Structural rearrangements in the membrane penetration protein of a non-enveloped virus.Dormitzer, P.R., Nason, E.B., Prasad, B.V., Harrison, S.C.
(2004) Nature 430: 1053-1058
- PubMed: 15329727
- DOI: 10.1038/nature02836
- PubMed Abstract:
- The rhesus rotavirus VP4 sialic acid binding domain has a galectin fold with a novel carbohydrate binding site
Dormitzer, P.R.,Sun, Z.-Y.J.,Wagner, G.,Harrison, S.C.
(2002) Embo J. 21: 885
- A statistic for local intensity differences: robustness to anisotropy and pseudo-centering and utility for detecting twinning
Padilla, J.E.,Yeates, T.O.
(2003) Acta Crystallogr.,Sect.D 59: 1124
- Proteolysis of monomeric recombinant rotavirus VP4 yields an oligomeric VP5* core
Dormitzer, P.R.,Greenberg, H.B.,Harrison, S.C.
(2001) J.Virol. 75: 7339
Non-enveloped virus particles (those that lack a lipid-bilayer membrane) must breach the membrane of a target host cell to gain access to its cytoplasm. So far, the molecular mechanism of this membrane penetration step has resisted structural analysi ...
Non-enveloped virus particles (those that lack a lipid-bilayer membrane) must breach the membrane of a target host cell to gain access to its cytoplasm. So far, the molecular mechanism of this membrane penetration step has resisted structural analysis. The spike protein VP4 is a principal component in the entry apparatus of rotavirus, a non-enveloped virus that causes gastroenteritis and kills 440,000 children each year. Trypsin cleavage of VP4 primes the virus for entry by triggering a rearrangement that rigidifies the VP4 spikes. We have determined the crystal structure, at 3.2 A resolution, of the main part of VP4 that projects from the virion. The crystal structure reveals a coiled-coil stabilized trimer. Comparison of this structure with the two-fold clustered VP4 spikes in a approximately 12 A resolution image reconstruction from electron cryomicroscopy of trypsin-primed virions shows that VP4 also undergoes a second rearrangement, in which the oligomer reorganizes and each subunit folds back on itself, translocating a potential membrane-interaction peptide from one end of the spike to the other. This rearrangement resembles the conformational transitions of membrane fusion proteins of enveloped viruses.
Department of Pediatrics, Harvard Medical School, and the Laboratory of Molecular Medicine, Children's Hospital, Boston, Massachusetts 02115, USA. email@example.com