Annotations: 1XO1

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1xo1b1	All alpha proteins	SAM domain-like	5' to 3' exonuclease, C-terminal subdomain	5' to 3' exonuclease, C-terminal subdomain	T5 5'-exonuclease	(Tequintavirus T5 ) [TaxId: 10726 ],	SCOPe (2.08)
B	d1xo1b2	Alpha and beta proteins (a/b)	PIN domain-like	PIN domain-like	5' to 3' exonuclease catalytic domain	T5 5'-exonuclease	(Tequintavirus T5 ) [TaxId: 10726 ],	SCOPe (2.08)
A	d1xo1a1	All alpha proteins	SAM domain-like	5' to 3' exonuclease, C-terminal subdomain	5' to 3' exonuclease, C-terminal subdomain	T5 5'-exonuclease	(Tequintavirus T5 ) [TaxId: 10726 ],	SCOPe (2.08)
A	d1xo1a2	Alpha and beta proteins (a/b)	PIN domain-like	PIN domain-like	5' to 3' exonuclease catalytic domain	T5 5'-exonuclease	(Tequintavirus T5 ) [TaxId: 10726 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	PIN domain-like	8044460	3001041	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	5' to 3' exonuclease, C-terminal subdomain	8037738	3000537	SCOP2B (2022-06-29)
A	SCOP2 Family	5' to 3' exonuclease, C-terminal subdomain	8025359	4001035	SCOP2 (2022-06-29)
A	SCOP2 Family	FEN1 catalytic domain-like	8032082	4000504	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	5' to 3' exonuclease, C-terminal subdomain	8037738	3000537	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	PIN domain-like	8044460	3001041	SCOP2 (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		e1xo1B1	A: HAD domain-like	X: HAD domain-related	H: HAD-like	T: APG6	F:	ECOD (20:10:01)
A		e1xo1A1	A: HhH/H2TH	X: SAM/DNA-glycosylase	H: SAM domain-like	T:	F:	ECOD (20:10:01)
A		e1xo1A2	A: Flavodoxin-like	X: HAD domain-related	H: PIN domain-like	T:	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.150.20	Mainly Alpha	Orthogonal Bundle	DNA polymerase	domain 1	CATH (4.3.0)
B	3.40.50.1010	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	5'-nuclease	CATH (4.3.0)
A	1.10.150.20	Mainly Alpha	Orthogonal Bundle	DNA polymerase	domain 1	CATH (4.3.0)
A	3.40.50.1010	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	5'-nuclease	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02739	5'-3' exonuclease, N-terminal resolvase-like domain (5_3_exonuc_N)	5'-3' exonuclease, N-terminal resolvase-like domain		Domain
A, B	PF01367	5'-3' exonuclease, C-terminal SAM fold (5_3_exonuc)	5'-3' exonuclease, C-terminal SAM fold		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	5'-EXONUCLEASE	DNA endonuclease activity endonuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on DNA nuclease activity catalytic activity, acting on a nucleic acid hydrolase activity double-stranded DNA endonuclease activity catalytic activity DNA nuclease activity DNA binding binding nucleic acid binding DNA exonuclease activity DNA endonuclease activity endonuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on DNA nuclease activity catalytic activity, acting on a nucleic acid hydrolase activity double-stranded DNA endonuclease activity catalytic activity DNA nuclease activity DNA binding binding nucleic acid binding DNA exonuclease activity exonuclease activity 5'-flap endonuclease activity flap endonuclease activity DNA endonuclease activity, producing 5'-phosphomonoesters 5'-3' exonuclease activity 5'-3' DNA exonuclease activity DNA exonuclease activity, producing 5'-phosphomonoesters double-stranded DNA 5'-3' DNA exonuclease activity double-stranded DNA exodeoxyribonuclease activity cation binding ion binding metal ion binding small molecule binding	viral DNA genome replication primary metabolic process viral life cycle DNA metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process biosynthetic process viral genome replication viral process metabolic process cellular process viral DNA genome replication primary metabolic process viral life cycle DNA metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process biosynthetic process viral genome replication viral process metabolic process cellular process macromolecule metabolic process DNA biosynthetic process DNA-templated DNA replication lagging strand elongation DNA strand elongation DNA replication DNA replication, Okazaki fragment processing DNA strand elongation involved in DNA replication viral gene expression late viral transcription viral transcription	host intracellular membrane-bounded organelle host cellular component host intracellular part host cell nucleus other organism part host cell nuclear part host intracellular organelle viral replication complex cellular anatomical structure host cell part host intracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR002421	5'-3' exonuclease	Domain
A, B	IPR020045	DNA polymerase I-like, H3TH domain	Domain
A, B	IPR043666	Flap endonuclease D15-like	Family
A, B	IPR038969	Flap endonuclease	Family
A, B	IPR029060	PIN-like domain superfamily	Homologous Superfamily
A, B	IPR036279	5'-3' exonuclease, C-terminal domain superfamily	Homologous Superfamily
A, B	IPR008918	Helix-hairpin-helix motif, class 2	Conserved Site
A, B	IPR020046	5'-3' exonuclease, alpha-helical arch, N-terminal	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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.