Sulfolobus turreted icosahedral virus 1

Midway Geyser Basin of Yellowstone National Park.^[5]

triangulation number (T) of 31. At the 12 fivefold symmetrical positions of the icosahedron protrude 'turrets' that extend 13 nanometers (nm) above the capsid surface. The turrets have an average diameter of 24 nm. The center of each turret contains a ~3-nm channel. The function of this channel is not known but it may provide access between the interior and exterior of the virion. There appears to be a density at each end of the channel indicating that the channel may be blocked and suggesting a possible regulatory role associated with this density.^{[citation needed}

β-sheeted.^{[citation needed}

G+C content of 36%.^{[citation needed}