Molecular rearrangements involved in the capsid shell maturation of bacteriophage T7.Ionel, A., Velazquez-Muriel, J.A., Luque, D., Cuervo, A., Caston, J.R., Valpuesta, J.M., Martin-Benito, J., Carrascosa, J.L.
(2011) J.Biol.Chem. 286: 234-242
- PubMed: 20962334
- DOI: 10.1074/jbc.M110.187211
- Primary Citation of Related Structures:  2XVR
- PubMed Abstract:
- Quasi-atomic model of bacteriophage t7 procapsid shell: insights into the structure and evolution of a basic fold.
Agirrezabala, X.,Velazquez-Muriel, J.A.,Gomez-Puertas, P.,Scheres, S.H.,Carazo, J.M.,Carrascosa, J.L.
(2007) Structure 15: 461
Maturation of dsDNA bacteriophages involves assembling the virus prohead from a limited set of structural components followed by rearrangements required for the stability that is necessary for infecting a host under challenging environmental conditio ...
Maturation of dsDNA bacteriophages involves assembling the virus prohead from a limited set of structural components followed by rearrangements required for the stability that is necessary for infecting a host under challenging environmental conditions. Here, we determine the mature capsid structure of T7 at 1 nm resolution by cryo-electron microscopy and compare it with the prohead to reveal the molecular basis of T7 shell maturation. The mature capsid presents an expanded and thinner shell, with a drastic rearrangement of the major protein monomers that increases in their interacting surfaces, in turn resulting in a new bonding lattice. The rearrangements include tilting, in-plane rotation, and radial expansion of the subunits, as well as a relative bending of the A- and P-domains of each subunit. The unique features of this shell transformation, which does not employ the accessory proteins, inserted domains, or molecular interactions observed in other phages, suggest a simple capsid assembling strategy that may have appeared early in the evolution of these viruses.
Department of Macromolecular Structure, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Darwin 3, Cantoblanco, 28049 Madrid, Spain.