View source for 6st2


==Selective Affimers Recognize BCL-2 Family Proteins Through Non-Canonical Structural Motifs==
<StructureSection load='6st2' size='340' side='right'caption='[[6st2]], [[Resolution|resolution]] 1.79&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6st2]] is a 4 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=6ST2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ST2 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]] 1.79&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=6st2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6st2 OCA], [https://pdbe.org/6st2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6st2 RCSB], [https://www.ebi.ac.uk/pdbsum/6st2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6st2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/B2CL1_HUMAN B2CL1_HUMAN] Potent inhibitor of cell death. Inhibits activation of caspases (By similarity). Appears to regulate cell death by blocking the voltage-dependent anion channel (VDAC) by binding to it and preventing the release of the caspase activator, CYC1, from the mitochondrial membrane. Also acts as a regulator of G2 checkpoint and progression to cytokinesis during mitosis.<ref>PMID:19917720</ref> <ref>PMID:21840391</ref>   Isoform Bcl-X(S) promotes apoptosis.<ref>PMID:19917720</ref> <ref>PMID:21840391</ref> 
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== Publication Abstract from PubMed ==
The BCL-2 family is a challenging group of proteins to target selectively due to sequence and structural homologies across the family. Selective ligands for the BCL-2 family regulators of apoptosis are useful as probes to understand cell biology and apoptotic signalling pathways, and as starting points for inhibitor design. We have used phage display to isolate Affimer reagents (non-antibody binding proteins based on a conserved scaffold) to identify ligands for MCL-1, BCL-xL, BCL-2, BAK and BAX, then used multiple biophysical characterisation methods to probe the interactions. We established that purified Affimers elicit selective recognition of their target BCL-2 protein. For anti-apoptotic targets BCL-xL and MCL-1, competitive inhibition of their canonical protein-protein interactions is demonstrated. Co-crystal structures reveal an unprecedented mode of molecular recognition; where a BH3 helix is normally bound, flexible loops from the Affimer dock into the BH3 binding cleft. Moreover, the Affimers induce a change in the target proteins towards a desirable drug bound like conformation. These proof of concept studies indicate that Affimers could be used as alternative templates to inspire design of selective BCL-2 family modulators and more generally other protein-protein interaction inhibitors.

Selective Affimers Recognize the BCL-2 Family Proteins BCL-xL and MCL-1 through Non-Canonical Structural Motifs.,Miles J, Hobor F, Trinh C, Taylor J, Tiede C, Rowell P, Jackson B, Nadat F, Ramsahye P, Kyle H, Wicky B, Clarke J, Tomlinson D, Wilson A, Edwards T Chembiochem. 2020 Sep 22. doi: 10.1002/cbic.202000585. PMID:32961017<ref>PMID:32961017</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 6st2" style="background-color:#fffaf0;"></div>

==See Also==
*[[B-cell lymphoma proteins 3D structures|B-cell lymphoma proteins 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Clarke J]]
[[Category: Edwards TA]]
[[Category: Hobor F]]
[[Category: Jackson B]]
[[Category: Kyle HF]]
[[Category: Miles JA]]
[[Category: Nadat F]]
[[Category: Rowell PR]]
[[Category: Taylor J]]
[[Category: Tiede C]]
[[Category: Tomlinson DC]]
[[Category: Trinh CH]]
[[Category: Wicky BIM]]
[[Category: Wilson AJ]]