1yfq

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[[Image:1yfq.gif|left|200px]]
 
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{{Structure
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==High resolution S. cerevisiae Bub3 mitotic checkpoint protein==
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|PDB= 1yfq |SIZE=350|CAPTION= <scene name='initialview01'>1yfq</scene>, resolution 1.1&Aring;
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<StructureSection load='1yfq' size='340' side='right'caption='[[1yfq]], [[Resolution|resolution]] 1.10&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>
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<table><tr><td colspan='2'>[[1yfq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YFQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1YFQ FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.1&#8491;</td></tr>
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|GENE= BUB3 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae])
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
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|DOMAIN=
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1yfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yfq OCA], [https://pdbe.org/1yfq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1yfq RCSB], [https://www.ebi.ac.uk/pdbsum/1yfq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1yfq ProSAT]</span></td></tr>
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|RELATEDENTRY=
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1yfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yfq OCA], [http://www.ebi.ac.uk/pdbsum/1yfq PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1yfq RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/BUB3_YEAST BUB3_YEAST] Required for cell cycle arrest in response to loss of microtubule function. Component of the spindle assembly checkpoint which is a feedback control that prevents cells with incompletely assembled spindles from leaving mitosis. Component of the mitotic checkpoint complex (MCC) which inhibits the ubiquitin ligase activity of the anaphase promoting complex/cyclosome (APC/C) by preventing its activation by CDC20. The formation of a MAD1-BUB1-BUB3 complex seems to be required for the spindle checkpoint mechanism.<ref>PMID:15879521</ref>
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== Evolutionary Conservation ==
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'''High resolution S. cerevisiae Bub3 mitotic checkpoint protein'''
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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==Overview==
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/yf/1yfq_consurf.spt"</scriptWhenChecked>
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Bub3p is a protein that mediates the spindle checkpoint, a signaling pathway that ensures correct chromosome segregation in organisms ranging from yeast to mammals. It is known to function by co-localizing at least two other proteins, Mad3p and the protein kinase Bub1p, to the kinetochore of chromosomes that are not properly attached to mitotic spindles, ultimately resulting in cell cycle arrest. Prior sequence analysis suggested that Bub3p was composed of three or four WD repeats (also known as WD40 and beta-transducin repeats), short sequence motifs appearing in clusters of 4-16 found in many hundreds of eukaryotic proteins that fold into four-stranded blade-like sheets. We have determined the crystal structure of Bub3p from Saccharomyces cerevisiae at 1.1 angstrom and a crystallographic R-factor of 15.3%, revealing seven authentic repeats. In light of this, it appears that many of these repeats therefore remain hidden in sequences of other proteins. Analysis of random and site-directed mutants identifies the surface of Bub3p involved in checkpoint function through binding of Bub1p and Mad3p. Sequence alignments indicate that these surfaces are mostly conserved across Bub3 proteins from diverse species. A structural comparison with other proteins containing WD repeats suggests that these folds may bind partner proteins using similar surface areas on the top and sides of the propeller. The sequences composing these regions are the most divergent within the repeat across all WD repeat proteins and could potentially be modulated to provide specificity in partner protein binding without perturbation of the core structure.
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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==About this Structure==
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</jmolCheckbox>
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1YFQ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YFQ OCA].
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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=1yfq ConSurf].
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<div style="clear:both"></div>
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==Reference==
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== References ==
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The 1.1-angstrom structure of the spindle checkpoint protein Bub3p reveals functional regions., Wilson DK, Cerna D, Chew E, J Biol Chem. 2005 Apr 8;280(14):13944-51. Epub 2005 Jan 11. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15644329 15644329]
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
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[[Category: Single protein]]
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[[Category: Cerna D]]
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[[Category: Cerna, D.]]
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[[Category: Chew E]]
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[[Category: Chew, E.]]
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[[Category: Wilson DK]]
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[[Category: Wilson, D K.]]
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[[Category: wd repeat wd40 repeat beta transducin repeat all beta]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:06:01 2008''
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Current revision

High resolution S. cerevisiae Bub3 mitotic checkpoint protein

PDB ID 1yfq

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