1k28: Difference between revisions
New page: left|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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[[Image:1k28.jpg|left|200px]]<br /><applet load="1k28" size=" | [[Image:1k28.jpg|left|200px]]<br /><applet load="1k28" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1k28, resolution 2.9Å" /> | caption="1k28, resolution 2.9Å" /> | ||
'''The Structure of the Bacteriophage T4 Cell-Puncturing Device'''<br /> | '''The Structure of the Bacteriophage T4 Cell-Puncturing Device'''<br /> | ||
==Overview== | ==Overview== | ||
Bacteriophage T4 has a very efficient mechanism for infecting cells. The | 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== | ==About this Structure== | ||
1K28 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacteriophage_t4 Bacteriophage t4] with K and PO4 as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] Full crystallographic information is available from [http:// | 1K28 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacteriophage_t4 Bacteriophage t4] with <scene name='pdbligand=K:'>K</scene> and <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K28 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Arisaka, F.]] | [[Category: Arisaka, F.]] | ||
[[Category: Chipman, P | [[Category: Chipman, P R.]] | ||
[[Category: Kanamaru, S.]] | [[Category: Kanamaru, S.]] | ||
[[Category: Kostyuchenko, V | [[Category: Kostyuchenko, V A.]] | ||
[[Category: Leiman, P | [[Category: Leiman, P G.]] | ||
[[Category: Mesyanzhinov, V | [[Category: Mesyanzhinov, V V.]] | ||
[[Category: Rossmann, M | [[Category: Rossmann, M G.]] | ||
[[Category: K]] | [[Category: K]] | ||
[[Category: PO4]] | [[Category: PO4]] | ||
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[[Category: triple-stranded beta-helix]] | [[Category: triple-stranded beta-helix]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:29:16 2008'' | ||
Revision as of 14:29, 21 February 2008
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The Structure of the Bacteriophage T4 Cell-Puncturing Device
OverviewOverview
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 StructureAbout this Structure
1K28 is a Protein complex structure of sequences from Bacteriophage t4 with and as ligands. Active as Lysozyme, with EC number 3.2.1.17 Full crystallographic information is available from OCA.
ReferenceReference
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
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