Annotations: 6TOA

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
G	UNK_F_TYPE	e6toaG1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Phage tail proteins	F: UNK_F_TYPE	ECOD (1.6)
F [auth E]	Phage_H_T_join	e6toaE1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Phage tail proteins	F: Phage_H_T_join	ECOD (1.6)
E [auth F]	DUF3168	e6toaF1	A: a+b two layers	X: Alpha-beta plaits	H: Phage tail protein-like (From Topology)	T: Phage tail protein-like	F: DUF3168	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth E]	2.40.10.270	Mainly Beta	Beta Barrel	Thrombin, subunit H	Bacteriophage SPP1 head-tail adaptor protein	CATH (utative)
E [auth F]	3.30.2000.30	Alpha Beta	2-Layer Sandwich	STM4215-like		CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
G	PF06199	Phage tail tube protein (Phage_tail_2)	Phage tail tube protein	-	Family
F [auth E]	PF05521	Phage head completion protein (Phage_HCP)	Phage head completion protein	This entry represents the head completion protein (gp16) found in Siphoviridae bacteriophages. This protein functions as a stopper in the portal-tail connector complex, locking the viral DNA inside the capsid. During infection, it undergoes a conform ...	This entry represents the head completion protein (gp16) found in Siphoviridae bacteriophages. This protein functions as a stopper in the portal-tail connector complex, locking the viral DNA inside the capsid. During infection, it undergoes a conformational change, opening by a diaphragm-like motion to allow the genome to exit the capsid through the tail tube to the host cell. The protein also functions as a docking platform for the preassembled tail. The connector complex is essential for stable viral particle assembly and controlled genome release during host infection.	Domain
E [auth F]	PF11367	Tail completion protein gp17 (Tail_completion_gp17)	Tail completion protein gp17	This entry includes Tail completion protein gp17 from Siphoviridae bacteriophage SPP1 Swiss:O48448, a tail completion protein which caps the tail and interacts with the connector gp16, thereby attaching the tail to the capsid [1,2].	Domain
B [auth A], C [auth B]	PF04860	Phage portal protein (Phage_portal)	Phage portal protein	-	Family

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
G	IPR011855	Phage major tail protein TP901-1	Family
G	IPR022344	Gene transfer agent, major tail protein	Family
F [auth E]	IPR008767	Bacteriophage SPP1, head-tail adaptor	Family
F [auth E]	IPR038666	Bacteriophage SPP1, head-tail adaptor superfamily	Homologous Superfamily
E [auth F]	IPR053745	Viral Tail Completion Superfamily	Homologous Superfamily
E [auth F]	IPR021508	Tail completion protein gp17	Family
B [auth A], C [auth B]	IPR006427	Phage portal protein, HK97	Family
B [auth A], C [auth B]	IPR006944	Bacteriophage/Gene transfer agent portal protein	Family
A [auth C], D	IPR011738	Phage conserved hypothetical protein	Family

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.