1k28
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(New page: 200px<br /><applet load="1k28" size="450" color="white" frame="true" align="right" spinBox="true" caption="1k28, resolution 2.9Å" /> '''The Structure of the ...)
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Revision as of 16:40, 20 November 2007
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The Structure of the Bacteriophage T4 Cell-Puncturing Device
Overview
Bacteriophage T4 has a very efficient mechanism for infecting cells. The, key component of this process is the baseplate, located at the end of the, phage tail, which regulates the interaction of the tail fibres and the DNA, ejection machine. A complex of gene product (gp) 5 (63K) and gp27 (44K), the central part of the baseplate, is required to penetrate the outer cell, membrane of Escherichia coli and to disrupt the intermembrane, peptidoglycan layer, promoting subsequent entry of phage DNA into the, host. We present here a crystal structure of the (gp5-gp27)3 321K complex, determined to 2.9 A resolution and fitted into a cryo-electron microscopy, map at 17 A resolution of the baseplate-tail tube assembly. The, carboxy-terminal domain of gp5 is a triple-stranded beta-helix that forms, an equilateral triangular prism, which acts as a membrane-puncturing, needle. The middle lysozyme domain of gp5, situated on the periphery of, the prism, serves to digest the peptidoglycan layer. The amino-terminal, antiparallel beta-barrel domain of gp5 is inserted into a cylinder formed, by three gp27 monomers, which may serve as a channel for DNA ejection.
About this Structure
1K28 is a Protein complex structure of sequences from Bacteriophage t4 with K and PO4 as ligands. Active as Lysozyme, with EC number 3.2.1.17 Full crystallographic information is available from OCA.
Reference
Structure of the cell-puncturing device of bacteriophage T4., Kanamaru S, Leiman PG, Kostyuchenko VA, Chipman PR, Mesyanzhinov VV, Arisaka F, Rossmann MG, Nature. 2002 Jan 31;415(6871):553-7. PMID:11823865
Page seeded by OCA on Tue Nov 20 18:47:24 2007
