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6ed3

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Current revision (14:40, 13 March 2024) (edit) (undo)
 
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<SX load='6ed3' size='340' side='right' viewer='molstar' caption='[[6ed3]], [[Resolution|resolution]] 6.30&Aring;' scene=''>
<SX load='6ed3' size='340' side='right' viewer='molstar' caption='[[6ed3]], [[Resolution|resolution]] 6.30&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[6ed3]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ED3 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6ED3 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[6ed3]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ED3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ED3 FirstGlance]. <br>
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</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">clpB, MT0397 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1773 "Bacillus tuberculosis" (Zopf 1883) Klein 1884])</td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 6.3&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6ed3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ed3 OCA], [http://pdbe.org/6ed3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ed3 RCSB], [http://www.ebi.ac.uk/pdbsum/6ed3 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ed3 ProSAT]</span></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=6ed3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ed3 OCA], [https://pdbe.org/6ed3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ed3 RCSB], [https://www.ebi.ac.uk/pdbsum/6ed3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ed3 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/CLPB_MYCTO CLPB_MYCTO]] Part of a stress-induced multi-chaperone system, it is involved in the recovery of the cell from heat-induced damage, in cooperation with DnaK, DnaJ and GrpE. Acts before DnaK, in the processing of protein aggregates. Protein binding stimulates the ATPase activity; ATP hydrolysis unfolds the denatured protein aggregates, which probably helps expose new hydrophobic binding sites on the surface of ClpB-bound aggregates, contributing to the solubilization and refolding of denatured protein aggregates by DnaK (By similarity).
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[https://www.uniprot.org/uniprot/CLPB_MYCTU CLPB_MYCTU] Part of a stress-induced multi-chaperone system, it is involved in the recovery of the cell from heat-induced damage, in cooperation with DnaK, DnaJ and GrpE. Acts before DnaK, in the processing of protein aggregates. Protein binding stimulates the ATPase activity; ATP hydrolysis unfolds the denatured protein aggregates, which probably helps expose new hydrophobic binding sites on the surface of ClpB-bound aggregates, contributing to the solubilization and refolding of denatured protein aggregates by DnaK (By similarity).
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The protein disaggregase ClpB hexamer is conserved across evolution and has two AAA+-type nucleotide-binding domains, NBD1 and NBD2, in each protomer. In M. tuberculosis (Mtb), ClpB facilitates asymmetric distribution of protein aggregates during cell division to help the pathogen survive and persist within the host, but a mechanistic understanding has been lacking. Here we report cryo-EM structures at 3.8- to 3.9-A resolution of Mtb ClpB bound to a model substrate, casein, in the presence of the weakly hydrolyzable ATP mimic adenosine 5'-[gamma-thio]triphosphate. Mtb ClpB existed in solution in two closed-ring conformations, conformers 1 and 2. In both conformers, the 12 pore-loops on the 12 NTDs of the six protomers (P1-P6) were arranged similarly to a staircase around the bound peptide. Conformer 1 is a low-affinity state in which three of the 12 pore-loops (the protomer P1 NBD1 and NBD2 loops and the protomer P2 NBD1 loop) are not engaged with peptide. Conformer 2 is a high-affinity state because only one pore-loop (the protomer P2 NBD1 loop) is not engaged with the peptide. The resolution of the two conformations, along with their bound substrate peptides and nucleotides, enabled us to propose a nucleotide-driven peptide translocation mechanism of a bacterial ClpB that is largely consistent with several recent unfoldase structures, in particular with the eukaryotic Hsp104. However, whereas Hsp104's two NBDs move in opposing directions during one step of peptide translocation, in Mtb ClpB the two NBDs move only in the direction of translocation.
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ATP hydrolysis-coupled peptide translocation mechanism of Mycobacterium tuberculosis ClpB.,Yu H, Lupoli TJ, Kovach A, Meng X, Zhao G, Nathan CF, Li H Proc Natl Acad Sci U S A. 2018 Sep 26. pii: 1810648115. doi:, 10.1073/pnas.1810648115. PMID:30257943<ref>PMID:30257943</ref>
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==See Also==
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*[[Heat Shock Protein structures|Heat Shock Protein structures]]
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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*[[3D structures of ClpB|3D structures of ClpB]]
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</div>
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<div class="pdbe-citations 6ed3" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</SX>
</SX>
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Li, H L]]
 
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[[Category: Yu, H J]]
 
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[[Category: Aaa atpase]]
 
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[[Category: Chaperone]]
 
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[[Category: Cryoem]]
 
[[Category: Mycobacterium tuberculosis]]
[[Category: Mycobacterium tuberculosis]]
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[[Category: Pathogen]]
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[[Category: Li HL]]
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[[Category: Unfoldase]]
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[[Category: Yu HJ]]

Current revision

Mtb ClpB in complex with AMPPNP

6ed3, resolution 6.30Å

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