Download Mendeley3.88 A structure of cytoplasmic polyhedrosis virus by cryo-electron microscopy.
Yu, X., Jin, L., Zhou, Z.H.(2008) Nature 453: 415-419
- PubMed: 18449192
- DOI: https://doi.org/10.1038/nature06893
- Primary Citation of Related Structures:
3CNF - PubMed Abstract:
Cytoplasmic polyhedrosis virus (CPV) is unique within the Reoviridae family in having a turreted single-layer capsid contained within polyhedrin inclusion bodies, yet being fully capable of cell entry and endogenous RNA transcription. Biochemical data have shown that the amino-terminal 79 residues of the CPV turret protein (TP) is sufficient to bring CPV or engineered proteins into the polyhedrin matrix for micro-encapsulation. Here we report the three-dimensional structure of CPV at 3.88 A resolution using single-particle cryo-electron microscopy. Our map clearly shows the turns and deep grooves of alpha-helices, the strand separation in beta-sheets, and densities for loops and many bulky side chains; thus permitting atomic model-building effort from cryo-electron microscopy maps. We observed a helix-to-beta-hairpin conformational change between the two conformational states of the capsid shell protein in the region directly interacting with genomic RNA. We have also discovered a messenger RNA release hole coupled with the mRNA capping machinery unique to CPV. Furthermore, we have identified the polyhedrin-binding domain, a structure that has potential in nanobiotechnology applications.
Organizational Affiliation:
Department of Pathology and Laboratory Medicine, The University of Texas Medical School at Houston, Houston, Texas 77030, USA.
