View source for 3zqm


==Crystal structure of the small terminase oligomerization core domain from a SPP1-like bacteriophage (crystal form 1)==
<StructureSection load='3zqm' size='340' side='right'caption='[[3zqm]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3zqm]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_phage_SF6 Bacillus phage SF6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZQM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZQM 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]] 1.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=3zqm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zqm OCA], [https://pdbe.org/3zqm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zqm RCSB], [https://www.ebi.ac.uk/pdbsum/3zqm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zqm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TERS_BPSF6 TERS_BPSF6] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Genome packaging into preformed viral procapsids is driven by powerful molecular motors. The small terminase protein is essential for the initial recognition of viral DNA and regulates the motor's ATPase and nuclease activities during DNA translocation. The crystal structure of a full-length small terminase protein from the Siphoviridae bacteriophage SF6, comprising the N-terminal DNA binding, the oligomerization core, and the C-terminal beta-barrel domains, reveals a nine-subunit circular assembly in which the DNA-binding domains are arranged around the oligomerization core in a highly flexible manner. Mass spectrometry analysis and four further crystal structures show that, although the full-length protein exclusively forms nine-subunit assemblies, protein constructs missing the C-terminal beta-barrel form both nine-subunit and ten-subunit assemblies, indicating the importance of the C terminus for defining the oligomeric state. The mechanism by which a ring-shaped small terminase oligomer binds viral DNA has not previously been elucidated. Here, we probed binding in vitro by using EPR and surface plasmon resonance experiments, which indicated that interaction with DNA is mediated exclusively by the DNA-binding domains and suggested a nucleosome-like model in which DNA binds around the outside of the protein oligomer.

Structural basis for DNA recognition and loading into a viral packaging motor.,Buttner CR, Chechik M, Ortiz-Lombardia M, Smits C, Ebong IO, Chechik V, Jeschke G, Dykeman E, Benini S, Robinson CV, Alonso JC, Antson AA Proc Natl Acad Sci U S A. 2011 Dec 29. PMID:22207627<ref>PMID:22207627</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3zqm" style="background-color:#fffaf0;"></div>

==See Also==
*[[Terminase 3D Structures|Terminase 3D Structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus phage SF6]]
[[Category: Large Structures]]
[[Category: Alonso JC]]
[[Category: Antson AA]]
[[Category: Benini S]]
[[Category: Buttner CR]]
[[Category: Chechik M]]
[[Category: Chechik V]]
[[Category: Dykeman E]]
[[Category: Jeschke G]]
[[Category: Ortiz-Lombardia M]]
[[Category: Smits C]]