1yc6
From Proteopedia
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| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1yc6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yc6 OCA], [http://www.ebi.ac.uk/pdbsum/1yc6 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1yc6 RCSB]</span> | ||
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Revision as of 22:02, 30 March 2008
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| , resolution 2.90Å | |||||||
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| Related: | ijs9
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystallographic Structure of the T=1 Particle of Brome Mosaic Virus
Overview
T=1 icosahedral particles of amino terminally truncated brome mosaic virus (BMV) protein were created by treatment of the wild-type T=3 virus with 1M CaCl2 and crystallized from sodium malonate. Diffraction data were collected from frozen crystals to beyond 2.9 A resolution and the structure determined by molecular replacement and phase extension. The particles are composed of pentameric capsomeres from the wild-type virions which have reoriented with respect to the original particle pentameric axes by rotations of 37 degrees , and formed tenuous interactions with one another, principally through conformationally altered C-terminal polypeptides. Otherwise, the pentamers are virtually superimposable upon those of the original T=3 BMV particles. The T=1 particles, in the crystals, are not perfect icosahedra, but deviate slightly from exact symmetry, possibly due to packing interactions. This suggests that the T=1 particles are deformable, which is consistent with the loose arrangement of pentamers and latticework of holes that penetrate the surface. Atomic force microscopy showed that the T=3 to T=1 transition could occur by shedding of hexameric capsomeres and restructuring of remaining pentamers accompanied by direct condensation. Knowledge of the structures of the BMV wild-type and T=1 particles now permit us to propose a tentative model for that process. A comparison of the BMV T=1 particles was made with the reassembled T=1 particles produced from the coat protein of trypsin treated alfalfa mosaic virus (AlMV), another bromovirus. There is little resemblance between the two particles. The BMV particle, with a maximum diameter of 195 A, is made from distinctive pentameric capsomeres with large holes along the 3-fold axis, while the AlMV particle, of approximate maximum diameter 220 A, has subunits closely packed around the 3-fold axis, large holes along the 5-fold axis, and few contacts within pentamers. In both particles crucial linkages are made about icosahedral dyads.
About this Structure
1YC6 is a Single protein structure of sequence from Brome mosaic virus. Full crystallographic information is available from OCA.
Reference
Crystallographic structure of the T=1 particle of brome mosaic virus., Larson SB, Lucas RW, McPherson A, J Mol Biol. 2005 Feb 25;346(3):815-31. Epub 2005 Jan 12. PMID:15713465
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