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Single-Jelly roll fold, horizontal

The single jelly-roll fold is composed of eight β-strands arranged in two four-stranded sheets. This architecture forms the capsid shells with T=1, T=3, T=4, or T=7 symmetry.
The fold also occurs in non-capsid proteins, such as minor capsid proteins, polyhedrin (found in occlusion bodies), and in several viral glycoproteins, including influenza hemagglutinin (1RU7) and coronavirus spikes (6VYB).

Origin:

There appear to be four main structural groups, which might reflect four different cellular origins :

Topology

By convention, the β-strands are designated B through I, a nomenclature that traces back to the first jelly-roll structure solved-the Tomato bushy stunt virus capsid protein-which included an extra strand A positioned outside the conserved core. The fold comprises two ?-sheets formed by strands BIDG and CHEF, oriented so that strand B faces C, I faces H, and so on.

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