1AKO

EXONUCLEASE III FROM ESCHERICHIA COLI

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)
A	d1akoa_	Alpha and beta proteins (a+b)	DNase I-like	DNase I-like	DNase I-like	DNA-repair enzyme exonuclease III	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	DNase I-like	8024345	4002213	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	DNase I-like	8036724	3000957	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)
A	Exo_endo_phos	e1akoA1	A: a+b four layers	X: Carbon-nitrogen hydrolase-like	H: DNase I-like (From Topology)	T: DNase I-like	F: Exo_endo_phos	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.60.10.10	Alpha Beta	4-Layer Sandwich	Deoxyribonuclease I	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03372	Endonuclease/Exonuclease/phosphatase family (Exo_endo_phos)	Endonuclease/Exonuclease/phosphatase family	This large family of proteins includes magnesium dependent endonucleases and a large number of phosphatases involved in intracellular signalling [1]. This family includes: AP endonuclease proteins EC:4.2.99.18 e.g Swiss:P27695, DNase I proteins EC:3. ...	This large family of proteins includes magnesium dependent endonucleases and a large number of phosphatases involved in intracellular signalling [1]. This family includes: AP endonuclease proteins EC:4.2.99.18 e.g Swiss:P27695, DNase I proteins EC:3.1.21.1 e.g. Swiss:P24855, Synaptojanin an inositol-1,4,5-trisphosphate phosphatase EC:3.1.3.56 Swiss:O43426, Sphingomyelinase EC:3.1.4.12 Swiss:P11889 and Nocturnin Swiss:O35710.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	EXONUCLEASE III	double-stranded DNA 3'-5' DNA exonuclease activity DNA exonuclease activity catalytic activity, acting on a nucleic acid 3'-5' exonuclease activity double-stranded DNA exodeoxyribonuclease activity hydrolase activity DNA exonuclease activity, producing 5'-phosphomonoesters DNA nuclease activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters catalytic activity, acting on DNA nuclease activity hydrolase activity, acting on ester bonds 3'-5'-DNA exonuclease activity catalytic activity double-stranded DNA 3'-5' DNA exonuclease activity DNA exonuclease activity catalytic activity, acting on a nucleic acid 3'-5' exonuclease activity double-stranded DNA exodeoxyribonuclease activity hydrolase activity DNA exonuclease activity, producing 5'-phosphomonoesters DNA nuclease activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters catalytic activity, acting on DNA nuclease activity hydrolase activity, acting on ester bonds 3'-5'-DNA exonuclease activity catalytic activity exonuclease activity DNA binding binding nucleic acid binding endonuclease activity cation binding ion binding metal ion binding small molecule binding	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process primary metabolic process DNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process metabolic process macromolecule metabolic process DNA repair	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR005135	Endonuclease/exonuclease/phosphatase	Domain
A	IPR020848	AP endonuclease 1, conserved site	Conserved Site
A	IPR004808	AP endonuclease 1	Family
A	IPR037493	Exodeoxyribonuclease III-like	Family
A	IPR036691	Endonuclease/exonuclease/phosphatase superfamily	Homologous Superfamily
A	IPR020847	AP endonuclease 1, binding site	Binding Site

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

Chains	Enzyme Name	Description	Catalytic Residues
A	exodeoxyribonuclease III M-CSA #160	Exonuclease III from Escherichia coli is a multifunctional enzyme which is able to cleave DNA in order to facilitate the removal of a particular base to create an AP site. This process occurs during replication, allowing incorrectly placed base pairs to be removed and replaced by the correct one. The efficiency of this process is essential to protect Escherichia coli from the damaging effects of mutations, and enables the fidelity of DNA polymerase activity to be increased by over 1000 times.	Defined by 7 residues: ASN:A-7GLU:A-34ASP:A-151ASN:A-153ASP:A-229ASP:A-258HIS:A-259 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.1.11.2 (PDB Primary Data) Search M-CSA Motif + EC 3.1.11.2

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.