2bb2

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(New page: 200px<br /><applet load="2bb2" size="450" color="white" frame="true" align="right" spinBox="true" caption="2bb2, resolution 2.1&Aring;" /> '''X-RAY ANALYSIS OF BET...)
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[[Image:2bb2.jpg|left|200px]]<br /><applet load="2bb2" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2bb2, resolution 2.1&Aring;" />
 
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'''X-RAY ANALYSIS OF BETA B2-CRYSTALLIN AND EVOLUTION OF OLIGOMERIC LENS PROTEINS'''<br />
 
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==Overview==
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==X-RAY ANALYSIS OF BETA B2-CRYSTALLIN AND EVOLUTION OF OLIGOMERIC LENS PROTEINS==
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The beta, gamma-crystallins form a class of homologous proteins in the eye, lens. Each gamma-crystallin comprises four topologically equivalent, Greek, key motifs; pairs of motifs are organized around a local dyad to give, domains and two similar domains are in turn related by a further local, dyad. Sequence comparisons and model building predicted that, hetero-oligomeric beta-crystallins also had internally quadruplicated, subunits, but with extensions at the N and C termini, indicating that, beta, gamma-crystallins evolved in two duplication steps from an ancestral, protein folded as a Greek key. We report here the X-ray analysis at 2.1 A, resolution of beta B2-crystallin homodimer which shows that the connecting, peptide is extended and the two domains separated in a way quite unlike, gamma-crystallin. Domain interactions analogous to those within monomeric, gamma-crystallin are intermolecular and related by a crystallographic dyad, in the beta B2-crystallin dimer. This shows how oligomers can evolve by, conserving an interface rather than connectivity. A further interaction, between dimers suggests a model for more complex aggregates of, beta-crystallin in the lens.
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<StructureSection load='2bb2' size='340' side='right'caption='[[2bb2]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2bb2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BB2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BB2 FirstGlance]. <br>
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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]] 2.1&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene></td></tr>
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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=2bb2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bb2 OCA], [https://pdbe.org/2bb2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2bb2 RCSB], [https://www.ebi.ac.uk/pdbsum/2bb2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2bb2 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CRBB2_BOVIN CRBB2_BOVIN] Crystallins are the dominant structural components of the vertebrate eye lens.
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== Evolutionary Conservation ==
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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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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bb/2bb2_consurf.spt"</scriptWhenChecked>
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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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</jmolCheckbox>
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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=2bb2 ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The beta, gamma-crystallins form a class of homologous proteins in the eye lens. Each gamma-crystallin comprises four topologically equivalent, Greek key motifs; pairs of motifs are organized around a local dyad to give domains and two similar domains are in turn related by a further local dyad. Sequence comparisons and model building predicted that hetero-oligomeric beta-crystallins also had internally quadruplicated subunits, but with extensions at the N and C termini, indicating that beta, gamma-crystallins evolved in two duplication steps from an ancestral protein folded as a Greek key. We report here the X-ray analysis at 2.1 A resolution of beta B2-crystallin homodimer which shows that the connecting peptide is extended and the two domains separated in a way quite unlike gamma-crystallin. Domain interactions analogous to those within monomeric gamma-crystallin are intermolecular and related by a crystallographic dyad in the beta B2-crystallin dimer. This shows how oligomers can evolve by conserving an interface rather than connectivity. A further interaction between dimers suggests a model for more complex aggregates of beta-crystallin in the lens.
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==About this Structure==
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X-ray analysis of beta B2-crystallin and evolution of oligomeric lens proteins.,Bax B, Lapatto R, Nalini V, Driessen H, Lindley PF, Mahadevan D, Blundell TL, Slingsby C Nature. 1990 Oct 25;347(6295):776-80. PMID:2234050<ref>PMID:2234050</ref>
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2BB2 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with BME as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2BB2 OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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X-ray analysis of beta B2-crystallin and evolution of oligomeric lens proteins., Bax B, Lapatto R, Nalini V, Driessen H, Lindley PF, Mahadevan D, Blundell TL, Slingsby C, Nature. 1990 Oct 25;347(6295):776-80. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=2234050 2234050]
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</div>
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[[Category: Bos taurus]]
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<div class="pdbe-citations 2bb2" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Bax, B.]]
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[[Category: Blundell, T.L.]]
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[[Category: Driessen, H.]]
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[[Category: Lapatto, R.]]
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[[Category: Lindley, P.F.]]
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[[Category: Mahadevan, D.]]
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[[Category: Nalini, V.]]
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[[Category: Slingsby, C.]]
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[[Category: BME]]
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[[Category: eye lens protein]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 08:41:22 2007''
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==See Also==
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*[[Crystallin 3D structures|Crystallin 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Bos taurus]]
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[[Category: Large Structures]]
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[[Category: Bax B]]
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[[Category: Blundell TL]]
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[[Category: Driessen H]]
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[[Category: Lapatto R]]
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[[Category: Lindley PF]]
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[[Category: Mahadevan D]]
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[[Category: Nalini V]]
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[[Category: Slingsby C]]

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X-RAY ANALYSIS OF BETA B2-CRYSTALLIN AND EVOLUTION OF OLIGOMERIC LENS PROTEINS

PDB ID 2bb2

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