3ejc: Difference between revisions

<table><tr><td colspan='2'>[[3ejc]] is a 1 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=3EJC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3EJC 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='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3ejc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ejc OCA], [https://pdbe.org/3ejc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ejc RCSB], [https://www.ebi.ac.uk/pdbsum/3ejc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ejc ProSAT]</span></td></tr>

    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ej/3ejc_consurf.spt"</scriptWhenChecked>

    <text>to colour the structure by Evolutionary Conservation</text>

</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3ejc ConSurf].

P335 lactococcal phages infect the gram(+) bacterium Lactococcus lactis using a large multiprotein complex located at the distal part of the tail and termed baseplate (BP). The BP harbors the receptor-binding proteins (RBPs), which allow the specific recognition of saccharidic receptors localized on the host cell surface. We report here the electron microscopic structure of the phage TP901-1 wild-type BP as well as those of two mutants bppL (-) and bppU(-), lacking BppL (the RBPs) or both peripheral BP components (BppL and BppU), respectively. We also achieved an electron microscopic reconstruction of a partial BP complex, formed by BppU and BppL. This complex exhibits a tripod shape and is composed of nine BppLs and three BppUs. These structures, combined with light-scattering measurements, led us to propose that the TP901-1 BP harbors six tripods at its periphery, located around the central tube formed by ORF46 (Dit) hexamers, at its proximal end, and a ORF47 (Tal) trimer at its distal extremity. A total of 54 BppLs (18 RBPs) are thus available to mediate host anchoring with a large apparent avidity. TP901-1 BP exhibits an infection-ready conformation and differs strikingly from the lactococcal phage p2 BP, bearing only 6 RBPs, and which needs a conformational change to reach its activated state. The comparison of several Siphoviridae structures uncovers a close organization of their central BP core whereas striking differences occur at the periphery, leading to diverse mechanisms of host recognition.

Structure and molecular assignment of lactococcal phage TP901-1 baseplate.,Bebeacua C, Bron P, Lai L, Vegge CS, Brondsted L, Spinelli S, Campanacci V, Veesler D, van Heel M, Cambillau C J Biol Chem. 2010 Dec 10;285(50):39079-86. Epub 2010 Oct 11. PMID:20937834<ref>PMID:20937834</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

<div class="pdbe-citations 3ejc" style="background-color:#fffaf0;"></div>

== References ==

<references/>

</StructureSection>

[[Category: Lactococcus phage TP901-1]]

[[Category: Large Structures]]

[[Category: Blangy S]]

[[Category: Cambillau C]]

[[Category: Campanacci V]]

[[Category: Lichiere J]]

[[Category: Sciara G]]

[[Category: Spinelli S]]