View source for 1uzd

==CHLAMYDOMONAS,SPINACH CHIMERIC RUBISCO==
<StructureSection load='1uzd' size='340' side='right' caption='[[1uzd]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1uzd]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Chlre Chlre] and [http://en.wikipedia.org/wiki/Chlamydomonas_reinhardtii Chlamydomonas reinhardtii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UZD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1UZD 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=EDO:1,2-ETHANEDIOL'>EDO</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=HYP:4-HYDROXYPROLINE'>HYP</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=SMC:S-METHYLCYSTEINE'>SMC</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1gk8|1gk8]], [[1ir2|1ir2]], [[1uw9|1uw9]], [[1uwa|1uwa]], [[1uzh|1uzh]], [[1aa1|1aa1]], [[1aus|1aus]], [[1ir1|1ir1]], [[1upm|1upm]], [[1upp|1upp]]</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=1uzd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uzd OCA], [http://pdbe.org/1uzd PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1uzd RCSB], [http://www.ebi.ac.uk/pdbsum/1uzd PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/RBL_CHLRE RBL_CHLRE]] 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] [[http://www.uniprot.org/uniprot/RBS1_CHLRE RBS1_CHLRE]] 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 ==
[[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/uz/1uzd_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1uzd ConSurf].
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== Publication Abstract from PubMed ==
Comparison of subunit sequences and X-ray crystal structures of ribulose-1,5-bisphosphate carboxylase/oxygenase indicates that the loop between beta-strands A and B of the small subunit is one of the most variable regions of the holoenzyme. In prokaryotes and nongreen algae, the loop contains 10 residues. In land plants and green algae, the loop is comprised of approximately 22 and 28 residues, respectively. Previous studies indicated that the longer betaA-betaB loop was required for the assembly of cyanobacterial small subunits with plant large subunits in isolated chloroplasts. In the present study, chimeric small subunits were constructed by replacing the loop of the green alga Chlamydomonas reinhardtii with the sequences of Synechococcus or spinach. When these engineered genes were transformed into a Chlamydomonas mutant that lacks small-subunit genes, photosynthesis-competent colonies were recovered, indicating that loop size is not essential for holoenzyme assembly. Whereas the Synechococcus loop causes decreases in carboxylation V(max), K(m)(O(2)), and CO(2)/O(2) specificity, the spinach loop causes complementary decreases in carboxylation V(max), K(m)(O(2)), and K(m)(CO(2)) without a change in specificity. X-ray crystal structures of the engineered proteins reveal remarkable similarity between the introduced betaA-betaB loops and the respective loops in the Synechococcus and spinach enzymes. The side chains of several large-subunit residues are altered in regions previously shown by directed mutagenesis to influence CO(2)/O(2) specificity. Differences in the catalytic properties of divergent Rubisco enzymes may arise from differences in the small-subunit betaA-betaB loop. This loop may be a worthwhile target for genetic engineering aimed at improving photosynthetic CO(2) fixation.

Chimeric small subunits influence catalysis without causing global conformational changes in the crystal structure of ribulose-1,5-bisphosphate carboxylase/oxygenase.,Karkehabadi S, Peddi SR, Anwaruzzaman M, Taylor TC, Cederlund A, Genkov T, Andersson I, Spreitzer RJ Biochemistry. 2005 Jul 26;44(29):9851-61. PMID:16026157<ref>PMID:16026157</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 1uzd" style="background-color:#fffaf0;"></div>

==See Also==
*[[RuBisCO|RuBisCO]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Chlamydomonas reinhardtii]]
[[Category: Chlre]]
[[Category: Ribulose-bisphosphate carboxylase]]
[[Category: Andersson, I]]
[[Category: Karkehabadi, S]]
[[Category: Spreitzer, R J]]
[[Category: Carbon dioxide fixation]]
[[Category: Chloroplast]]
[[Category: Lyase]]
[[Category: Monooxygenase]]
[[Category: Multigene family]]
[[Category: Oxidoreductase]]
[[Category: Photorespiration]]
[[Category: Photosynthesis]]
[[Category: Rubisco]]
[[Category: Transit peptide]]