View source for 3rub


==CRYSTAL STRUCTURE OF THE UNACTIVATED FORM OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE(SLASH)OXYGENASE FROM TOBACCO REFINED AT 2.0-ANGSTROMS RESOLUTION==
<StructureSection load='3rub' size='340' side='right'caption='[[3rub]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3rub]] 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=3RUB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3RUB FirstGlance]. <br>
</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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ASN:ASPARAGINE'>ASN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=3rub FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rub OCA], [https://pdbe.org/3rub PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3rub RCSB], [https://www.ebi.ac.uk/pdbsum/3rub PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3rub ProSAT]</span></td></tr>
</table>
== 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]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ru/3rub_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=3rub ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of the unactivated form of ribulose-1,5-bisphosphate carboxylase/oxygenase was refined at a resolution of 2.0 A to an R-factor of 17.1%. The previous model (Chapman et al., 1988) was extensively rebuilt, and the small subunit was retraced. The refined model consists of residues 22-63 and 69-467 of the large subunit and the complete small subunit. A striking feature of the model is that several loops have very high B-factors, probably representing mobile regions of the molecule. An examination of the intersubunit contacts shows that the L8S8 hexadecamer is composed of four L2 dimers. The dominant contacts between these L2 dimers are formed by the small subunits. This suggests that the small subunits may be essential for maintaining the integrity of the L8S8 structure. The active site shows differences between the unactivated form and the quaternary complex. In particular, Lys334 has moved out of the active site by about 10A. This residue lies on loop 6 of the alpha beta barrel, which is a particularly mobile loop. The site of ribulose-1,5-bisphosphate carboxylase/oxygenase activation is well ordered in the absence of the carbamylation of Lys201 and Mg2+ binding. The residues are held poised by a network of hydrogen bonds. In the unactivated state, the active site is accessible to substrate binding.

Crystal structure of the unactivated form of ribulose-1,5-bisphosphate carboxylase/oxygenase from tobacco refined at 2.0-A resolution.,Curmi PM, Cascio D, Sweet RM, Eisenberg D, Schreuder H J Biol Chem. 1992 Aug 25;267(24):16980-9. PMID:1512238<ref>PMID:1512238</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3rub" style="background-color:#fffaf0;"></div>

==See Also==
*[[RuBisCO 3D structures|RuBisCO 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Nicotiana tabacum]]
[[Category: Cascio D]]
[[Category: Chapman MS]]
[[Category: Curmi PMG]]
[[Category: Eisenberg DS]]
[[Category: Schreuder H]]
[[Category: Suh SW]]