View source for 1wth


==Crystal structure of gp5-S351L mutant and gp27 complex==
<StructureSection load='1wth' size='340' side='right'caption='[[1wth]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1wth]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_T4 Escherichia virus T4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WTH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1WTH 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=1wth FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wth OCA], [https://pdbe.org/1wth PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1wth RCSB], [https://www.ebi.ac.uk/pdbsum/1wth PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1wth ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NEEDL_BPT4 NEEDL_BPT4] Tail-associated lysozyme of the baseplate hub that is essential for localized hydrolysis of bacterial cell wall necessary for viral DNA injection. The needle-like gp5 protein punctures the outer cell membrane and then digests the peptidoglycan cell wall in the periplasmic space. Involved in the tail assembly.<ref>PMID:12837775</ref> <ref>PMID:21129200</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/wt/1wth_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1wth ConSurf].
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<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Bacteriophage T4 has an efficient mechanism for injecting the host Escherichiacoli cell with genomic DNA. Its gene product 5 (gp5) has a needle-like structure attached to the end of a tube through which the DNA passes on its way out of the head and into the host. The gp5 needle punctures the outer cell membrane and then digests the peptidoglycan cell wall in the periplasmic space. gp5 is normally post-translationally cleaved between residues 351 and 352. The function of this process in controlling the lysozyme activity of gp5 has now been investigated. When gp5 is over-expressed in E.coli, two mutants (S351H and S351A) showed a reduction of cleavage products and five other mutants (S351L, S351K, S351Y, S351Q, and S351T) showed no cleavage. Furthermore, in a complementation assay at 20 degrees C, the mutants that had no cleavage of gp5 produced a reduced number of plaques compared to wild-type T4. The crystal structure of the non-cleavage phenotype mutant of gp5, S351L, complexed with gene product 27, showed that the 18 residues in the vicinity of the potential cleavage site (disordered in the wild-type structure) had visible electron density. The polypeptide around the potential cleavage site is exposed, thus allowing access for an E.coli protease. The lysozyme activity is inhibited in the wild-type structure by a loop from the adjacent gp5 monomer that binds into the substrate-binding site. The same inhibition is apparent in the mutant structure, showing that the lysozyme is inhibited before gp5 is cleaved and, presumably, the lysozyme is activated only after gp5 has penetrated the outer membrane.

Control of bacteriophage T4 tail lysozyme activity during the infection process.,Kanamaru S, Ishiwata Y, Suzuki T, Rossmann MG, Arisaka F J Mol Biol. 2005 Mar 4;346(4):1013-20. Epub 2005 Jan 25. PMID:15701513<ref>PMID:15701513</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 1wth" style="background-color:#fffaf0;"></div>

==See Also==
*[[Lysozyme 3D structures|Lysozyme 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia virus T4]]
[[Category: Large Structures]]
[[Category: Arisaka F]]
[[Category: Ishiwata Y]]
[[Category: Kanamaru S]]
[[Category: Rossmann MG]]
[[Category: Suzuki T]]