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TitleCapsomer dynamics and stabilization in the T = 12 marine bacteriophage SIO-2 and its procapsid studied by CryoEM.
Journal, issue, pagesStructure, Vol. 20, Issue 3, Page 498-503, Year 2012
Publish dateMar 7, 2012
AuthorsGabriel C Lander / Anne-Claire Baudoux / Farooq Azam / Clinton S Potter / Bridget Carragher / John E Johnson /
PubMed AbstractWe 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 ...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.
External linksStructure / PubMed:22405008 / PubMed Central
MethodsEM (single particle)
Resolution8.5 - 15.0 Å
Structure data

EMDB-5382:
Marine Bacteriophage SIO-2 with T12 symmetry (Mature Capsid)
Method: EM (single particle) / Resolution: 8.5 Å

EMDB-5383:
Marine Bacteriophage SIO-2 with T12 symmetry (Procapsid)
Method: EM (single particle) / Resolution: 15.0 Å

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