This model represents one of several distantly related families of phage portal protein. This protein forms a hole, or portal, that enables DNA passage during packaging and ejection. It also forms the junction between the phage head (capsid) and the tail proteins. It functions as a dodecamer of a single polypeptide of average mol. wt. of 40-90 KDa. This family shows clear homology to TIGR01537. The alignment for this group was trimmed of poorly alignable N-terminal sequence of about 50 residues and of C-terminal regions present in some but not all members of up 180 residues. [Mobile and extrachromosomal element functions, Prophage functions]
Jiyao W et al.(2023). "The conserved domain database in 2023.",