View source for 8osl


==Cryo-EM structure of CLOCK-BMAL1 bound to the native Por enhancer nucleosome (map 2, additional 3D classification and flexible refinement)==
<StructureSection load='8osl' size='340' side='right'caption='[[8osl]], [[Resolution|resolution]] 4.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8osl]] is a 14 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8OSL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8OSL FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4.9&#8491;</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=8osl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8osl OCA], [https://pdbe.org/8osl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8osl RCSB], [https://www.ebi.ac.uk/pdbsum/8osl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8osl ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/H31_HUMAN H31_HUMAN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The basic helix-loop-helix (bHLH) family of transcription factors recognizes DNA motifs known as E-boxes (CANNTG) and includes 108 members(1). Here we investigate how chromatinized E-boxes are engaged by two structurally diverse bHLH proteins: the proto-oncogene MYC-MAX and the circadian transcription factor CLOCK-BMAL1 (refs. (2,3)). Both transcription factors bind to E-boxes preferentially near the nucleosomal entry-exit sites. Structural studies with engineered or native nucleosome sequences show that MYC-MAX or CLOCK-BMAL1 triggers the release of DNA from histones to gain access. Atop the H2A-H2B acidic patch(4), the CLOCK-BMAL1 Per-Arnt-Sim (PAS) dimerization domains engage the histone octamer disc. Binding of tandem E-boxes(5-7) at endogenous DNA sequences occurs through direct interactions between two CLOCK-BMAL1 protomers and histones and is important for circadian cycling. At internal E-boxes, the MYC-MAX leucine zipper can also interact with histones H2B and H3, and its binding is indirectly enhanced by OCT4 elsewhere on the nucleosome. The nucleosomal E-box position and the type of bHLH dimerization domain jointly determine the histone contact, the affinity and the degree of competition and cooperativity with other nucleosome-bound factors.

Cooperation between bHLH transcription factors and histones for DNA access.,Michael AK, Stoos L, Crosby P, Eggers N, Nie XY, Makasheva K, Minnich M, Healy KL, Weiss J, Kempf G, Cavadini S, Kater L, Seebacher J, Vecchia L, Chakraborty D, Isbel L, Grand RS, Andersch F, Fribourgh JL, Schubeler D, Zuber J, Liu AC, Becker PB, Fierz B, Partch CL, Menet JS, Thoma NH Nature. 2023 Jul;619(7969):385-393. doi: 10.1038/s41586-023-06282-3. Epub 2023 , Jul 5. PMID:37407816<ref>PMID:37407816</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8osl" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Cavadini S]]
[[Category: Kempf G]]
[[Category: Michael AK]]
[[Category: Stoos L]]
[[Category: Thoma N]]