View source for 7usf


==Mouse mammary tumor virus strand transfer complex intasome==
<StructureSection load='7usf' size='340' side='right'caption='[[7usf]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7usf]] is a 7 chain structure with sequence from [https://en.wikipedia.org/wiki/Mouse_mammary_tumor_virus Mouse mammary tumor virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7USF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7USF FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=7usf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7usf OCA], [https://pdbe.org/7usf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7usf RCSB], [https://www.ebi.ac.uk/pdbsum/7usf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7usf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O56220_MMTV O56220_MMTV] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Integration into host target DNA (tDNA), a hallmark of retroviral replication, is mediated by the intasome, a multimer of integrase (IN) assembled on viral DNA (vDNA) ends. To ascertain aspects of tDNA recognition during integration, we have solved the 3.5 A resolution cryo-EM structure of the mouse mammary tumor virus (MMTV) strand transfer complex (STC) intasome. The tDNA adopts an A-like conformation in the region encompassing the sites of vDNA joining, which exposes the sugar-phosphate backbone for IN-mediated strand transfer. Examination of existing retroviral STC structures revealed conservation of A-form tDNA in the analogous regions of these complexes. Furthermore, analyses of sequence preferences in genomic integration sites selectively targeted by six different retroviruses highlighted consistent propensity for A-philic sequences at the sites of vDNA joining. Our structure additionally revealed several novel MMTV IN-DNA interactions, as well as contacts seen in prior STC structures, including conserved Pro125 and Tyr149 residues interacting with tDNA. In infected cells, Pro125 substitutions impacted the global pattern of MMTV integration without significantly altering local base sequence preferences at vDNA insertion sites. Collectively, these data advance our understanding of retroviral intasome structure and function, as well as factors that influence patterns of vDNA integration in genomic DNA.

B-to-A transition in target DNA during retroviral integration.,Jozwik IK, Li W, Zhang DW, Wong D, Grawenhoff J, Ballandras-Colas A, Aiyer S, Cherepanov P, Engelman AN, Lyumkis D Nucleic Acids Res. 2022 Aug 10. pii: 6659873. doi: 10.1093/nar/gkac644. PMID:35947647<ref>PMID:35947647</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7usf" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mouse mammary tumor virus]]
[[Category: Jozwik I]]
[[Category: Lyumkis D]]