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1g4b

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[[Image:1g4b.jpg|left|200px]]<br /><applet load="1g4b" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1g4b, resolution 7.0&Aring;" />
 
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'''CRYSTAL STRUCTURES OF THE HSLVU PEPTIDASE-ATPASE COMPLEX REVEAL AN ATP-DEPENDENT PROTEOLYSIS MECHANISM'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURES OF THE HSLVU PEPTIDASE-ATPASE COMPLEX REVEAL AN ATP-DEPENDENT PROTEOLYSIS MECHANISM==
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BACKGROUND: The bacterial heat shock locus HslU ATPase and HslV peptidase together form an ATP-dependent HslVU protease. Bacterial HslVU is a homolog of the eukaryotic 26S proteasome. Crystallographic studies of HslVU should provide an understanding of ATP-dependent protein unfolding, translocation, and proteolysis by this and other ATP-dependent proteases. RESULTS: We present a 3.0 A resolution crystal structure of HslVU with an HslU hexamer bound at one end of an HslV dodecamer. The structure shows that the central pores of the ATPase and peptidase are next to each other and aligned. The central pore of HslU consists of a GYVG motif, which is conserved among protease-associated ATPases. The binding of one HslU hexamer to one end of an HslV dodecamer in the 3.0 A resolution structure opens both HslV central pores and induces asymmetric changes in HslV. CONCLUSIONS: Analysis of nucleotide binding induced conformational changes in the current and previous HslU structures suggests a protein unfolding-coupled translocation mechanism. In this mechanism, unfolded polypeptides are threaded through the aligned pores of the ATPase and peptidase and translocated into the peptidase central chamber.
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<StructureSection load='1g4b' size='340' side='right'caption='[[1g4b]], [[Resolution|resolution]] 7.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1g4b]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G4B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G4B 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]] 7&#8491;</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=1g4b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g4b OCA], [https://pdbe.org/1g4b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g4b RCSB], [https://www.ebi.ac.uk/pdbsum/1g4b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g4b ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/HSLU_ECOLI HSLU_ECOLI] ATPase subunit of a proteasome-like degradation complex; this subunit has chaperone activity. The binding of ATP and its subsequent hydrolysis by HslU are essential for unfolding of protein substrates subsequently hydrolyzed by HslV. HslU recognizes the N-terminal part of its protein substrates and unfolds these before they are guided to HslV for hydrolysis.<ref>PMID:8662828</ref> <ref>PMID:8650174</ref> <ref>PMID:9288941</ref> <ref>PMID:9393683</ref> <ref>PMID:10452560</ref> <ref>PMID:10419524</ref> <ref>PMID:15696175</ref>
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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/g4/1g4b_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=1g4b 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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1G4B is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G4B OCA].
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*[[Heat Shock Protein structures|Heat Shock Protein structures]]
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== References ==
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==Reference==
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<references/>
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Crystal structures of the HslVU peptidase-ATPase complex reveal an ATP-dependent proteolysis mechanism., Wang J, Song JJ, Franklin MC, Kamtekar S, Im YJ, Rho SH, Seong IS, Lee CS, Chung CH, Eom SH, Structure. 2001 Feb 7;9(2):177-84. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11250202 11250202]
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__TOC__
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</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Protein complex]]
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[[Category: Large Structures]]
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[[Category: Chung, C H.]]
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[[Category: Chung CH]]
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[[Category: Eom, S H.]]
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[[Category: Eom SH]]
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[[Category: Franklin, M C.]]
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[[Category: Franklin MC]]
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[[Category: Im, Y J.]]
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[[Category: Im YJ]]
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[[Category: Kamtekar, S.]]
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[[Category: Kamtekar S]]
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[[Category: Lee, C S.]]
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[[Category: Lee CS]]
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[[Category: Rho, S H.]]
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[[Category: Rho SH]]
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[[Category: Seong, I S.]]
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[[Category: Seong IS]]
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[[Category: Song, J J.]]
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[[Category: Song JJ]]
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[[Category: Wang, J.]]
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[[Category: Wang J]]
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[[Category: hslvu]]
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[[Category: peptidase-atpase complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:45:57 2008''
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Current revision

CRYSTAL STRUCTURES OF THE HSLVU PEPTIDASE-ATPASE COMPLEX REVEAL AN ATP-DEPENDENT PROTEOLYSIS MECHANISM

PDB ID 1g4b

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