View source for 3al3


==Crystal Structure of TopBP1 BRCT7/8-BACH1 peptide complex==
<StructureSection load='3al3' size='340' side='right'caption='[[3al3]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3al3]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AL3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AL3 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]] 2.15&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</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=3al3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3al3 OCA], [https://pdbe.org/3al3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3al3 RCSB], [https://www.ebi.ac.uk/pdbsum/3al3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3al3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TOPB1_HUMAN TOPB1_HUMAN] Required for DNA replication. Plays a role in the rescue of stalled replication forks and checkpoint control. Binds double-stranded DNA breaks and nicks as well as single-stranded DNA. Recruits the SWI/SNF chromatin remodeling complex to E2F1-responsive promoters. Down-regulates E2F1 activity and inhibits E2F1-dependent apoptosis during G1/S transition and after DNA damage. Induces a large increase in the kinase activity of ATR.<ref>PMID:10498869</ref> <ref>PMID:11395493</ref> <ref>PMID:11714696</ref> <ref>PMID:12697828</ref> <ref>PMID:15075294</ref> <ref>PMID:16530042</ref> 
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== Publication Abstract from PubMed ==
The diverse roles of TopBP1 in DNA replication and checkpoint signaling are associated with the scaffolding ability of TopBP1 to initiate various protein-protein interactions. The recognition of the BACH1/FANCJ helicase by TopBP1 is critical for the activation of the DNA replication checkpoint at stalled replication forks and is facilitated by the C-terminal tandem BRCT7/8 domains of TopBP1 and a phosphorylated Thr(1133) binding motif in BACH1. Here we provide the structural basis for this interaction through analysis of the x-ray crystal structures of TopBP1 BRCT7/8 both free and in complex with a BACH1 phospho-peptide. In contrast to canonical BRCT-phospho-peptide recognition, TopBP1 BRCT7/8 undergoes a dramatic conformational change upon BACH1 binding such that the two BRCT repeats pivot about the central BRCT-BRCT interface to provide an extensive and deep peptide-binding cleft. Additionally, we provide the first structural mechanism for Thr(P) recognition among BRCT domains. Together with systematic mutagenesis studies, we highlight the role of key contacts in governing the unique specificity of the TopBP1-BACH1 interaction.

Molecular basis of BACH1/FANCJ recognition by TopBP1 in DNA replication checkpoint control.,Leung CC, Gong Z, Chen J, Glover JN J Biol Chem. 2011 Feb 11;286(6):4292-301. Epub 2010 Dec 2. PMID:21127055<ref>PMID:21127055</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 3al3" style="background-color:#fffaf0;"></div>

==See Also==
*[[Topoisomerase binding protein|Topoisomerase binding protein]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Glover JN]]
[[Category: Leung CC]]