5nv3: Difference between revisions
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==Structure of Rubisco from Rhodobacter sphaeroides in complex with CABP== | |||
<StructureSection load='5nv3' size='340' side='right' caption='[[5nv3]], [[Resolution|resolution]] 3.39Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5nv3]] is a 16 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NV3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5NV3 FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CAP:2-CARBOXYARABINITOL-1,5-DIPHOSPHATE'>CAP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | |||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Ribulose-bisphosphate_carboxylase Ribulose-bisphosphate carboxylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.39 4.1.1.39] </span></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=5nv3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nv3 OCA], [http://pdbe.org/5nv3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5nv3 RCSB], [http://www.ebi.ac.uk/pdbsum/5nv3 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5nv3 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/RBL1_RHOSH RBL1_RHOSH]] RuBisCO catalyzes two reactions: the carboxylation of D-ribulose 1,5-bisphosphate, the primary event in carbon dioxide fixation, as well as the oxidative fragmentation of the pentose substrate. Both reactions occur simultaneously and in competition at the same active site.[HAMAP-Rule:MF_01338]<ref>PMID:9882445</ref> [[http://www.uniprot.org/uniprot/RBS1_RHOSH RBS1_RHOSH]] RuBisCO catalyzes two reactions: the carboxylation of D-ribulose 1,5-bisphosphate, the primary event in carbon dioxide fixation, as well as the oxidative fragmentation of the pentose substrate. Both reactions occur simultaneously and in competition at the same active site.<ref>PMID:9882445</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
How AAA+ chaperones conformationally remodel specific target proteins in an ATP-dependent manner is not well understood. Here, we investigated the mechanism of the AAA+ protein Rubisco activase (Rca) in metabolic repair of the photosynthetic enzyme Rubisco, a complex of eight large (RbcL) and eight small (RbcS) subunits containing eight catalytic sites. Rubisco is prone to inhibition by tight-binding sugar phosphates, whose removal is catalyzed by Rca. We engineered a stable Rca hexamer ring and analyzed its functional interaction with Rubisco. Hydrogen/deuterium exchange and chemical crosslinking showed that Rca structurally destabilizes elements of the Rubisco active site with remarkable selectivity. Cryo-electron microscopy revealed that Rca docks onto Rubisco over one active site at a time, positioning the C-terminal strand of RbcL, which stabilizes the catalytic center, for access to the Rca hexamer pore. The pulling force of Rca is fine-tuned to avoid global destabilization and allow for precise enzyme repair. | |||
Mechanism of Enzyme Repair by the AAA+ Chaperone Rubisco Activase.,Bhat JY, Milicic G, Thieulin-Pardo G, Bracher A, Maxwell A, Ciniawsky S, Mueller-Cajar O, Engen JR, Hartl FU, Wendler P, Hayer-Hartl M Mol Cell. 2017 Jul 20. pii: S1097-2765(17)30498-7. doi:, 10.1016/j.molcel.2017.07.004. PMID:28803776<ref>PMID:28803776</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5nv3" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Ribulose-bisphosphate carboxylase]] | |||
[[Category: Bracher, A]] | |||
[[Category: Ciniawsky, S]] | |||
[[Category: Hartl, F U]] | |||
[[Category: Hayer-Hartl, M]] | |||
[[Category: Milicic, G]] | |||
[[Category: Wendler, P]] | |||
[[Category: Beta barrel]] | |||
[[Category: Lyase]] | |||
