Annotations: 2IHN

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth A]	d2ihna1	All alpha proteins	SAM domain-like	5' to 3' exonuclease, C-terminal subdomain	5' to 3' exonuclease, C-terminal subdomain	T4 RNase H	(Tequatrovirus T4 ) [TaxId: 10665 ],	SCOPe (2.08)
C [auth A]	d2ihna2	Alpha and beta proteins (a/b)	PIN domain-like	PIN domain-like	5' to 3' exonuclease catalytic domain	T4 RNase H	(Tequatrovirus T4 ) [TaxId: 10665 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth A]	SCOP2B Superfamily	PIN domain-like	8044457	3001041	SCOP2B (2022-06-29)
C [auth A]	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8037730	3000537	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)
C [auth A]	RNaseH_C	e2ihnA1	A: alpha arrays	X: HhH/H2TH	H: SAM/DNA-glycosylase	T: SAM domain-like	F: RNaseH_C	ECOD (1.6)
C [auth A]	5_3_exonuc_N	e2ihnA2	A: a/b three-layered sandwiches	X: HAD domain-like	H: HAD domain-related	T: PIN domain-like	F: 5_3_exonuc_N	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

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

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A]	PF02739	5'-3' exonuclease, N-terminal resolvase-like domain (5_3_exonuc_N)	5'-3' exonuclease, N-terminal resolvase-like domain	-	Domain
C [auth A]	PF09293	T4 RNase H, C terminal (RNaseH_C)	T4 RNase H, C terminal	Members of this family are found in T4 RNaseH ribonuclease, and adopt a SAM domain-like fold, consisting of a bundle of four/five helices. These residues may have a role in providing a docking site for other proteins or enzymes in the replication for ...	Members of this family are found in T4 RNaseH ribonuclease, and adopt a SAM domain-like fold, consisting of a bundle of four/five helices. These residues may have a role in providing a docking site for other proteins or enzymes in the replication fork [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C]	5'-D(CPTPAPAPCPTPTPTPGPAPGPGPCPAPGPAPCPC)-3'	-	-	-
B [auth D]	5'-D(GPGPTPCPTPGPCPCPTPCPAPAPGPAPCPGPGPTPAPGPTPCPAPA)-3'	-	-	-
C [auth A]	Ribonuclease H	DNA binding binding organic cyclic compound binding nucleic acid binding 5'-flap endonuclease activity endonuclease activity catalytic activity, acting on a nucleic acid endodeoxyribonuclease activity, producing 5'-phosphomonoesters hydrolase activity DNA nuclease activity DNA endonuclease activity nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on DNA DNA binding binding organic cyclic compound binding nucleic acid binding 5'-flap endonuclease activity endonuclease activity catalytic activity, acting on a nucleic acid endodeoxyribonuclease activity, producing 5'-phosphomonoesters hydrolase activity DNA nuclease activity DNA endonuclease activity nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on DNA flap endonuclease activity endonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters catalytic activity RNA endonuclease activity, producing 5'-phosphomonoesters catalytic activity, acting on RNA RNA-DNA hybrid ribonuclease activity RNA nuclease activity RNA endonuclease activity 5'-3' RNA exonuclease activity 5'-3' exonuclease activity RNA exonuclease activity, producing 5'-phosphomonoesters RNA exonuclease activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters exonuclease activity	DNA-templated DNA replication lagging strand elongation primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA strand elongation organic substance metabolic process DNA replication DNA replication, Okazaki fragment processing metabolic process DNA strand elongation involved in DNA replication macromolecule metabolic process DNA-templated DNA replication lagging strand elongation primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA strand elongation organic substance metabolic process DNA replication DNA replication, Okazaki fragment processing metabolic process DNA strand elongation involved in DNA replication macromolecule metabolic process DNA replication, removal of RNA primer catabolic process RNA metabolic process macromolecule catabolic process organic cyclic compound catabolic process nucleobase-containing compound catabolic process nucleic acid catabolic process organic substance catabolic process RNA catabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A]	IPR002421	5'-3' exonuclease	Domain
C [auth A]	IPR036276	T4 RNase H, C-terminal	Domain
C [auth A]	IPR038969	Flap endonuclease	Family
C [auth A]	IPR029060	PIN-like domain superfamily	Homologous Superfamily
C [auth A]	IPR036279	5'-3' exonuclease, C-terminal domain superfamily	Homologous Superfamily
C [auth A]	IPR008918	Helix-hairpin-helix motif, class 2	Conserved Site
C [auth A]	IPR020046	5'-3' exonuclease, alpha-helical arch, N-terminal	Domain

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.