfq ProSAT]</span></td></tr>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1mfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mfq OCA], [http://www.ebi.ac.uk/pdbsum/1mfq PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1mfq RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/SRP19_HUMAN SRP19_HUMAN] Signal-recognition-particle assembly, binds directly to 7S RNA and mediates binding of the 54 kDa subunit of the SRP.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mf/1mfq_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mfq ConSurf].
<div style="clear:both"></div>


'''Crystal Structure Analysis of a Ternary S-Domain Complex of Human Signal Recognition Particle'''
==See Also==
 
*[[Signal recognition particle 3D structures|Signal recognition particle 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
The eukaryotic signal recognition particle (SRP) is a cytoplasmic ribonucleoprotein particle that targets secretory and membrane proteins to the endoplasmic reticulum. The binding of SRP54 to the S domain of 7SL RNA is highly dependent on SRP19. Here we present the crystal structure of a human SRP ternary complex consisting of SRP19, the M domain of SRP54 and the S domain of 7SL RNA. Upon binding of the M domain of SRP54 to the 7SL RNA-SRP19 complex, the asymmetric loop of helix 8 in 7SL RNA collapses. The bases of the four nucleotides in the long strand of the asymmetric loop continuously stack and interact with the M domain, whereas the two adenines in the short strand flip out and form two A-minor motifs with helix 6. This stabilizing interaction is only possible when helix 6 has been positioned parallel to helix 8 by the prior binding of SRP19 to the tetraloops of helices 6 and 8. Hence, the crystal structure of the ternary complex suggests why SRP19 is necessary for the stable binding of SRP54 to the S domain RNA.
 
==About this Structure==
1MFQ is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MFQ OCA].
 
==Reference==
Induced structural changes of 7SL RNA during the assembly of human signal recognition particle., Kuglstatter A, Oubridge C, Nagai K, Nat Struct Biol. 2002 Oct;9(10):740-4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12244299 12244299]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Protein complex]]
[[Category: Large Structures]]
[[Category: Kuglstatter, A.]]
[[Category: Kuglstatter A]]
[[Category: Nagai, K.]]
[[Category: Nagai K]]
[[Category: Oubridge, C.]]
[[Category: Oubridge C]]
[[Category: 3-helix junction]]
[[Category: a-minor motif]]
[[Category: rna-protein complex]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:15:33 2008''

Latest revision as of 10:43, 14 February 2024

Crystal Structure Analysis of a Ternary S-Domain Complex of Human Signal Recognition ParticleCrystal Structure Analysis of a Ternary S-Domain Complex of Human Signal Recognition Particle

Structural highlights

1mfq is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3.1Å
Ligands:, ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SRP19_HUMAN Signal-recognition-particle assembly, binds directly to 7S RNA and mediates binding of the 54 kDa subunit of the SRP.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1mfq, resolution 3.10Å

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OCA
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