View source for 7gva


==Crystal Structure of B-cell lymphoma 6 protein BTB domain in complex with ligand 3 at 5.80 MGy X-ray dose==
<StructureSection load='7gva' size='340' side='right'caption='[[7gva]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7gva]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7GVA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7GVA 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]] 1.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1ACL:5-[[5,6-bis(chloranyl)pyrimidin-4-yl]amino]-1,3-dihydroindol-2-one'>A1ACL</scene>, <scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</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=7gva FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7gva OCA], [https://pdbe.org/7gva PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7gva RCSB], [https://www.ebi.ac.uk/pdbsum/7gva PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7gva ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/BCL6_HUMAN BCL6_HUMAN] Note=Chromosomal aberrations involving BCL6 may be a cause of B-cell non-Hodgkin lymphoma. Translocation t(3;14)(q27;q32); translocation t(3;22)(q27;q11) with immunoglobulin gene regions.  Note=A chromosomal aberration involving BCL6 may be a cause of a form of B-cell leukemia. Translocation t(3;11)(q27;q23) with POU2AF1/OBF1.  Note=A chromosomal aberration involving BCL6 may be a cause of lymphoma. Translocation t(3;4)(q27;p11) with ARHH/TTF.
== Function ==
[https://www.uniprot.org/uniprot/BCL6_HUMAN BCL6_HUMAN] Transcriptional repressor which is required for germinal center formation and antibody affinity maturation. Probably plays an important role in lymphomagenesis.<ref>PMID:9649500</ref> <ref>PMID:18280243</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Protein-inhibitor crystal structures aid medicinal chemists in efficiently improving the potency and selectivity of small-molecule inhibitors. It is estimated that a quarter of lead molecules in drug discovery projects are halogenated. Protein-inhibitor crystal structures have shed light on the role of halogen atoms in ligand binding. They form halogen bonds with protein atoms and improve shape complementarity of inhibitors with protein binding sites. However, specific radiation damage (SRD) can cause cleavage of carbon-halogen (C-X) bonds during X-ray diffraction data collection. This study shows significant C-X bond cleavage in protein-ligand structures of the therapeutic cancer targets B-cell lymphoma 6 (BCL6) and heat shock protein 72 (HSP72) complexed with halogenated ligands, which is dependent on the type of halogen and chemical structure of the ligand. The study found that metrics used to evaluate the fit of the ligand to the electron density deteriorated with increasing X-ray dose, and that SRD eliminated the anomalous signal from brominated ligands. A point of diminishing returns is identified, where collecting highly redundant data reduces the anomalous signal that may be used to identify binding sites of low-affinity ligands or for experimental phasing. Straightforward steps are proposed to mitigate the effects of C-X bond cleavage on structures of proteins bound to halogenated ligands and to improve the success of anomalous scattering experiments.

Specific radiation damage to halogenated inhibitors and ligands in protein-ligand crystal structures.,Rodrigues MJ, Cabry M, Collie G, Carter M, McAndrew C, Owen RL, Bellenie BR, Le Bihan YV, van Montfort RLM J Appl Crystallogr. 2024 Nov 26;57(Pt 6):1951-1965. doi: , 10.1107/S1600576724010549. eCollection 2024 Dec 1. PMID:39628887<ref>PMID:39628887</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7gva" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Le Bihan YV]]
[[Category: Rodrigues MJ]]
[[Category: Van Montfort RLM]]