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Structure and Genome Release Mechanism of the Human Cardiovirus Saffold Virus 3

DOI: 10.1128/JVI.00746-16 DOI Help

Authors: Edukondalu Mullapudi , Jiří Nováček , Lenka Pálková , Pavel Kulich , A. Michael Lindberg , Frank J. M. Van Kuppeveld , Pavel Plevka (Central European Institute of Technology, Masaryk University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Virology , VOL 90 , PAGES 7628 - 7639

State: Published (Approved)
Published: August 2016

Open Access Open Access

Abstract: In order to initiate an infection, viruses need to deliver their genomes into cells. This involves uncoating the genome and transporting it to the cytoplasm. The process of genome delivery is not well understood for nonenveloped viruses. We address this gap in our current knowledge by studying the uncoating of the nonenveloped human cardiovirus Saffold virus 3 (SAFV-3) of the family Picornaviridae. SAFVs cause diseases ranging from gastrointestinal disorders to meningitis. We present a structure of a native SAFV-3 virion determined to 2.5 Å by X-ray crystallography and an 11-Å-resolution cryo-electron microscopy reconstruction of an “altered” particle that is primed for genome release. The altered particles are expanded relative to the native virus and contain pores in the capsid that might serve as channels for the release of VP4 subunits, N termini of VP1, and the RNA genome. Unlike in the related enteroviruses, pores in SAFV-3 are located roughly between the icosahedral 3- and 5-fold axes at an interface formed by two VP1 and one VP3 subunit. Furthermore, in native conditions many cardioviruses contain a disulfide bond formed by cysteines that are separated by just one residue. The disulfide bond is located in a surface loop of VP3. We determined the structure of the SAFV-3 virion in which the disulfide bonds are reduced. Disruption of the bond had minimal effect on the structure of the loop, but it increased the stability and decreased the infectivity of the virus. Therefore, compounds specifically disrupting or binding to the disulfide bond might limit SAFV infection.

Subject Areas: Biology and Bio-materials, Medicine

Instruments: I03-Macromolecular Crystallography

Added On: 09/11/2016 14:42


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