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New page: left|200px<br /> <applet load="1tui" size="450" color="white" frame="true" align="right" spinBox="true" caption="1tui, resolution 2.7Å" /> '''INTACT ELONGATION FA...
 
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[[Image:1tui.gif|left|200px]]<br />
<applet load="1tui" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1tui, resolution 2.7&Aring;" />
'''INTACT ELONGATION FACTOR TU IN COMPLEX WITH GDP'''<br />


==Overview==
==INTACT ELONGATION FACTOR TU IN COMPLEX WITH GDP==
BACKGROUND: Elongation factor Tu (EF-Tu) in its GTP conformation is a, carrier of aminoacylated tRNAs (aa-tRNAs) to the ribosomal A site during, protein biosynthesis. The ribosome triggers GTP hydrolysis, resulting in, the dissociation of EF-Tu-GDP from the ribosome. The affinity of EF-Tu for, other molecules involved in this process, some of which are unknown, is, regulated by two regions (Switch I and Switch II) that have different, conformations in the GTP and GDP forms. The structure of the GDP form of, EF-Tu is known only as a trypsin-modified fragment, which lacks the Switch, I, or effector, domain. The aim of this work was to establish the overall, structure of intact EF-Tu-GDP, in particular the structure of the effector, domain. RESULTS: The crystal structures of intact EF-Tu-GDP from Thermus, aquaticus and Escherichia coli have been determined at resolutions of 2.7, A and 3.8 A, respectively. The structures confirm the domain orientation, previously found in the structure of partially trypsin-digested EF-Tu-GDP., The structures of the effector region in T. aquaticus and E. coli, EF-Tu-GDP are very similar. The C-terminal part of the effector region of, EF-Tu-GDP is a beta hairpin; in EF-Tu-GTP, this region forms an alpha, helix. This conformational change is not a consequence of crystal packing., CONCLUSIONS: EF-Tu undergoes major conformational changes upon GTP, hydrolysis. Unlike other GTP-binding proteins, EF-Tu exhibits a dramatic, conformational change in the effector region, involving an unwinding of a, small helix and the formation of a beta hairpin structure. This change is, presumably involved in triggering the release of tRNA, and EF-Tu, from the, ribosome.
<StructureSection load='1tui' size='340' side='right'caption='[[1tui]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1tui]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus]. The September 2006 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Elongation Factors''  by David S. Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2006_9 10.2210/rcsb_pdb/mom_2006_9]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TUI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1TUI FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=1tui FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tui OCA], [https://pdbe.org/1tui PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1tui RCSB], [https://www.ebi.ac.uk/pdbsum/1tui PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1tui ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/EFTU_THEAQ EFTU_THEAQ] This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis.[HAMAP-Rule:MF_00118_B]
== 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/tu/1tui_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=1tui ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1TUI is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus] with MG and GDP as [http://en.wikipedia.org/wiki/ligands ligands]. The following page contains interesting information on the relation of 1TUI with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb81_1.html Elongation Factors]]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1TUI OCA].
*[[Elongation factor 3D structures|Elongation factor 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Helix unwinding in the effector region of elongation factor EF-Tu-GDP., Polekhina G, Thirup S, Kjeldgaard M, Nissen P, Lippmann C, Nyborg J, Structure. 1996 Oct 15;4(10):1141-51. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8939739 8939739]
[[Category: Elongation Factors]]
[[Category: Elongation Factors]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: RCSB PDB Molecule of the Month]]
[[Category: Thermus aquaticus]]
[[Category: Thermus aquaticus]]
[[Category: Kjeldgaard, M.]]
[[Category: Kjeldgaard M]]
[[Category: Lippmann, C.]]
[[Category: Lippmann C]]
[[Category: Nissen, P.]]
[[Category: Nissen P]]
[[Category: Nyborg, J.]]
[[Category: Nyborg J]]
[[Category: Polekhina, G.]]
[[Category: Polekhina G]]
[[Category: Thirup, S.]]
[[Category: Thirup S]]
[[Category: GDP]]
[[Category: MG]]
[[Category: elongation factor]]
[[Category: gtp-binding]]
[[Category: protein biosynthesis]]
 
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Sun Nov 18 09:06:43 2007''

Latest revision as of 08:42, 14 February 2024

INTACT ELONGATION FACTOR TU IN COMPLEX WITH GDP

1tui, resolution 2.70Å

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