ジャーナル: EMBO J / 年: 2011 タイトル: Atomic model of an infectious rotavirus particle. 著者: Ethan C Settembre / James Z Chen / Philip R Dormitzer / Nikolaus Grigorieff / Stephen C Harrison / 要旨: Non-enveloped viruses of different types have evolved distinct mechanisms for penetrating a cellular membrane during infection. Rotavirus penetration appears to occur by a process resembling ...Non-enveloped viruses of different types have evolved distinct mechanisms for penetrating a cellular membrane during infection. Rotavirus penetration appears to occur by a process resembling enveloped-virus fusion: membrane distortion linked to conformational changes in a viral protein. Evidence for such a mechanism comes from crystallographic analyses of fragments of VP4, the rotavirus-penetration protein, and infectivity analyses of structure-based VP4 mutants. We describe here the structure of an infectious rotavirus particle determined by electron cryomicroscopy (cryoEM) and single-particle analysis at about 4.3 Å resolution. The cryoEM image reconstruction permits a nearly complete trace of the VP4 polypeptide chain, including the positions of most side chains. It shows how the two subfragments of VP4 (VP8(*) and VP5(*)) retain their association after proteolytic cleavage, reveals multiple structural roles for the β-barrel domain of VP5(*), and specifies interactions of VP4 with other capsid proteins. The virion model allows us to integrate structural and functional information into a coherent mechanism for rotavirus entry.
AA: Core scaffold protein AB: Core scaffold protein AC: Intermediate capsid protein VP6 AD: Intermediate capsid protein VP6 AE: Intermediate capsid protein VP6 AF: Intermediate capsid protein VP6 AG: Intermediate capsid protein VP6 AH: Intermediate capsid protein VP6 AI: Intermediate capsid protein VP6 AJ: Intermediate capsid protein VP6 AK: Intermediate capsid protein VP6 AL: Intermediate capsid protein VP6 AM: Intermediate capsid protein VP6 AN: Intermediate capsid protein VP6 AO: Intermediate capsid protein VP6 BA: Outer layer protein VP7 BF: Outer layer protein VP7 BG: Outer layer protein VP7 BH: Outer layer protein VP7 BI: Outer layer protein VP7 BJ: Outer layer protein VP7 BK: Outer layer protein VP7 BL: Outer layer protein VP7 BM: Outer layer protein VP7 BN: Outer layer protein VP7 BO: Outer layer protein VP7 BP: Outer layer protein VP7 BQ: Outer layer protein VP7 BX: Outer capsid protein VP4 BY: Outer capsid protein VP4 BZ: Outer capsid protein VP4 ヘテロ分子
AA: Core scaffold protein AB: Core scaffold protein AC: Intermediate capsid protein VP6 AD: Intermediate capsid protein VP6 AE: Intermediate capsid protein VP6 AF: Intermediate capsid protein VP6 AG: Intermediate capsid protein VP6 AH: Intermediate capsid protein VP6 AI: Intermediate capsid protein VP6 AJ: Intermediate capsid protein VP6 AK: Intermediate capsid protein VP6 AL: Intermediate capsid protein VP6 AM: Intermediate capsid protein VP6 AN: Intermediate capsid protein VP6 AO: Intermediate capsid protein VP6 BA: Outer layer protein VP7 BF: Outer layer protein VP7 BG: Outer layer protein VP7 BH: Outer layer protein VP7 BI: Outer layer protein VP7 BJ: Outer layer protein VP7 BK: Outer layer protein VP7 BL: Outer layer protein VP7 BM: Outer layer protein VP7 BN: Outer layer protein VP7 BO: Outer layer protein VP7 BP: Outer layer protein VP7 BQ: Outer layer protein VP7 BX: Outer capsid protein VP4 BY: Outer capsid protein VP4 BZ: Outer capsid protein VP4 ヘテロ分子