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
- 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.,Sect.D 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.