Annotations: 4KSS

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
F	SCOP2 Family	Hcp1-like	8101210	4001941	SCOP2 (2022-06-29)
F	SCOP2 Superfamily	T6SS-like	8101211	3000580	SCOP2 (2022-06-29)
F	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	T6SS-like	8101211	3000580	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	T6SS-like	8101211	3000580	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	T6SS-like	8101211	3000580	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	T6SS-like	8101211	3000580	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	T6SS-like	8101211	3000580	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	RecA-like P-loop NTPases	8056593	3002019	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	T2SE N-terminal domain-like	8056592	3002353	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F	T6SS_HCP	e4kssF1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
F	T2SSE	e4kssF2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)
E	T6SS_HCP	e4kssE1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
E	T2SSE	e4kssE2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)
D	T6SS_HCP	e4kssD1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
D	T2SSE	e4kssD2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)
C	T6SS_HCP	e4kssC1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
C	T2SSE	e4kssC2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)
B	T6SS_HCP	e4kssB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
B	T2SSE	e4kssB2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)
A	T6SS_HCP	e4kssA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: T6SS_HCP	ECOD (1.6)
A	T2SSE	e4kssA2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: T2SSE	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F	PF00437	Type II/IV secretion system protein (T2SSE)	Type II/IV secretion system protein	This entry contains both Type II protein secretion system (T2SS), including Type 4 pilus (T4P), and Type IV protein secretion system (T4SS) from Gram-negative bacteria. Swiss:P07169 VirB11 ATPase is a subunit of the Agrobacterium tumefaciens transfer ...	This entry contains both Type II protein secretion system (T2SS), including Type 4 pilus (T4P), and Type IV protein secretion system (T4SS) from Gram-negative bacteria. Swiss:P07169 VirB11 ATPase is a subunit of the Agrobacterium tumefaciens transfer DNA (T-DNA) transfer system, a type IV secretion pathway required for delivery of T-DNA and effector proteins to plant cells during infection [1]. The cytoplasmic T2S E ATPase is a Zn-containing protein thought to provide the mechanical force for the secretion process. T2S-E contains Walker A and B motifs, that are essential for secretion and ATPase activity. ATPase PulE and XcpR from Klebsiella oxytoca and Pseudomonas aeruginosa respectively are required for protein secretion via the T2SS. ATPase PilB is required for T4P extension [2]. The type II protein secretion system (T2SS) is a sophisticated multi-protein machinery containing 12-15 different proteins [3]. Historically, this system was described as the main terminal branch (MTB) of the general secretory pathway (GSP), but this nomenclature is now on obsolete [4].	Domain
A, B, C, D, E A, B, C, D, E, F	PF05638	Type VI secretion system effector, Hcp (T6SS_HCP)	Type VI secretion system effector, Hcp	HCP is a family of proteins which are expressed in up to 1000 copies in Gram-negative bacteria. Together these copies aggregate into a needle-like shaft or tube that will penetrate other bacteria via a puncturing protein attached to its head [1] bein ...	HCP is a family of proteins which are expressed in up to 1000 copies in Gram-negative bacteria. Together these copies aggregate into a needle-like shaft or tube that will penetrate other bacteria via a puncturing protein attached to its head [1] being part of the type VI secretion system [3,4]. Initially Hcp forms a hexameric structure with a central channel of 40 Angstroms. These hexamers pile up one on top of each other forming nanotubes resembling the gp19 tail phage tube [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F	Type II secretion system protein E, hemolysin-coregulated protein	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding protein transporter activity primary active transmembrane transporter activity ATPase-coupled transmembrane transporter activity protein transmembrane transporter activity protein-transporting ATPase activity protein-exporting ATPase activity ATP-dependent activity macromolecule transmembrane transporter activity active transmembrane transporter activity transporter activity transmembrane transporter activity pyrophosphatase activity ATP hydrolysis activity ribonucleoside triphosphate phosphatase activity hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides hydrolase activity hydrolase activity, acting on acid anhydrides catalytic activity cation binding metal ion binding	protein transport across the cell outer membrane establishment of protein localization nitrogen compound transport transport secretion establishment of protein localization to extracellular region export from cell protein secretion by the type II secretion system protein secretion establishment of localization protein localization to extracellular region transmembrane transport localization secretion by cell protein transmembrane transport protein transport across the cell outer membrane establishment of protein localization nitrogen compound transport transport secretion establishment of protein localization to extracellular region export from cell protein secretion by the type II secretion system protein secretion establishment of localization protein localization to extracellular region transmembrane transport localization secretion by cell protein transmembrane transport protein transport macromolecule localization cellular process intracellular protein localization	protein-containing complex type II protein secretion system complex cell periphery cellular anatomical structure plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F	IPR036624	Hcp1-like superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR053165	HSI-I assembly protein Hcp1	Family
A, B, C, D, E A, B, C, D, E, F	IPR008514	Type VI secretion system effector Hcp	Family
A, B, C, D, E A, B, C, D, E, F	IPR037257	Type II secretion system protein GspE, N-terminal superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR013369	Type II secretion system protein GspE	Family
A, B, C, D, E A, B, C, D, E, F	IPR054757	Type II secretion system protein E, N1E domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR001482	Type II/IV secretion system domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR003593	AAA+ ATPase domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR027417	P-loop containing nucleoside triphosphate hydrolase	Homologous Superfamily

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.