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| | ==NMR structure of the Bak transmembrane helix in lipid nanodiscs== | | ==NMR structure of the Bak transmembrane helix in lipid nanodiscs== |
| - | <StructureSection load='7ofo' size='340' side='right'caption='[[7ofo]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | + | <StructureSection load='7ofo' size='340' side='right'caption='[[7ofo]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[7ofo]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OFO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OFO FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7ofo]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OFO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OFO FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[7ofm|7ofm]]</div></td></tr> | + | </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=7ofo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ofo OCA], [https://pdbe.org/7ofo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ofo RCSB], [https://www.ebi.ac.uk/pdbsum/7ofo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ofo ProSAT]</span></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">BAK1, BAK, BCL2L7, CDN1 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=7ofo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ofo OCA], [https://pdbe.org/7ofo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ofo RCSB], [https://www.ebi.ac.uk/pdbsum/7ofo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ofo ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/BAK_HUMAN BAK_HUMAN]] In the presence of an appropriate stimulus, accelerates programmed cell death by binding to, and antagonizing the anti-apoptotic action of BCL2 or its adenovirus homolog E1B 19k protein. Low micromolar levels of zinc ions inhibit the promotion of apoptosis.<ref>PMID:8521816</ref> <ref>PMID:17157251</ref>
| + | [https://www.uniprot.org/uniprot/BAK_HUMAN BAK_HUMAN] In the presence of an appropriate stimulus, accelerates programmed cell death by binding to, and antagonizing the anti-apoptotic action of BCL2 or its adenovirus homolog E1B 19k protein. Low micromolar levels of zinc ions inhibit the promotion of apoptosis.<ref>PMID:8521816</ref> <ref>PMID:17157251</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 7ofo" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 7ofo" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[B-cell lymphoma proteins 3D structures|B-cell lymphoma proteins 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Hagn, F]] | + | [[Category: Hagn F]] |
| - | [[Category: Sperl, L E]] | + | [[Category: Sperl LE]] |
| - | [[Category: Apoptosis]]
| + | |
| - | [[Category: Bcl2 protein]]
| + | |
| - | [[Category: Mitochondria]]
| + | |
| - | [[Category: Pore formation]]
| + | |
| Structural highlights
Function
BAK_HUMAN In the presence of an appropriate stimulus, accelerates programmed cell death by binding to, and antagonizing the anti-apoptotic action of BCL2 or its adenovirus homolog E1B 19k protein. Low micromolar levels of zinc ions inhibit the promotion of apoptosis.[1] [2]
Publication Abstract from PubMed
Permeabilization of the outer mitochondrial membrane by pore-forming Bcl2 proteins is a crucial step for the induction of apoptosis. Despite a large set of data suggesting global conformational changes within pro-apoptotic Bak during pore formation, high-resolution structural details in a membrane environment remain sparse. Here, we used NMR and HDX-MS (Hydrogen deuterium exchange mass spectrometry) in lipid nanodiscs to gain important high-resolution structural insights into the conformational changes of Bak at the membrane that are dependent on a direct activation by BH3-only proteins. Furthermore, we determined the first high-resolution structure of the Bak transmembrane helix. Upon activation, alpha-helix 1 in the soluble domain of Bak dissociates from the protein and adopts an unfolded and dynamic potentially membrane-bound state. In line with this finding, comparative protein folding experiments with Bak and anti-apoptotic BclxL suggest that alpha-helix 1 in Bak is a metastable structural element contributing to its pro-apoptotic features. Consequently, mutagenesis experiments aimed at stabilizing alpha-helix 1 yielded Bak variants with delayed pore-forming activity. These insights will contribute to a better mechanistic understanding of Bak-mediated membrane permeabilization.
High-resolution analysis of the conformational transition of pro-apoptotic Bak at the lipid membrane.,Sperl LE, Ruhrnossl F, Schiller A, Haslbeck M, Hagn F EMBO J. 2021 Oct 18;40(20):e107159. doi: 10.15252/embj.2020107159. Epub 2021 Sep , 15. PMID:34523144[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Chittenden T, Flemington C, Houghton AB, Ebb RG, Gallo GJ, Elangovan B, Chinnadurai G, Lutz RJ. A conserved domain in Bak, distinct from BH1 and BH2, mediates cell death and protein binding functions. EMBO J. 1995 Nov 15;14(22):5589-96. PMID:8521816
- ↑ Moldoveanu T, Liu Q, Tocilj A, Watson M, Shore G, Gehring K. The X-ray structure of a BAK homodimer reveals an inhibitory zinc binding site. Mol Cell. 2006 Dec 8;24(5):677-88. PMID:17157251 doi:10.1016/j.molcel.2006.10.014
- ↑ Sperl LE, Ruhrnossl F, Schiller A, Haslbeck M, Hagn F. High-resolution analysis of the conformational transition of pro-apoptotic Bak at the lipid membrane. EMBO J. 2021 Oct 18;40(20):e107159. doi: 10.15252/embj.2020107159. Epub 2021 Sep , 15. PMID:34523144 doi:http://dx.doi.org/10.15252/embj.2020107159
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