Capsomer dynamics and stabilization in the T = 12 marine bacteriophage SIO-2 and its procapsid studied by CryoEM

Abstract : We report the subnanometer cryo-electron microscopy (cryoEM) reconstruction of a marine siphovirus, the Vibrio phage SIO-2. This phage is lytic for related Vibrio species with significant ecological importance, including the broadly antagonistic bacterium Vibrio sp. SWAT3. The three-dimensional structure of the 800 Å SIO-2, icosahedrally averaged head of the tailed particle revealed a T = 12 quasi-symmetry not previously described in a bacteriophage. Two morphologically distinct types of auxiliary proteins were also identified; one species bound to the surface of hexamers, and the other bound to pentamers. The secondary structure, evident in the electron density, shows that the major capsid protein has the HK97-like fold. The three-dimensional structure of the procapsid form, also presented here, has no "decoration" proteins and reveals a capsomer organization due to the constraints of the T = 12 symmetry.
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Structure, Elsevier (Cell Press), 2012, 20 (3), pp.498-503. 〈10.1016/j.str.2012.01.007〉
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Soumis le : jeudi 21 juin 2012 - 10:38:33
Dernière modification le : jeudi 11 janvier 2018 - 06:22:24

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G.C Lander, Anne-Claire Baudoux, F. Hazam, S. Potter C, B. Carragher, et al.. Capsomer dynamics and stabilization in the T = 12 marine bacteriophage SIO-2 and its procapsid studied by CryoEM. Structure, Elsevier (Cell Press), 2012, 20 (3), pp.498-503. 〈10.1016/j.str.2012.01.007〉. 〈hal-00710584〉

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