Cowpea Chlorotic Mottle Virus
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The hexameric capsomeres are formed by the B and C subunits. The N-terminus arms (residue 27 through 49) of the subunits intertwine to form a ring structure. The N-terminus is therefore key to the hexamer composition. | The hexameric capsomeres are formed by the B and C subunits. The N-terminus arms (residue 27 through 49) of the subunits intertwine to form a ring structure. The N-terminus is therefore key to the hexamer composition. | ||
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<scene name='Cowpea_Chlorotic_Mottle_Virus/Residues_27-49/1'>N-terminus arms</scene> | <scene name='Cowpea_Chlorotic_Mottle_Virus/Residues_27-49/1'>N-terminus arms</scene> | ||
The atoms of residues 27-49 are colored blue for clarity. | The atoms of residues 27-49 are colored blue for clarity. | ||
| + | Each hexamer consists of six beta strands that run parallel to each other and result in a pore in the center of the hexamer. Residues 29-33 line this pore and cover the opening of the capsid by the interaction of their side chains with adjacent residues. For example, the "side chain oxygens of Gln29 residues hydrogen bond with the main chain nitrogens of adjacent Gln29 residues, making a circular ring of interactions." | ||
| - | + | In the <scene name='Cowpea_Chlorotic_Mottle_Virus/Interior_of_beta_barrel/1'>interior of beta barrel</scene>we can see these lining residues: glutamine 29 (in red), valine 31 (in orange), and valine 33 (in green). | |
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| - | In the <scene name='Cowpea_Chlorotic_Mottle_Virus/Interior_of_beta_barrel/1'> | + | |
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Pentamer capsomeres, on the other hand, are formed exclusively from the contribution of A subunit chains. | Pentamer capsomeres, on the other hand, are formed exclusively from the contribution of A subunit chains. | ||
Revision as of 06:23, 29 November 2011
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Self-Assembling Cowpea Chlorotic Mottle Virus Capsid: Nanoreactor and Scaffold for Molecular Synthesis
Introduction
General Capsid Structure
The viral capsid of CCMV is a complex of proteins stabilized by metal coordination between capsomeres and RNA binding on its internal surface. The viral genome encodes three capsid proteins that are chemically identical. These subunits, arbitrarily called A, B, and C, dimerize with each other and assemble into into hexamers and pentamers that comprise the viral capsomeres. The complete capsid structure takes the form of a truncated icosahedron (20 faces). It is described as a T=3 capsid, where the T value is an indicator of structural complexity. "A T-number or the triangulation number which determines the size of an icosahedron is defined as: T=h^2 + hk + k^2" -Fumio Arisaka, Tokyo Institute of Technology.
Capsomere Structure
The hexameric capsomeres are formed by the B and C subunits. The N-terminus arms (residue 27 through 49) of the subunits intertwine to form a ring structure. The N-terminus is therefore key to the hexamer composition.
The atoms of residues 27-49 are colored blue for clarity.
Each hexamer consists of six beta strands that run parallel to each other and result in a pore in the center of the hexamer. Residues 29-33 line this pore and cover the opening of the capsid by the interaction of their side chains with adjacent residues. For example, the "side chain oxygens of Gln29 residues hydrogen bond with the main chain nitrogens of adjacent Gln29 residues, making a circular ring of interactions."
In the we can see these lining residues: glutamine 29 (in red), valine 31 (in orange), and valine 33 (in green).
Pentamer capsomeres, on the other hand, are formed exclusively from the contribution of A subunit chains.
Hexamer formation predominates the structure. It serves as the nucleation point for capsid construction.
- All Structural Content Derived from Speir et al.
"STRUCTURES OF THE NATIVE AND SWOLLEN FORMS OF COWPEA CHLOROTIC MOTTLE VIRUS DETERMINED BY X-RAY CRYSTALLOGRAPHY AND CRYO-ELECTRON MICROSCOPY"
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Inna Blyakhman, Michal Harel, Alexander Berchansky, Joel L. Sussman
