2O3B

Crystal structure complex of Nuclease A (NucA) with intra-cellular inhibitor NuiA

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

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2o3ba1	Alpha and beta proteins (a+b)	His-Me finger endonucleases	His-Me finger endonucleases	DNA/RNA non-specific endonuclease	Nuclease NucA	(Nostoc sp. PCC 7120 = FACHB-418 ) [TaxId: 103690 ],	SCOPe (2.08)
A	d2o3ba2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Nostoc sp. PCC 7120 = FACHB-418 ) [TaxId: 103690 ],	SCOPe (2.08)
B	d2o3bb2	Alpha and beta proteins (a+b)	Nuclease A inhibitor (NuiA)	Nuclease A inhibitor (NuiA)	Nuclease A inhibitor (NuiA)	automated matches	(Nostoc sp. PCC 7120 = FACHB-418 ) [TaxId: 103690 ],	SCOPe (2.08)
B	d2o3bb3	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Nostoc sp. PCC 7120 = FACHB-418 ) [TaxId: 103690 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	DNA/RNA non-specific endonuclease	8020904	4000890	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	His-Me finger endonucleases	8033284	3001893	SCOP2 (2022-06-29)
B	SCOP2 Family	Nuclease A inhibitor (NuiA)	8031005	4003180	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Nuclease A inhibitor (NuiA)	8043383	3000380	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	PF01223	e2o3bA1	A: few secondary structure elements	X: His-Me finger endonucleases (From Homology)	H: His-Me finger endonucleases	T: His-Me finger endonucleases	F: PF01223	ECOD (1.6)
B	PF07924	e2o3bB1	A: a+b two layers	X: Cystatin-like	H: Nuclease A inhibitor (NuiA)-related (From Topology)	T: Nuclease A inhibitor (NuiA)-related	F: PF07924	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.570.10	Alpha Beta	3-Layer(aba) Sandwich	Extracellular Endonuclease	Chain A	CATH (4.3.0)
B	3.40.1460.10	Alpha Beta	3-Layer(aba) Sandwich	Nuia	Nuclease A inhibitor-like	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01223	DNA/RNA non-specific endonuclease (Endonuclease_NS)	DNA/RNA non-specific endonuclease	-	Domain
B	PF07924	Nuclease A inhibitor-like protein (NuiA)	Nuclease A inhibitor-like protein	This family consists of protein sequences that are similar to the nuclease A inhibitor expressed by bacteria of the genus Anabaena ((NuiA, Swiss:Q44296). This sequence is organised to form an alpha-beta-alpha sandwich fold, which is similar to the PR ...	This family consists of protein sequences that are similar to the nuclease A inhibitor expressed by bacteria of the genus Anabaena ((NuiA, Swiss:Q44296). This sequence is organised to form an alpha-beta-alpha sandwich fold, which is similar to the PR-1-like fold. NuiA interacts with nuclease A by means of residues located at one end of the molecule, including residues making up the loop between helices III and IV and the loop between strands C and D. The mechanism of inhibition of nuclease A by NuiA is as yet incompletely understood [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Nuclease	binding organic cyclic compound binding nucleic acid binding endonuclease activity nuclease activity hydrolase activity, acting on ester bonds hydrolase activity catalytic activity cation binding ion binding metal ion binding small molecule binding	-	periplasmic space cellular anatomical entity
B	Sugar-non-specific nuclease inhibitor	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR018524	DNA/RNA non-specific endonuclease, active site	Active Site
A	IPR001604	DNA/RNA non-specific endonuclease	Domain
A	IPR044929	DNA/RNA non-specific endonuclease superfamily	Homologous Superfamily
A	IPR020821	Extracellular Endonuclease, subunit A	Domain
A	IPR044925	His-Me finger superfamily	Homologous Superfamily
A	IPR040255	Non-specific endonuclease	Family
B	IPR012489	Nuclease A inhibitor-like	Family
B	IPR036587	Nuclease A inhibitor-like superfamily	Homologous Superfamily

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.