2024-03-29T11:32:25Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1103552021-11-22T13:06:14Zcom_10261_25com_10261_1com_10261_41col_10261_278col_10261_294
00925njm 22002777a 4500
dc
Pickl-Herk, Angela
author
Luque, Daniel
author
Vives-Adrián, Laia
author
Querol-Audí, Jordi
author
Garriga, Damià
author
Trus, Benes L.
author
Verdaguer, Núria
author
Blaas, Dieter
author
Castón, José R.
author
2013-12-10
During infection, viruses undergo conformational changes that lead to delivery of their genome into host cytosol. In human rhinovirus A2, this conversion is triggered by exposure to acid pH in the endosome. The first subviral intermediate, the A-particle, is expanded and has lost the internal viral protein 4 (VP4), but retains its RNA genome. The nucleic acid is subsequently released, presumably through one of the large pores that open at the icosahedral twofold axes, and is transferred along a conduit in the endosomal membrane; the remaining empty capsids, termed B-particles, are shuttled to lysosomes for degradation. Previous structural analyses revealed important differences between the native protein shell and the empty capsid. Nonetheless, little is known of A-particle architecture or conformation of the RNA core. Using 3D cryo-electron microscopy and X-ray crystallography, we found notable changes in RNA-protein contacts during conversion of native virus into the A-particle uncoating intermediate. In the native virion, we confirmed interaction of nucleotide(s) with Trp38 of VP2 and identified additional contacts with the VP1 N terminus. Study of A-particle structure showed that the VP2 contact is maintained, that VP1 interactions are lost after exit of the VP1 N-terminal extension, and that the RNA also interacts with residues of the VP3 N terminus at the fivefold axis. These associations lead to formation of a well-ordered RNA layer beneath the protein shell, suggesting that these interactions guide ordered RNA egress.
Proceedings of the National Academy of Sciences of the United States of America 110(50): 20063-20068 (2013)
http://hdl.handle.net/10261/110355
10.1073/pnas.1312128110
24277846
Genome uncoating
Picornavirus
X-ray analysis
3D cryo-EM
Uncoating of common cold virus is preceded by RNA switching as determined by X-ray and cryo-EM analyses of the subviral A-particle