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==CI-MOR repressor-antirepressor complex of the temperate bacteriophage TP901-1 from Lactococcus lactis==
<StructureSection load='6tri' size='340' side='right'caption='[[6tri]], [[Resolution|resolution]] 2.28&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6tri]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Lactococcus_phage_TP901-1 Lactococcus phage TP901-1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6TRI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6TRI 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]] 2.277&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=6tri FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6tri OCA], [https://pdbe.org/6tri PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6tri RCSB], [https://www.ebi.ac.uk/pdbsum/6tri PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6tri ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O48503_9CAUD O48503_9CAUD] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Temperate bacteriophages can enter one of two life cycles following infection of a sensitive host: the lysogenic or the lytic life cycle. The choice between the two alternative life cycles is dependent upon a tight regulation of promoters and their cognate regulatory proteins within the phage genome. We investigated the genetic switch of TP901-1, a bacteriophage of Lactococcus lactis, controlled by the CI repressor and the modulator of repression (MOR) antirepressor and their interactions with DNA. We determined the solution structure of MOR, and we solved the crystal structure of MOR in complex with the N-terminal domain of CI, revealing the structural basis of MOR inhibition of CI binding to the DNA operator sites. (15)N NMR Carr-Purcell-Meiboom-Gill (CPMG) relaxation dispersion and rotating frame R 1rho measurements demonstrate that MOR displays molecular recognition dynamics on two different time scales involving a repacking of aromatic residues at the interface with CI. Mutations in the CI:MOR binding interface impair complex formation in vitro, and when introduced in vivo, the bacteriophage switch is unable to choose the lytic life cycle showing that the CI:MOR complex is essential for proper functioning of the genetic switch. On the basis of sequence alignments, we show that the structural features of the MOR:CI complex are likely conserved among a larger family of bacteriophages from human pathogens implicated in transfer of antibiotic resistance.

Revealing the mechanism of repressor inactivation during switching of a temperate bacteriophage.,Rasmussen KK, Palencia A, Varming AK, El-Wali H, Boeri Erba E, Blackledge M, Hammer K, Herrmann T, Kilstrup M, Lo Leggio L, Jensen MR Proc Natl Acad Sci U S A. 2020 Aug 11. pii: 2005218117. doi:, 10.1073/pnas.2005218117. PMID:32788352<ref>PMID:32788352</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6tri" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Lactococcus phage TP901-1]]
[[Category: Large Structures]]
[[Category: Blackledge M]]
[[Category: Herrmann T]]
[[Category: Jensen MR]]
[[Category: Lo Leggio L]]
[[Category: Rasmussen KK]]