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We have determined the crystal structure of a bovine enterovirus, revealing that the topologies of the major capsid proteins and the overall architecture of the virion are similar to those of related picornaviruses. The external loops joining beta-strands are truncated and the canyon region is partially filled by an extension of the VP3 G-H loop giving the viral capsid a relatively smooth appearance. These changes may have implications for cell attachment. In spite of these differences the virus maintains a hydrophobic pocket within VP1, occupied by a specific 'pocket factor' which appears to be myristic acid. These observations support the proposal that a kinetic equilibrium exists between occupied and unoccupied pocket states, with occupation inhibiting uncoating.

Type

Journal article

Journal

Nat Struct Biol

Publication Date

03/1995

Volume

2

Pages

224 - 231

Keywords

Animals, Capsid, Capsid Proteins, Cattle, Crystallization, Enterovirus, Models, Molecular, Molecular Structure, Picornaviridae, Protein Conformation