1.W.5. The (Lambda) Phage Portal Protein 5 (PPP5) Family
The Escherichia phage lambda (Bacteriophage lambda) portal protein forms the portal vertex of the capsid (Kochan and Murialdo 1983). This portal plays critical roles in head assembly, genome packaging, neck/tail attachment, and genome ejection. The portal protein multimerizes as a single ring-shaped homododecamer arranged around a central channel (Kochan et al. 1984). It binds to the terminase subunits to form the packaging machine (Yeo and Feiss 1995).
The E. coli phage lambda portal protein (PPP) of 533 aas. See family description for the characteristics of this protein.
PPP of E. coli phage lambda
Phage portal protein of 552 aa
PPP of Pseudomonas fluorescens
Phage portal protein [ of 528 aas and possibly C-terminal TMSs.
PPP of Bradyrhizobium sp. RP6
Phage portal protein of 497 aa
PPP of Pseudomethylobacillus aquaticus
Phage portal protein of 502 aas
PPP of Clostridium symbiosum
Phage portal protein of 454 aas
PPP of Sulfitobacter guttiformis
Phage portal protein of 473 aas
PPP of Planctomycetes bacterium (freshwater metagenome)
Phage portal protein of 599 aas
PPP of Candidatus Pacearchaeota archaeon (marine metagenome)
Phage portal protein of 570 aas. This protein is homologous to protein in TC subclass 1.W.7.8.
PPP of Mailhella massiliensis