1ha3: Difference between revisions

Revision as of 18:37, 2 May 2008

ELONGATION FACTOR TU IN COMPLEX WITH AURODOX

OverviewOverview

Aurodox is a member of the family of kirromycin antibiotics, which inhibit protein biosynthesis by binding to elongation factor Tu (EF-Tu). We have determined the crystal structure of the 1:1:1 complex of Thermus thermophilus EF-Tu with GDP and aurodox to 2.0-A resolution. During its catalytic cycle, EF-Tu adopts two strikingly different conformations depending on the nucleotide bound: the GDP form and the GTP form. In the present structure, a GTP complex-like conformation of EF-Tu is observed, although GDP is bound to the nucleotide-binding site. This is consistent with previous proposals that aurodox fixes EF-Tu on the ribosome by locking it in its GTP form. Binding of EF-Tu.GDP to aminoacyl-tRNA and mutually exclusive binding of kirromycin and elongation factor Ts to EF-Tu can be explained on the basis of the structure. For many previously observed mutations that provide resistance to kirromycin, it can now be understood how they prevent interaction with the antibiotic. An unexpected feature of the structure is the reorientation of the His-85 side chain toward the nucleotide-binding site. We propose that this residue stabilizes the transition state of GTP hydrolysis, explaining the acceleration of the reaction by kirromycin-type antibiotics.

About this StructureAbout this Structure

1HA3 is a Single protein structure of sequence from Thermus aquaticus. Full crystallographic information is available from OCA.

ReferenceReference

Conformational change of elongation factor Tu (EF-Tu) induced by antibiotic binding. Crystal structure of the complex between EF-Tu.GDP and aurodox., Vogeley L, Palm GJ, Mesters JR, Hilgenfeld R, J Biol Chem. 2001 May 18;276(20):17149-55. Epub 2001 Jan 30. PMID:11278992 Page seeded by OCA on Fri May 2 18:37:26 2008

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OCA

@@ Line 1: / Line 1: @@
 [[Image:1ha3.gif|left|200px]]
- {{Structure
+<!--
-|PDB= 1ha3 |SIZE=350|CAPTION= <scene name='initialview01'>1ha3</scene>, resolution 2.00&Aring;
+The line below this paragraph, containing "STRUCTURE_1ha3", creates the "Structure Box" on the page.
-|SITE= <scene name='pdbsite=GDA:Gdp+Binding+Site+For+Chain+A'>GDA</scene>, <scene name='pdbsite=GDB:Gdp+Binding+Site+For+Chain+B'>GDB</scene>, <scene name='pdbsite=MAA:Mau+Binding+Site+For+Chain+A+Symmetry+Related+Subunits+C+...'>MAA</scene>, <scene name='pdbsite=MAB:Mau+Binding+Site+For+Chain+B+Symmetry+Related+Subunits+C+...'>MAB</scene>, <scene name='pdbsite=MGA:Mg+Binding+Site+For+Chain+A'>MGA</scene> and <scene name='pdbsite=MGB:Mg+Binding+Site+For+Chain+B'>MGB</scene>
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND= <scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene>, <scene name='pdbligand=GDP:GUANOSINE-5&#39;-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MAU:N-METHYL+KIRROMYCIN'>MAU</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/dGTPase dGTPase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.5.1 3.1.5.1] </span>
+or leave the SCENE parameter empty for the default display.
-|GENE= TUFB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=271 Thermus aquaticus])
+-->
-|DOMAIN=
+{{STRUCTURE_1ha3|  PDB=1ha3  |  SCENE=  }}
-|RELATEDENTRY=
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ha3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ha3 OCA], [http://www.ebi.ac.uk/pdbsum/1ha3 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ha3 RCSB]</span>
-}}
 '''ELONGATION FACTOR TU IN COMPLEX WITH AURODOX'''
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 [[Category: Single protein]]
 [[Category: Thermus aquaticus]]
-[[Category: dGTPase]]
+[[Category: DGTPase]]
 [[Category: Hilgenfeld, R.]]
 [[Category: Mesters, J R.]]
 [[Category: Palm, G.]]
 [[Category: Vogeley, L.]]
-[[Category: antibiotic]]
+[[Category: Antibiotic]]
-[[Category: aurodox]]
+[[Category: Aurodox]]
-[[Category: gtpase]]
+[[Category: Gtpase]]
-[[Category: n-methyl-kirromycin]]
+[[Category: N-methyl-kirromycin]]
-[[Category: ribosome]]
+[[Category: Ribosome]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 18:37:26 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:00:59 2008''