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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1ej7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Nicotiana_tabacum Nicotiana tabacum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EJ7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EJ7 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1ej7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Nicotiana_tabacum Nicotiana tabacum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EJ7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EJ7 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.45&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[8ruc|8ruc]]</div></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Ribulose-bisphosphate_carboxylase Ribulose-bisphosphate carboxylase], with EC number [https://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'>[https://proteopedia.org/fgij/fg.htm?mol=1ej7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ej7 OCA], [https://pdbe.org/1ej7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ej7 RCSB], [https://www.ebi.ac.uk/pdbsum/1ej7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ej7 ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ej7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ej7 OCA], [https://pdbe.org/1ej7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ej7 RCSB], [https://www.ebi.ac.uk/pdbsum/1ej7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ej7 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/RBL_TOBAC RBL_TOBAC]] 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 in the photorespiration process. Both reactions occur simultaneously and in competition at the same active site.[HAMAP-Rule:MF_01338] [[https://www.uniprot.org/uniprot/RBS_TOBAC RBS_TOBAC]] 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.  
[https://www.uniprot.org/uniprot/RBS_TOBAC RBS_TOBAC] 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.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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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=1ej7 ConSurf].
</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=1ej7 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
d-Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) catalyses the central CO(2)-fixing reaction of photosynthesis in a complex, multiple-step process. Several structures of rubisco complexed with substrate analogues, inhibitors and products have been determined by X-ray crystallography. The structures fall into two well-defined and distinct states. The active site is either "open" or "closed". The timing and mechanism of the transition between these two states have been uncertain. We solved the crystal structure of unactivated (metal-free) rubisco from tobacco with only inorganic phosphate bound and conclude that phosphate binding per se does not trigger closure, as it does in the similarly structured enzyme, triosephosphate isomerase. Comparison of all available rubisco structures suggests that, instead, the distance between the terminal phosphates (P1 and P2) of the bisphosphate ligand is the trigger: if that distance is less than 9.1 A, then the active site closes; if it is greater than 9.4 A then the enzyme remains open. Shortening of the inter-phosphate distance results from the ligand binding in a more curved conformation when O atoms of the ligand's sugar backbone interact either with the metal, if it is present, or with charged groups in the metal-binding site, if the metal is absent. This shortening brings the P1 phosphate into hydrogen bonding contact with Thr65. Thr65 exists in two discrete states related by a rotation of the backbone psi torsion angle. This rotation is coupled to domain rotation and hence to active site closure. Rotation of the side-chain of Thr65 also affects the C-terminal strand of large subunit which packs against Loop 6 after closure. The position of the C-terminal strand in the closed state is stabilised by multiple polar interactions with a distinctive highly-charged latch site involving the side-chain of Asp473. In the open state, this latch site may be occupied instead by phosphorylated anions.
The transition between the open and closed states of rubisco is triggered by the inter-phosphate distance of the bound bisphosphate.,Duff AP, Andrews TJ, Curmi PM J Mol Biol. 2000 May 19;298(5):903-16. PMID:10801357<ref>PMID:10801357</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ej7" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[RuBisCO 3D structures|RuBisCO 3D structures]]
*[[RuBisCO 3D structures|RuBisCO 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Nicotiana tabacum]]
[[Category: Nicotiana tabacum]]
[[Category: Ribulose-bisphosphate carboxylase]]
[[Category: Andrews TJ]]
[[Category: Andrews, T J]]
[[Category: Curmi PMG]]
[[Category: Curmi, P M.G]]
[[Category: Duff AP]]
[[Category: Duff, A P]]
[[Category: Alpha/beta barrel]]
[[Category: Lyase]]
[[Category: Tim barrel]]

Latest revision as of 10:02, 20 March 2024

CRYSTAL STRUCTURE OF UNACTIVATED TOBACCO RUBISCO WITH BOUND PHOSPHATE IONS

1ej7, resolution 2.45Å

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