View source for 6of7


==Crystal structure of the CRY1-PER2 complex==
<StructureSection load='6of7' size='340' side='right'caption='[[6of7]], [[Resolution|resolution]] 3.11&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6of7]] is a 2 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=6OF7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6OF7 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]] 3.11&#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=6of7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6of7 OCA], [https://pdbe.org/6of7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6of7 RCSB], [https://www.ebi.ac.uk/pdbsum/6of7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6of7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CRY1_MOUSE CRY1_MOUSE] Blue light-dependent regulator of the circadian feedback loop. Inhibits CLOCK|NPAS2-ARNTL E box-mediated transcription. Acts, in conjunction with CRY2, in maintaining period length and circadian rhythmicity. Has no photolyase activity. Capable of translocating circadian clock core proteins such as PER proteins to the nucleus. May inhibit CLOCK|NPAS2-ARNTL transcriptional activity through stabilizing the unphosphorylated form of ARNTL.<ref>PMID:10428031</ref> <ref>PMID:16628007</ref> <ref>PMID:16478995</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mammalian circadian rhythms are generated by a transcription-based feedback loop in which CLOCK:BMAL1 drives transcription of its repressors (PER1/2, CRY1/2), which ultimately interact with CLOCK:BMAL1 to close the feedback loop with ~24 hr periodicity. Here we pinpoint a key difference between CRY1 and CRY2 that underlies their differential strengths as transcriptional repressors. Both cryptochromes bind the BMAL1 transactivation domain similarly to sequester it from coactivators and repress CLOCK:BMAL1 activity. However, we find that CRY1 is recruited with much higher affinity to the PAS domain core of CLOCK:BMAL1, allowing it to serve as a stronger repressor that lengthens circadian period. We discovered a dynamic serine-rich loop adjacent to the secondary pocket in the photolyase homology region (PHR) domain that regulates differential binding of cryptochromes to the PAS domain core of CLOCK:BMAL1. Notably, binding of the co-repressor PER2 remodels the serine loop of CRY2, making it more CRY1-like and enhancing its affinity for CLOCK:BMAL1.

Dynamics at the serine loop underlie differential affinity of cryptochromes for CLOCK:BMAL1 to control circadian timing.,Fribourgh JL, Srivastava A, Sandate CR, Michael AK, Hsu PL, Rakers C, Nguyen LT, Torgrimson MR, Parico GCG, Tripathi S, Zheng N, Lander GC, Hirota T, Tama F, Partch CL Elife. 2020 Feb 26;9. pii: 55275. doi: 10.7554/eLife.55275. PMID:32101164<ref>PMID:32101164</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6of7" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cryptochrome 3D structures|Cryptochrome 3D structures]]
*[[Period circadian protein|Period circadian protein]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Fribourgh JL]]
[[Category: Michael AK]]
[[Category: Partch CL]]
[[Category: Tripathi SM]]