View source for 5lmq


==Structure of bacterial 30S-IF1-IF3-mRNA-tRNA translation pre-initiation complex, open form (state-2A)==
<SX load='5lmq' size='340' side='right' viewer='molstar' caption='[[5lmq]], [[Resolution|resolution]] 4.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5lmq]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5LMQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5LMQ 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]] 4.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4SU:4-THIOURIDINE-5-MONOPHOSPHATE'>4SU</scene>, <scene name='pdbligand=5MU:5-METHYLURIDINE+5-MONOPHOSPHATE'>5MU</scene>, <scene name='pdbligand=G7M:N7-METHYL-GUANOSINE-5-MONOPHOSPHATE'>G7M</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OMC:O2-METHYLYCYTIDINE-5-MONOPHOSPHATE'>OMC</scene>, <scene name='pdbligand=PSU:PSEUDOURIDINE-5-MONOPHOSPHATE'>PSU</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'>[https://proteopedia.org/fgij/fg.htm?mol=5lmq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5lmq OCA], [https://pdbe.org/5lmq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5lmq RCSB], [https://www.ebi.ac.uk/pdbsum/5lmq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5lmq ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/RS2_THET8 RS2_THET8] Spans the head-body hinge region of the 30S subunit. Is loosely associated with the 30S subunit.[HAMAP-Rule:MF_00291_B]
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== Publication Abstract from PubMed ==
In bacterial translational initiation, three initiation factors (IFs 1-3) enable the selection of initiator tRNA and the start codon in the P site of the 30S ribosomal subunit. Here, we report 11 single-particle cryo-electron microscopy (cryoEM) reconstructions of the complex of bacterial 30S subunit with initiator tRNA, mRNA, and IFs 1-3, representing different steps along the initiation pathway. IF1 provides key anchoring points for IF2 and IF3, thereby enhancing their activities. IF2 positions a domain in an extended conformation appropriate for capturing the formylmethionyl moiety charged on tRNA. IF3 and tRNA undergo large conformational changes to facilitate the accommodation of the formylmethionyl-tRNA (fMet-tRNA(fMet)) into the P site for start codon recognition.

Large-Scale Movements of IF3 and tRNA during Bacterial Translation Initiation.,Hussain T, Llacer JL, Wimberly BT, Kieft JS, Ramakrishnan V Cell. 2016 Sep 22;167(1):133-144.e13. doi: 10.1016/j.cell.2016.08.074. PMID:27662086<ref>PMID:27662086</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 5lmq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosomal protein THX 3D structures|Ribosomal protein THX 3D structures]]
== References ==
<references/>
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[[Category: Large Structures]]
[[Category: Thermus thermophilus HB8]]
[[Category: Hussain T]]
[[Category: Llacer JL]]
[[Category: Ramakrishnan V]]
[[Category: Wimberly BT]]