1V0E

Endosialidase of Bacteriophage K1F

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1v0eb1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
B	d1v0eb2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
C	d1v0ec1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
C	d1v0ec2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
A	d1v0ea1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
A	d1v0ea2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
D	d1v0ed1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
D	d1v0ed2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
E	d1v0ee1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
E	d1v0ee2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
F	d1v0ef1	All beta proteins	6-bladed beta-propeller	Sialidases	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)
F	d1v0ef2	All beta proteins	Triple-stranded beta-helix	Phage fibre proteins	Endo-alpha-sialidase	Endo-alpha-sialidase	(Escherichia phage K1F ) [TaxId: 344021 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Phage fibre proteins	8042944	3000351	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Phage fibre proteins	8042944	3000351	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
A	SCOP2 Family	Endo-alpha-sialidase	8030563	4003214	SCOP2 (2022-06-29)
A	SCOP2 Family	Endo-alpha-sialidase	8030565	4003250	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Sialidases	8042942	3001607	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Phage fibre proteins	8042944	3000351	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2 (2022-06-29)
D	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Phage fibre proteins	8042944	3000351	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Phage fibre proteins	8042944	3000351	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Phage fibre proteins	8042944	3000351	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Bacteriophage endosialidase N-terminal domain-like	8052101	3002093	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Sialidases	8042942	3001607	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Bacteriophage endosialidase insert barrel domain-like	8052100	3002092	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)
B	End_beta_barrel	e1v0eB3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
B	End_N_terminal	e1v0eB1	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
B	End_beta_propel	e1v0eB4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
B	End_tail_spike	e1v0eB2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)
C	End_beta_barrel	e1v0eC3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
C	End_N_terminal	e1v0eC1	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
C	End_beta_propel	e1v0eC4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
C	End_tail_spike	e1v0eC2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)
A	End_beta_barrel	e1v0eA3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
A	End_N_terminal	e1v0eA5	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
A	End_beta_propel	e1v0eA4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
A	End_tail_spike	e1v0eA2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)
D	End_beta_barrel	e1v0eD3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
D	End_N_terminal	e1v0eD1	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
D	End_beta_propel	e1v0eD4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
D	End_tail_spike	e1v0eD2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)
E	End_beta_barrel	e1v0eE3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
E	End_N_terminal	e1v0eE1	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
E	End_beta_propel	e1v0eE4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
E	End_tail_spike	e1v0eE2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)
F	End_beta_barrel	e1v0eF3	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: Alanine racemase-C	F: End_beta_barrel	ECOD (1.6)
F	End_N_terminal	e1v0eF1	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Pectin lyase-like (From Topology)	T: Pectin lyase-like	F: End_N_terminal	ECOD (1.6)
F	End_beta_propel	e1v0eF4	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: End_beta_propel	ECOD (1.6)
F	End_tail_spike	e1v0eF2	A: beta duplicates or obligate multimers	X: Phage tail fiber protein trimerization domain (From Topology)	H: Phage tail fiber protein trimerization domain (From Topology)	T: Phage tail fiber protein trimerization domain	F: End_tail_spike	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
B	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
B	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
B	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)
C	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
C	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
C	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
C	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)
A	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
A	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
A	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
A	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)
D	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
D	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
D	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
D	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)
E	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
E	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
E	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
E	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)
F	3.30.750.60	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA	Endosialidase, N-terminal extension domain	CATH (4.3.0)
F	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
F	2.40.30.20	Mainly Beta	Beta Barrel	Elongation Factor Tu (Ef-tu)	domain 3	CATH (4.3.0)
F	4.10.1090.10	Few Secondary Structures	Irregular	Endosialidase, domain 4	Endosialidase, domain 4	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F	PF12195	Beta barrel domain of bacteriophage endosialidase (End_beta_barrel)	Beta barrel domain of bacteriophage endosialidase	-	Repeat
A, B, C, D, E A, B, C, D, E, F	PF12219	Catalytic domain of bacteriophage endosialidase (End_tail_spike)	Catalytic domain of bacteriophage endosialidase	-	Repeat
A, B, C, D, E A, B, C, D, E, F	PF12218	N terminal extension of bacteriophage endosialidase (End_N_terminal)	N terminal extension of bacteriophage endosialidase	-	Repeat
A, B, C, D, E A, B, C, D, E, F	PF12217	Catalytic beta propeller domain of bacteriophage endosialidase (End_beta_propel)	Catalytic beta propeller domain of bacteriophage endosialidase	-	Repeat

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	ENDO-ALPHA-SIALIDASE	hydrolase activity, acting on glycosyl bonds endo-alpha-(2,8)-sialidase activity alpha-sialidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity identical protein binding protein binding binding	virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral process viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction metabolic process symbiont entry into host symbiont-mediated disruption of host anatomical structure symbiont-mediated disruption of host cell envelope symbiont entry into host cell via disruption of host cell envelope symbiont-mediated disruption of host cellular anatomical entity virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral process viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction metabolic process symbiont entry into host symbiont-mediated disruption of host anatomical structure symbiont-mediated disruption of host cell envelope symbiont entry into host cell via disruption of host cell envelope symbiont-mediated disruption of host cellular anatomical entity symbiont entry into host cell disruption of anatomical structure in another organism receptor-mediated virion attachment to host cell adhesion receptor-mediated virion attachment to host cell symbiont entry into host cell via disruption of host cell glycocalyx	virus tail, fiber virus tail virion component

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F	IPR024427	Endosialidase, beta barrel domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR024428	Endosialidase, beta propeller domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR036278	Sialidase superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR023366	ATP synthase subunit alpha, N-terminal domain-like superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR024430	Endosialidase, C-terminal domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR024429	Endosialidase, N-terminal extension domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR040775	Tail spike TSP1/Gp66, N-terminal domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR044914	Endosialidase, C-terminal domain superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR005604	Bacteriophage T7 tail fibre protein-like, N-terminal domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR001724	Glycosyl hydrolase 58	Family
A, B, C, D, E A, B, C, D, E, F	IPR030392	Intramolecular chaperone auto-processing domain	Domain

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	endo-alpha-sialidase M-CSA #829	E. coli K1, a major cause of neonatal sepsis and meningitis, surrounds itself in a capsule of poly alpha2,8-sialic acid (polySia), a sugar polymer that also acts as an important modulator of neuronal plasticity in the adult human host; hence, the mammalian immune system does not attack the bacterium. The bacteriophage K1F can hydrolyse this bacterial capsule using an endosialidase, which is a mushroom-shaped homotrimer. This enzyme may find use in the diagnosis or therapy of polySia-bearing tumours, and in the treatment of meningitis caused by polySia-encapsulated bacteria.	Defined by 5 residues: TYR:A-81 [auth A-325]HIS:A-106 [auth A-350]GLU:A-337 [auth A-581]ARG:A-352 [auth A-596]ARG:A-403 [auth A-647] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.2.1.129 (PDB Primary Data) Search M-CSA Motif + EC 3.2.1.129