Cystoviridae

Diagram prepared for ICTVdB by Cornelia Büchen-Osmond

"Cystoviridae are enveloped spherical particles and are 86 nm in diameter. The nucleocapsid is about 58 nm in diameter. the removal of the nucleocapsid surface protein reveals a dodecahedral polymerase complex which is about 43 nm in diameter" (Virus Taxonomy, Sixth Report of the ICTV; 1995). The left hand diagram of Cystovirus is redrawn from the ICTV Report. The right hand 3D reconstruction of Pseudomonas phage f6 is from Dr Sarah J. Butcher at the Division of Virology at Glasgow, UK. "This figure shows a 2f surface view of the nucleocapsid of f6 where the major nucleocapsid protein is coloured white and the proteins of the polymerase complex are shown in orange". From: Butcher, S. J., Dokland, T. D., Ojala, P., Bamford, D. H., and Fuller, S. D. EMBO J. In press. Various assemblies of the enveloped, double stranded RNA virus phi6.

P1,P2,P4, and P7 consitute the polymerase complex.
P8 is the nucleocapsid surface protein.
P5 is a viral the lytic enzyme
P8 and P5 form the nucleocapsid together with the polymerase complex.
P9, P10, and P13 are residing in the envelope.
P3 and P6 are forming the absorption and fusion complex.
P3 is the spike recognition factor,
P6 is a membrane protein which is associating P3 with the virion.

Original WWW location of diagram.

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