This protein family includes Major coat protein from Salmonella phage epsilon15 (Gp10) and similar sequences from tailed bacteriophages and from bacterial prophages. Gp10 binds to the outer surface of the virus capsid. It adopts a jellyroll viral protein fold with two sheets consisting of four beta-strands each [1].

1: Validated near-atomic resolution structure of bacteriophage epsilon15 derived from cryo-EM and modeling. Baker ML, Hryc CF, Zhang Q, Wu W, Jakana J, Haase-Pettingell C, Afonine PV, Adams PD, King JA, Jiang W, Chiu W; Proc Natl Acad Sci U S A. 2013;110:12301-12306. PMID:23840063