5fei

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==Crystal structure of the bacteriophage phi29 tail knob protein gp9 truncation variant==
==Crystal structure of the bacteriophage phi29 tail knob protein gp9 truncation variant==
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<StructureSection load='5fei' size='340' side='right' caption='[[5fei]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
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<StructureSection load='5fei' size='340' side='right'caption='[[5fei]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[5fei]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5FEI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5FEI FirstGlance]. <br>
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<table><tr><td colspan='2'>[[5fei]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_virus_phi29 Bacillus virus phi29]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5FEI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5FEI FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.604&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5fei FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5fei OCA], [http://pdbe.org/5fei PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5fei RCSB], [http://www.ebi.ac.uk/pdbsum/5fei PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5fei ProSAT]</span></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5fei FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5fei OCA], [https://pdbe.org/5fei PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5fei RCSB], [https://www.ebi.ac.uk/pdbsum/5fei PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5fei ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/DIT9_BPPH2 DIT9_BPPH2]] Forms the distal part (knob) of the tail tube.<ref>PMID:18606992</ref>
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[https://www.uniprot.org/uniprot/DIT9_BPPH2 DIT9_BPPH2] Forms the distal part (knob) of the tail tube.<ref>PMID:18606992</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Most bacteriophages are tailed bacteriophages with an isometric or a prolate head attached to a long contractile, long non-contractile, or short non-contractile tail. The tail is a complex machine that plays a central role in host cell recognition and attachment, cell wall and membrane penetration, and viral genome ejection. The mechanisms involved in the penetration of the inner host cell membrane by bacteriophage tails are not well understood. Here we describe structural and functional studies of the bacteriophage varphi29 tail knob protein gene product 9 (gp9). The 2.0 A crystal structure of gp9 shows that six gp9 molecules form a hexameric tube structure with six flexible hydrophobic loops blocking one end of the tube before DNA ejection. Sequence and structural analyses suggest that the loops in the tube could be membrane active. Further biochemical assays and electron microscopy structural analyses show that the six hydrophobic loops in the tube exit upon DNA ejection and form a channel that spans the lipid bilayer of the membrane and allows the release of the bacteriophage genomic DNA, suggesting that cell membrane penetration involves a pore-forming mechanism similar to that of certain non-enveloped eukaryotic viruses. A search of other phage tail proteins identified similar hydrophobic loops, which indicates that a common mechanism might be used for membrane penetration by prokaryotic viruses. These findings suggest that although prokaryotic and eukaryotic viruses use apparently very different mechanisms for infection, they have evolved similar mechanisms for breaching the cell membrane.
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The bacteriophage varphi29 tail possesses a pore-forming loop for cell membrane penetration.,Xu J, Gui M, Wang D, Xiang Y Nature. 2016 Jun 15;534(7608):544-7. doi: 10.1038/nature18017. PMID:27309813<ref>PMID:27309813</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 5fei" style="background-color:#fffaf0;"></div>
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== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Gui, M]]
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[[Category: Bacillus virus phi29]]
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[[Category: Wang, D H]]
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[[Category: Large Structures]]
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[[Category: Xiang, Y]]
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[[Category: Gui M]]
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[[Category: Xu, J W]]
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[[Category: Wang DH]]
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[[Category: Bacteriophage phi29]]
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[[Category: Xiang Y]]
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[[Category: Tail knob]]
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[[Category: Xu JW]]
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[[Category: Viral protein]]
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Current revision

Crystal structure of the bacteriophage phi29 tail knob protein gp9 truncation variant

PDB ID 5fei

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