Annotations: 2KFN

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth A]	d2kfna1	Alpha and beta proteins (a/b)	Ribonuclease H-like motif	Ribonuclease H-like	DnaQ-like 3'-5' exonuclease	Exonuclease domain of prokaryotic DNA polymerase	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
B [auth A]	d2kfna2	Multi-domain proteins (alpha and beta)	DNA/RNA polymerases	DNA/RNA polymerases	DNA polymerase I	DNA polymerase I (Klenow fragment)	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B [auth A]	SCOP2B Superfamily	Ribonuclease H-like	8044537	3000143	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	Nucleotide cyclase/DNA polymerase palm domain-like	8037488	3001272	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	Nucleotide cyclase/DNA polymerase palm domain-like	8037488	3001272	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 [auth A]	PF00476	e2kfnA1	A: alpha arrays	X: helical bundle in Bacillus stearothermophilus-like DNA polymerase I (From Topology)	H: helical bundle in Bacillus stearothermophilus-like DNA polymerase I (From Topology)	T: helical bundle in Bacillus stearothermophilus-like DNA polymerase I	F: PF00476	ECOD (1.6)
B [auth A]	PF00476	e2kfnA2	A: alpha bundles	X: fingers domain in bacteriophage RB69-like DNA polymerase I (From Topology)	H: fingers domain in bacteriophage RB69-like DNA polymerase I (From Topology)	T: fingers domain in bacteriophage RB69-like DNA polymerase I	F: PF00476	ECOD (1.6)
B [auth A]	PF00476	e2kfnA3	A: a+b two layers	X: Alpha-beta plaits	H: Adenylyl and guanylyl cyclase catalytic domain-like	T: Adenylyl and guanylyl cyclase catalytic domain-like	F: PF00476	ECOD (1.6)
B [auth A]	PF01612	e2kfnA4	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: PF01612	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B [auth A]	3.30.420.10	Alpha Beta	2-Layer Sandwich	Nucleotidyltransferase	domain 5	CATH (4.3.0)
B [auth A]	1.20.1060.10	Mainly Alpha	Up-down Bundle	Taq DNA Polymerase	Chain T, domain 4	CATH (4.3.0)
B [auth A]	3.30.70.370	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
B [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
B [auth A]	PF01612	3'-5' exonuclease (DNA_pol_A_exo1)	3'-5' exonuclease	This domain is responsible for the 3'-5' exonuclease proofreading activity of E. coli DNA polymerase I (polI) and other enzymes, it catalyses the hydrolysis of unpaired or mismatched nucleotides. This domain consists of the amino-terminal half of the ...	This domain is responsible for the 3'-5' exonuclease proofreading activity of E. coli DNA polymerase I (polI) and other enzymes, it catalyses the hydrolysis of unpaired or mismatched nucleotides. This domain consists of the amino-terminal half of the Klenow fragment in E. coli polI it is also found in the Werner syndrome helicase (WRN), focus forming activity 1 protein (FFA-1) and ribonuclease D (RNase D). Werner syndrome is a human genetic disorder causing premature aging; the WRN protein has helicase activity in the 3'-5' direction [4,5]. The FFA-1 protein is required for formation of a replication foci and also has helicase activity; it is a homologue of the WRN protein [3]. RNase D is a 3'-5' exonuclease involved in tRNA processing. Also found in this family is the autoantigen PM/Scl thought to be involved in polymyositis-scleroderma overlap syndrome.	Domain
B [auth A]	PF00476	DNA polymerase family A (DNA_pol_A)	DNA polymerase family A	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B]	5'-D(GPCPTPTPAP(US1)P*G)-3'	-	-	-
B [auth A]	KLENOW FRAGMENT OF DNA POLYMERASE I	nuclease activity hydrolase activity, acting on ester bonds 5'-3' exonuclease activity hydrolase activity exonuclease activity catalytic activity catalytic activity, acting on DNA DNA-directed DNA polymerase activity DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity nucleotidyltransferase activity transferase activity, transferring phosphorus-containing groups DNA binding nuclease activity hydrolase activity, acting on ester bonds 5'-3' exonuclease activity hydrolase activity exonuclease activity catalytic activity catalytic activity, acting on DNA DNA-directed DNA polymerase activity DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity nucleotidyltransferase activity transferase activity, transferring phosphorus-containing groups DNA binding binding organic cyclic compound binding nucleic acid binding 3'-5' exonuclease activity	cellular metabolic process cellular nitrogen compound metabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA replication organic substance metabolic process heterocycle metabolic process nitrogen compound metabolic process metabolic process cellular process macromolecule metabolic process cellular metabolic process cellular nitrogen compound metabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA replication organic substance metabolic process heterocycle metabolic process nitrogen compound metabolic process metabolic process cellular process macromolecule metabolic process cellular aromatic compound metabolic process DNA-templated DNA replication cellular response to stimulus response to stimulus cellular response to stress DNA damage response response to stress DNA repair base-excision repair double-strand break repair	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth A]	IPR036397	Ribonuclease H superfamily	Homologous Superfamily
B [auth A]	IPR002421	5'-3' exonuclease	Domain
B [auth A]	IPR008918	Helix-hairpin-helix motif, class 2	Conserved Site
B [auth A]	IPR002298	DNA polymerase A	Family
B [auth A]	IPR019760	DNA-directed DNA polymerase, family A, conserved site	Conserved Site
B [auth A]	IPR012337	Ribonuclease H-like superfamily	Homologous Superfamily
B [auth A]	IPR002562	3'-5' exonuclease domain	Domain
B [auth A]	IPR043502	DNA/RNA polymerase superfamily	Homologous Superfamily
B [auth A]	IPR020045	DNA polymerase I-like, H3TH domain	Domain
B [auth A]	IPR001098	DNA-directed DNA polymerase, family A, palm domain	Domain
B [auth A]	IPR029060	PIN-like domain superfamily	Homologous Superfamily
B [auth A]	IPR036279	5'-3' exonuclease, C-terminal domain superfamily	Homologous Superfamily
B [auth A]	IPR020046	5'-3' exonuclease, alpha-helical arch, N-terminal	Domain
B [auth A]	IPR018320	DNA polymerase 1	Family

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.