5y9n: Difference between revisions
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==Crystal structure of Pyrococcus furiosus PbaA (monoclinic form), an archaeal homolog of proteasome-assembly chaperone== | |||
<StructureSection load='5y9n' size='340' side='right' caption='[[5y9n]], [[Resolution|resolution]] 2.55Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5y9n]] is a 10 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5Y9N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5Y9N FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3wz2|3wz2]]</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5y9n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5y9n OCA], [http://pdbe.org/5y9n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5y9n RCSB], [http://www.ebi.ac.uk/pdbsum/5y9n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5y9n ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Recent bioinformatic analyses identified proteasome assembly chaperone-like proteins, PbaA and PbaB, in archaea. PbaB forms a homotetramer and functions as a proteasome activator, whereas PbaA does not interact with the proteasome despite the presence of an apparent C-terminal proteasome activation motif. We revealed that PbaA forms a homopentamer predominantly in the closed conformation with its C-terminal segments packed against the core domains, in contrast to the PbaB homotetramer with projecting C-terminal segments. This prompted us to create a novel proteasome activator based on a well-characterized structural framework. We constructed a panel of chimeric proteins comprising the homopentameric scaffold of PbaA and C-terminal segment of PbaB and subjected them to proteasome-activating assays as well as small-angle X-ray scattering and high-speed atomic force microscopy. The results indicated that the open conformation and consequent proteasome activation activity could be enhanced by replacement of the crystallographically disordered C-terminal segment of PbaA with the corresponding disordered segment of PbaB. Moreover, these effects can be produced just by incorporating two glutamate residues into the disordered C-terminal segment of PbaA, probably due to electrostatic repulsion among the negatively charged segments. Thus, we successfully endowed a functionally undefined protein with proteasome-activating activity by modifying its C-terminal segment. | |||
Conversion of functionally undefined homopentameric protein PbaA into a proteasome activator by mutational modification of its C-terminal segment conformation.,Yagi-Utsumi M, Sikdar A, Kozai T, Inoue R, Sugiyama M, Uchihashi T, Yagi H, Satoh T, Kato K Protein Eng Des Sel. 2017 Dec 28. pii: 4781309. doi: 10.1093/protein/gzx066. PMID:29301037<ref>PMID:29301037</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5y9n" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Inoue, R]] | |||
[[Category: Kato, K]] | |||
[[Category: Kozai, T]] | |||
[[Category: Satoh, T]] | |||
[[Category: Sikdar, A]] | |||
[[Category: Sugiyama, M]] | |||
[[Category: Uchihashi, T]] | |||
[[Category: Yagi-Utsumi, M]] | |||
[[Category: Chaperone]] | |||
[[Category: Proteasome]] | |||
[[Category: Proteasome activator]] | |||
[[Category: Proteasome assembly chaperone]] | |||
Revision as of 09:58, 17 January 2018
Crystal structure of Pyrococcus furiosus PbaA (monoclinic form), an archaeal homolog of proteasome-assembly chaperoneCrystal structure of Pyrococcus furiosus PbaA (monoclinic form), an archaeal homolog of proteasome-assembly chaperone
Structural highlights
Publication Abstract from PubMedRecent bioinformatic analyses identified proteasome assembly chaperone-like proteins, PbaA and PbaB, in archaea. PbaB forms a homotetramer and functions as a proteasome activator, whereas PbaA does not interact with the proteasome despite the presence of an apparent C-terminal proteasome activation motif. We revealed that PbaA forms a homopentamer predominantly in the closed conformation with its C-terminal segments packed against the core domains, in contrast to the PbaB homotetramer with projecting C-terminal segments. This prompted us to create a novel proteasome activator based on a well-characterized structural framework. We constructed a panel of chimeric proteins comprising the homopentameric scaffold of PbaA and C-terminal segment of PbaB and subjected them to proteasome-activating assays as well as small-angle X-ray scattering and high-speed atomic force microscopy. The results indicated that the open conformation and consequent proteasome activation activity could be enhanced by replacement of the crystallographically disordered C-terminal segment of PbaA with the corresponding disordered segment of PbaB. Moreover, these effects can be produced just by incorporating two glutamate residues into the disordered C-terminal segment of PbaA, probably due to electrostatic repulsion among the negatively charged segments. Thus, we successfully endowed a functionally undefined protein with proteasome-activating activity by modifying its C-terminal segment. Conversion of functionally undefined homopentameric protein PbaA into a proteasome activator by mutational modification of its C-terminal segment conformation.,Yagi-Utsumi M, Sikdar A, Kozai T, Inoue R, Sugiyama M, Uchihashi T, Yagi H, Satoh T, Kato K Protein Eng Des Sel. 2017 Dec 28. pii: 4781309. doi: 10.1093/protein/gzx066. PMID:29301037[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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