Annotations: 2V6E

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Protelomerase-like	8045986	4004801	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	DNA breaking-rejoining enzymes	8053953	3001127	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	DNA breaking-rejoining enzymes	8053953	3001127	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)
A	Telomere_res_3rd	e2v6eA4	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Telomere_res_3rd	ECOD (1.6)
A	Telomere_res_2nd	e2v6eA3	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Telomere_res_2nd	ECOD (1.6)
A	EUF07958	e2v6eA1	A: alpha arrays	X: lambda integrase-N-like	H: lambda integrase-N (From Topology)	T: lambda integrase-N	F: EUF07958	ECOD (1.6)
A	CitB_like	e2v6eA5	A: alpha arrays	X: Protelomerase stirrup domain (From Topology)	H: Protelomerase stirrup domain (From Topology)	T: Protelomerase stirrup domain	F: CitB_like	ECOD (1.6)
A	EUF07986	e2v6eA2	A: alpha arrays	X: Protelomerase muzzle domain (From Topology)	H: Protelomerase muzzle domain (From Topology)	T: Protelomerase muzzle domain	F: EUF07986	ECOD (1.6)
B	Telomere_res_3rd	e2v6eB2	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Telomere_res_3rd	ECOD (1.6)
B	Telomere_res_2nd	e2v6eB1	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Telomere_res_2nd	ECOD (1.6)
B	EUF07958	e2v6eB3	A: alpha arrays	X: lambda integrase-N-like	H: lambda integrase-N (From Topology)	T: lambda integrase-N	F: EUF07958	ECOD (1.6)
B	CitB_like	e2v6eB4	A: alpha arrays	X: Protelomerase stirrup domain (From Topology)	H: Protelomerase stirrup domain (From Topology)	T: Protelomerase stirrup domain	F: CitB_like	ECOD (1.6)
B	EUF07986	e2v6eB5	A: alpha arrays	X: Protelomerase muzzle domain (From Topology)	H: Protelomerase muzzle domain (From Topology)	T: Protelomerase muzzle domain	F: EUF07986	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.287.3180	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
A	1.20.1440.270	Mainly Alpha	Up-down Bundle	de novo design (two linked rop proteins)		CATH (4.3.0)
A	1.10.443.30	Mainly Alpha	Orthogonal Bundle	hpI Integrase	Chain A	CATH (4.3.0)
A	1.10.10.2040	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)
B	1.10.287.3180	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
B	1.20.1440.270	Mainly Alpha	Up-down Bundle	de novo design (two linked rop proteins)		CATH (4.3.0)
B	1.10.443.30	Mainly Alpha	Orthogonal Bundle	hpI Integrase	Chain A	CATH (4.3.0)
B	1.10.10.2040	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF20849	Protelomerase, muzzle domain (TelK_muzzle)	Protelomerase, muzzle domain	This domain is found in Protelomerase from Klebsiella phage phiKO2 (TelK) and similar proteins from tailed bacteriophages and bacterial prophages mainly from Gammaproteobacteria. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activi ...	This domain is found in Protelomerase from Klebsiella phage phiKO2 (TelK) and similar proteins from tailed bacteriophages and bacterial prophages mainly from Gammaproteobacteria. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activity that resolves the catenated circular dimer produced from the bidirectional replication of a chromosome. The core of the TelK monomer consists of an N-terminal domain and a catalytic domain connected by a long alpha- helical linker. However, there are two extensions of the protein: a C-terminal DNA binding domain named the stirrup (Pfam:PF20818) and an N-terminal domain. The latter has an insertion termed the muzzle (this entry), which folds into two long alpha-helices. This protruding element is packed against the DNA-binding catalytic and N-terminal domains of the opposite subunit in each dimer [1].	Domain
A, B	PF20818	Protelomerase, stirrup domain (TelK_stirrup)	Protelomerase, stirrup domain	This domain is found in Protelomerase from Klebsiella phage phiKO2 (TelK) and similar proteins from tailed bacteriophages and bacterial prophages mainly from Gammaproteobacteria. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activi ...	This domain is found in Protelomerase from Klebsiella phage phiKO2 (TelK) and similar proteins from tailed bacteriophages and bacterial prophages mainly from Gammaproteobacteria. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activity that resolves the catenated circular dimer produced from the bidirectional replication of a chromosome. The core of the TelK monomer consists of an N-terminal domain and a catalytic domain connected by a long alpha- helical linker. However, there are two extensions of the protein: a C-terminal DNA binding domain named the stirrup (this entry) and a N-terminal core binding domain. This domain, which shows alpha- helical and beta-hairpin segments, binds to DNA using the winged helix-turn-helix motif and contacts the DNA flanking the cleavage site, extending the DNA binding interface. It is essential for the orientation and extent of DNA bending and for the refolding of cleaved DNA strands into hairpins [1].	Domain
A, B	PF16684	Telomere resolvase ResT/TelK catalytic domain (ResT-TelK_cat)	Telomere resolvase ResT/TelK catalytic domain	Telomere resolvase (protelomerase) catalyses the conversion of linear double-stranded DNA into hairpin telomeres [1]. This entry represents the catalytic domain of ResT and TelK [1-3].	Domain
A, B	PF22853	Protelomerase TelK-like N-terminal domain (TelK_N)	Protelomerase TelK-like N-terminal domain	This entry represents the N-terminal domain of protelomerase TelK from Klebsiella phage phiKO2 and similar proteins from tailed bacteriophages and bacterial prophages. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activity that res ...	This entry represents the N-terminal domain of protelomerase TelK from Klebsiella phage phiKO2 and similar proteins from tailed bacteriophages and bacterial prophages. TelK is a hairpin telomere resolvase with DNA cleavage-rejoining activity that resolves the catenated circular dimer produced from the bidirectional replication of a chromosome. The core of the TelK monomer consists of an N-terminal domain and a catalytic domain connected by a long alpha- helical linker. However, there are two extensions of the protein: a C-terminal DNA binding domain named the stirrup (Pfam:PF20818) and an N-terminal domain containing an insertion, called the muzzle domain (Pfam:PF20849) [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PROTELEMORASE	DNA binding binding organic cyclic compound binding nucleic acid binding endonuclease activity nuclease activity hydrolase activity, acting on ester bonds hydrolase activity catalytic activity	nucleobase-containing compound metabolic process DNA replication metabolic process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular biosynthetic process cellular metabolic process viral DNA genome replication viral life cycle nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid biosynthetic process nucleobase-containing compound metabolic process DNA replication metabolic process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular biosynthetic process cellular metabolic process viral DNA genome replication viral life cycle nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid biosynthetic process biosynthetic process viral genome replication viral process cellular process DNA biosynthetic process	-
C, E	TELRL	-	-	-
D, F	TELRL	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR049460	Protelomerase TelK-like, muzzle domain	Domain
A, B	IPR038280	Telomere resolvase ResT/TelK, catalytic domain superfamily	Homologous Superfamily
A, B	IPR032047	Telomere resolvase ResT/TelK, catalytic domain	Domain
A, B	IPR049454	Protelomerase TelK-like, stirrup domain	Domain

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.