1hh0
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FILAMENTOUS BACTERIOPHAGE PH75
OverviewOverview
The PH75 strain of filamentous bacteriophage (Inovirus) grows in the, thermophilic bacterium Thermus thermophilus at 70 degrees C. We have, characterized the viral DNA and determined the amino acid sequence of the, major coat protein, p8. The p8 protein is synthesized without a leader, sequence, like that of bacteriophage Pf3 but unlike that of bacteriophage, Pf1, both of which grow in the mesophile Pseudomonas aeruginosa. X-ray, diffraction patterns from ordered fibres of the PH75 virion are similar to, those from bacteriophages Pf1 and Pf3, indicating that the protein capsid, of the PH75 virion has the same helix symmetry and subunit shape, even, though the primary structures of the major coat proteins are quite, different and the virions assemble at very different temperatures. We have, used this information to build a molecular model of the PH75 protein, capsid based on that of Pf1, and refined the model by simulated annealing, using fibre diffraction data extending to 2.4 A resolution in the, meridional direction and to 3.1 A resolution in the equatorial direction., The common design may reflect a fundamental motif of alpha-helix packing, although differences exist in the DNA packaging and in the means of, insertion of the major coat protein of these filamentous bacteriophages, into the membrane of the host bacterial cell. These may reflect, differences in the assembly mechanisms of the virions.
About this StructureAbout this Structure
1HH0 is a Single protein structure of sequence from Vibrio phage f237. Full crystallographic information is available from OCA.
ReferenceReference
The protein capsid of filamentous bacteriophage PH75 from Thermus thermophilus., Pederson DM, Welsh LC, Marvin DA, Sampson M, Perham RN, Yu M, Slater MR, J Mol Biol. 2001 Jun 1;309(2):401-21. PMID:11371161
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