Major capsid protein

UniProtKB accession:  Q6QGD8

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UniProtKB description:  Major capsid protein that self-associates to form 120 hexamers and 11 pentamers, building the T=13 icosahedral capsid which about 860 Angstroms in diameter. Responsible for its self-assembly into a procapsid. The phage does not need to encode a separate scaffolfing protein because its capsid protein contains the delta domain that carries that function. The capsid gains its final stability through the reorganization of the subunits that takes place upon expansion. DNA encapsidation through the portal triggers capsid expansion and the binding of the decoration protein to the capsid exterior. Might play a role in counteracting the host Pycsar defense system that is mediated by pyrimidine cyclases and leads to abortive infection.