Genome Structure and Virion Structure

Genome Structure

• Its genome consist of a single molecule of linear, positive, single strand RNA and it not non-segmented.


• The complete genome is 7000-8500 nucleotides long.

Virion Structure of a Picornaviridae

• Picornavirus virions consist of a non-enveloped, icosahedrally symmetric capsid.


• The capsid consists of 12 capsomers and has a diameter of 27-30 nm,


• One of the smallest of all viruses.


• Genome is tightly packed into the capsid.


• The capsid has four unique proteins which are VP1, 2, 3, and 4.

Virion

Picture extracted: http://www.expasy.ch/viralzone/all_by_protein/33.html