3iyl

Publication Abstract from PubMed

To achieve cell entry, many nonenveloped viruses must transform from a dormant to a primed state. In contrast to the membrane fusion mechanism of enveloped viruses (e.g., influenza virus), this membrane penetration mechanism is poorly understood. Here, using single-particle cryo-electron microscopy, we report a 3.3 A structure of the primed, infectious subvirion particle of aquareovirus. The density map reveals side-chain densities of all types of amino acids (except glycine), enabling construction of a full-atom model of the viral particle. Our structure and biochemical results show that priming involves autocleavage of the membrane penetration protein and suggest that Lys84 and Glu76 may facilitate this autocleavage in a nucleophilic attack. We observe a myristoyl group, covalently linked to the N terminus of the penetration protein and embedded in a hydrophobic pocket. These results suggest a well-orchestrated process of nonenveloped virus entry involving autocleavage of the penetration protein prior to exposure of its membrane-insertion finger.

3.3 A cryo-EM structure of a nonenveloped virus reveals a priming mechanism for cell entry.,Zhang X, Jin L, Fang Q, Hui WH, Zhou ZH Cell. 2010 Apr 30;141(3):472-82. Epub 2010 Apr 15. PMID:20398923^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.