ジャーナル: Structure / 年: 2013 タイトル: Subunit folds and maturation pathway of a dsRNA virus capsid. 著者: Daniel Nemecek / Evzen Boura / Weimin Wu / Naiqian Cheng / Pavel Plevka / Jian Qiao / Leonard Mindich / J Bernard Heymann / James H Hurley / Alasdair C Steven / 要旨: The cystovirus ϕ6 shares several distinct features with other double-stranded RNA (dsRNA) viruses, including the human pathogen, rotavirus: segmented genomes, nonequivalent packing of 120 subunits ...The cystovirus ϕ6 shares several distinct features with other double-stranded RNA (dsRNA) viruses, including the human pathogen, rotavirus: segmented genomes, nonequivalent packing of 120 subunits in its icosahedral capsid, and capsids as compartments for transcription and replication. ϕ6 assembles as a dodecahedral procapsid that undergoes major conformational changes as it matures into the spherical capsid. We determined the crystal structure of the capsid protein, P1, revealing a flattened trapezoid subunit with an α-helical fold. We also solved the procapsid with cryo-electron microscopy to comparable resolution. Fitting the crystal structure into the procapsid disclosed substantial conformational differences between the two P1 conformers. Maturation via two intermediate states involves remodeling on a similar scale, besides huge rigid-body rotations. The capsid structure and its stepwise maturation that is coupled to sequential packaging of three RNA segments sets the cystoviruses apart from other dsRNA viruses as a dynamic molecular machine.
履歴
登録
2013年6月17日
登録サイト: PDBE / 処理サイト: PDBE
改定 1.0
2013年8月14日
Provider: repository / タイプ: Initial release
改定 1.1
2013年8月28日
Group: Database references
改定 1.2
2017年8月23日
Group: Data collection / カテゴリ: em_software Item: _em_software.fitting_id / _em_software.image_processing_id