Structural Framework for DNA Translocation Via the Viral Portal ProteinLebedev, A.A., Krause, M.H., Isidro, A.L., Vagin, A.A., Orlova, E.V., Turner, J., Dodson, E.J., Tavares, P., Antson, A.A.
(2007) EMBO J 26: 1984
- PubMed: 17363899
- DOI: 10.1038/sj.emboj.7601643
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization and Preliminary X-Ray Crystallographic Studies of the 13-Fold Symmetric Portal Protein of Bacteriophage Spp1
Jekow, P., Schaper, S., Gunther, D., Tavares, P., Hinrichs, W.
(1998) Acta Crystallogr D Biol Crystallogr 54: 1008
- Identification of a Gene in Bacillus Subtilis Bacteriophage Spp1 Determining the Amount of Packaged DNA
Tavares, P., Santos, M.A., Lurz, R., Morelli, G., Delencastre, H., Trautner, T.A.
(1992) J Mol Biol 225: 81
Tailed bacteriophages and herpesviruses load their capsids with DNA through a tunnel formed by the portal protein assembly. Here we describe the X-ray structure of the bacteriophage SPP1 portal protein in its isolated 13-subunit form and the pseudoat ...
Tailed bacteriophages and herpesviruses load their capsids with DNA through a tunnel formed by the portal protein assembly. Here we describe the X-ray structure of the bacteriophage SPP1 portal protein in its isolated 13-subunit form and the pseudoatomic structure of a 12-subunit assembly. The first defines the DNA-interacting segments (tunnel loops) that pack tightly against each other forming the most constricted part of the tunnel; the second shows that the functional dodecameric state must induce variability in the loop positions. Structural observations together with geometrical constraints dictate that in the portal-DNA complex, the loops form an undulating belt that fits and tightly embraces the helical DNA, suggesting that DNA translocation is accompanied by a 'mexican wave' of positional and conformational changes propagating sequentially along this belt.
York Structural Biology Laboratory, Department of Chemistry, University of York, York, UK.