*1.W.7. The (Bacillus* Phage SPP1) Portal Protein 7 (PPP7) Family** The Bacillus phage SSP1 protein forms the portal vertex of the capsid (Lebedev et al. 2007). 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. and binds to the terminase subunits to form the packaging machine. It is necessary to ensure correct procapsid size during capsid assembly. Once the capsid is packaged with the DNA, the terminase complex is substituted by the connector proteins gp15. DNA molecules of B. subtilis phage SPP1 exhibit terminal redundancy and are partially circularly permuted (Morelli et al. 1979).
This family belongs to the Phage Portal Protein (PPP) Superfamily.
References:
Lebedev, A.A., M.H. Krause, A.L. Isidro, A.A. Vagin, E.V. Orlova, J. Turner, E.J. Dodson, P. Tavares, and A.A. Antson. (2007). Structural framework for DNA translocation via the viral portal protein. EMBO. J. 26: 1984-1994.
Morelli, G., C. Fisseau, B. Behrens, T.A. Trautner, J. Luh, S.W. Ratcliff, D.P. Allison, and A.T. Ganesan. (1979). The genome of B. subtilis phage SSP1: the topology of DNA molecules. Mol. Gen. Genet. 168: 153-161.
Examples:
TC#	Name	Organismal Type	Example
1.W.7.1.1	Bacillus phage SPP1 portal protein of 503 aa		*PPP of Bacillus* phage SPP1**

1.W.7.1.2	Phage portal protein of 474 aas		PPP of Staphylococcus aureus

1.W.7.1.3	Phage portal protein of 515 aas		PPP of Weissella cibaria

1.W.7.1.4	Page portal protein of 523 aas		PPP of unclassified Lactonifactor

1.W.7.1.5	Phage portal protein of 441 aa		PPP of Domibacillus antri

Examples:
TC#	Name	Organismal Type	Example
1.W.7.2.1	Phage portal protein of 497 aas		PPP of Sphingobacterium deserti

1.W.7.2.2	Phage portal protein of 456 aas		PPP of Apibacter mensalis

1.W.7.2.3	Portal protein of 479 aas		PPP of Flavobacterium spartansii

1.W.7.2.4	Phage portal protein of 506 aas		*PPP of Odoribacter* sp.**

1.W.7.2.5	Phage portal protein of 523 aa		PPP of Dehalococcoides mccartyi

1.W.7.2.6	Portal protein of 470 aa		PP of Komagataeibacter xylinus

1.W.7.2.7	Uncharacterized protein of 535 aas		UP of Chloroflexi bacterium RBG_19FT_COMBO_48_23 (subsurface metagenome)

Examples:
TC#	Name	Organismal Type	Example
1.W.7.3.1	Phage portal protein of 473 aas		*PPP of Streptomyces* sp.**

1.W.7.3.2	Phage portal protein of 464 aa		PPP of Cellulomonas iranensis

1.W.7.3.3	Phage portal protein of 480 aa		PPP of Bifidobacterium animalis

1.W.7.3.4	Phage portal protein of 501 aa		PPP of Sporosarcina koreensis

1.W.7.3.5	Phage portal protein of 445 aa		*PPP of Cutibacterium* sp.**

1.W.7.3.6	Phage portal protein of 465 aa		*PPP of Microbacterium* phage Teagan**

1.W.7.3.7	Phage portal protein of 486 aas		*PPP of Mycobacterium* phage L5 (Mycobacteriophage L5)**

Examples:
TC#	Name	Organismal Type	Example
1.W.7.4.1	Putative portal protein of 435 aas		*PPP of Sulfitobacter* sp. HI0129**

1.W.7.4.2	Uncharacterized protein of 558 aas		*UP of Yangia* sp. CCB-MM3**

1.W.7.4.3	Site-specific integrase of 576 aa		Recombinase of Roseovarius aestuariivivens

Examples:
TC#	Name	Organismal Type	Example
1.W.7.5.1	Uncharacterized protein of 460 aas		UP of Chromobacterium haemolyticum

1.W.7.5.2	Uncharacterized protein of 485 aas		UP of Calditrichaeota bacterium (freshwater sediment metagenome)

1.W.7.5.3	Uncharacterized protein of 474 aas		UP of Candidatus Pacearchaeota archaeon (groundwater metagenome)

Examples:
TC#	Name	Organismal Type	Example
Examples:
TC#	Name	Organismal Type	Example
1.W.7.7.1	Uncharacterized protein of 470 aas		UP of Acidaminococcus fermentans

1.W.7.7.2	DUF4055 domain-containing protein [ of 465 aa		DUF4055 protein of Glaesserella parasuis

1.W.7.7.3	DUF4055 domain-containing protein of 492 aa		DUF4055 protein of Polyangium spumosum

1.W.7.7.4	Uncharacterized protein of 537 aas		*UP of Planctomyces* sp. SH-PL62**

1.W.7.7.5	Uncharacterized protein of 503 aas		*UP of Cyanobium* sp.**

1.W.7.7.6	DUF4055 domain-containing protein of 479 aa		DUF4055 protein of Ensifer sojae

Examples:
TC#	Name	Organismal Type	Example
1.W.7.8.1	Uncharacterized protein of 584 aas		UP of Candidatus Pacearchaeota archaeon (marine metagenome)

1.W.7.8.2	Uncharacterized protein of 591 aas		UP of Candidatus Pacearchaeota archaeon (marine metagenome)

1.W.7.8.3	DUF1073 domain-containing protein of 560 aa		DUF1073 protein of Xenorhabdus bovienii

1.W.7.8.4	Phage portal protein of 602 aa		PPP of Listeria monocytogenes