1qqn

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[[Image:1qqn.gif|left|200px]]<br /><applet load="1qqn" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1qqn, resolution 1.90&Aring;" />
 
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'''D206S MUTANT OF BOVINE 70 KILODALTON HEAT SHOCK PROTEIN'''<br />
 
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==Overview==
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==D206S MUTANT OF BOVINE 70 KILODALTON HEAT SHOCK PROTEIN==
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ATP binding induces a conformational change in 70-kDa heat shock proteins (Hsp70s) that facilitates release of bound polypeptides. Using the bovine heat shock cognate protein (Hsc70) as a representative of the Hsp70 family, we have characterized the effect of mutations on the coupling between ATP binding and the nucleotide-induced conformational change. Steady-state solution small-angle X-ray scattering and kinetic fluorescence measurements on a 60-kDa fragment of Hsc70 show that point mutations K71M, E175S, D199S, and D206S in the nucleotide binding cleft impair the ability of ATP to induce a conformational change. A secondary mutation in the peptide binding domain, E543K, "rescues" the ATP-induced transition for three of these mutations (E175S/E543K, D199S/E543K, and D206S/E543K) but not for K71M/E543K. Analysis of kinetics of the ATPase cycle confirm that these effects do not result from unexpectedly rapid ATP hydrolysis or slow ATP binding. Crystallographic structures of E175S, D199S, and D206S mutant ATPase fragment proteins show that the mutations do not perturb the tertiary structure of the protein but do significantly alter the protein-ligand interactions, due in part to an apparent charge compensation effect whereby mutating a (probably) negatively charged carboxyl group to a neutral serine displaces a K+ ion from the nucleotide binding cleft in two out of three cases (E175S and D199S but not D206S).
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<StructureSection load='1qqn' size='340' side='right'caption='[[1qqn]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1qqn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QQN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QQN FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qqn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qqn OCA], [https://pdbe.org/1qqn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qqn RCSB], [https://www.ebi.ac.uk/pdbsum/1qqn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qqn ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/HSP7C_BOVIN HSP7C_BOVIN] Acts as a repressor of transcriptional activation. Inhibits the transcriptional coactivator activity of CITED1 on Smad-mediated transcription. Chaperone. Component of the PRP19-CDC5L complex that forms an integral part of the spliceosome and is required for activating pre-mRNA splicing. May have a scaffolding role in the spliceosome assembly as it contacts all other components of the core complex (By similarity).
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qq/1qqn_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1qqn ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1QQN is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=K:'>K</scene>, <scene name='pdbligand=CL:'>CL</scene>, <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=PO4:'>PO4</scene> and <scene name='pdbligand=ADP:'>ADP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QQN OCA].
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*[[Heat Shock Protein structures|Heat Shock Protein structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Mapping the role of active site residues for transducing an ATP-induced conformational change in the bovine 70-kDa heat shock cognate protein., Johnson ER, McKay DB, Biochemistry. 1999 Aug 17;38(33):10823-30. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10451379 10451379]
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[[Category: Bos taurus]]
[[Category: Bos taurus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Johnson, E R.]]
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[[Category: Johnson ER]]
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[[Category: McKay, D B.]]
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[[Category: McKay DB]]
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[[Category: ADP]]
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[[Category: CL]]
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[[Category: K]]
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[[Category: MG]]
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[[Category: PO4]]
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[[Category: atpase]]
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[[Category: hydrolase (acting on acid anhydrides)]]
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[[Category: molecular chaperone]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:42:37 2008''
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Current revision

D206S MUTANT OF BOVINE 70 KILODALTON HEAT SHOCK PROTEIN

PDB ID 1qqn

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