ジャーナル: J Virol / 年: 2011 タイトル: The cryo-electron microscopy structure of feline calicivirus bound to junctional adhesion molecule A at 9-angstrom resolution reveals receptor-induced flexibility and two distinct ...タイトル: The cryo-electron microscopy structure of feline calicivirus bound to junctional adhesion molecule A at 9-angstrom resolution reveals receptor-induced flexibility and two distinct conformational changes in the capsid protein VP1. 著者: David Bhella / Ian G Goodfellow / 要旨: Caliciviridae are small icosahedral positive-sense RNA-containing viruses and include the human noroviruses, a leading cause of infectious acute gastroenteritis and feline calicivirus (FCV), which ...Caliciviridae are small icosahedral positive-sense RNA-containing viruses and include the human noroviruses, a leading cause of infectious acute gastroenteritis and feline calicivirus (FCV), which causes respiratory illness and stomatitis in cats. FCV attachment and entry is mediated by feline junctional adhesion molecule A (fJAM-A), which binds to the outer face of the capsomere, inducing a conformational change in the capsid that may be important for viral uncoating. Here we present the results of our structural investigation of the virus-receptor interaction and ensuing conformational changes. Cryo-electron microscopy and three-dimensional image reconstruction were used to solve the structure of the virus decorated with a soluble fragment of the receptor at subnanometer resolution. In initial reconstructions, the P domains of the capsid protein VP1 and fJAM-A were poorly resolved. Sorting experiments led to improved reconstructions of the FCV-fJAM-A complex both before and after the induced conformational change, as well as in three transition states. These data showed that the P domain becomes flexible following fJAM-A binding, leading to a loss of icosahedral symmetry. Furthermore, two distinct conformational changes were seen; an anticlockwise rotation of up to 15° of the P domain was observed in the AB dimers, while tilting of the P domain away from the icosahedral 2-fold axis was seen in the CC dimers. A list of putative contact residues was calculated by fitting high-resolution coordinates for fJAM-A and VP1 to the reconstructed density maps, highlighting regions in both virus and receptor important for virus attachment and entry.
全体 : Feline Calicivirus decorated with junctional adhesion molecule A
全体
名称: Feline Calicivirus decorated with junctional adhesion molecule A
要素
試料: Feline Calicivirus decorated with junctional adhesion molecule A
ウイルス: Feline calicivirus (ウイルス)
タンパク質・ペプチド: Junctional Adhesion Molecule A
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超分子 #1000: Feline Calicivirus decorated with junctional adhesion molecule A
超分子
名称: Feline Calicivirus decorated with junctional adhesion molecule A タイプ: sample / ID: 1000 / 集合状態: T3 icosahedral capsid / Number unique components: 2
分子量
理論値: 16 MDa
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超分子 #1: Feline calicivirus
超分子
名称: Feline calicivirus / タイプ: virus / ID: 1 / Name.synonym: Feline calicivirus / NCBI-ID: 11978 / 生物種: Feline calicivirus / ウイルスタイプ: VIRION / ウイルス・単離状態: STRAIN / ウイルス・エンベロープ: No / ウイルス・中空状態: No / Syn species name: Feline calicivirus
宿主
生物種: Felis catus (イエネコ) / 別称: VERTEBRATES
分子量
理論値: 10.7 MDa
ウイルス殻
Shell ID: 1 / 名称: VP1 / 直径: 415 Å / T番号(三角分割数): 3
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分子 #1: Junctional Adhesion Molecule A
分子
名称: Junctional Adhesion Molecule A / タイプ: protein_or_peptide / ID: 1 / Name.synonym: fJAM-A 詳細: Virus was incubated in the presence of a soluble fragment of fJAM-A at 4oC for one hour コピー数: 180 / 集合状態: Monomer / 組換発現: Yes