Annotations: 1AK0

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ak0a_	All alpha proteins	Phospholipase C/P1 nuclease	Phospholipase C/P1 nuclease	P1 nuclease	P1 nuclease	(Penicillium citrinum ) [TaxId: 5077 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	P1 nuclease	8026389	4001414	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Phospholipase C/P1 nuclease	8038768	3001513	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	S1-P1_nuclease	e1ak0A1	A: alpha bundles	X: Phospholipase C/P1 nuclease (From Topology)	H: Phospholipase C/P1 nuclease (From Topology)	T: Phospholipase C/P1 nuclease	F: S1-P1_nuclease	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.575.10	Mainly Alpha	Orthogonal Bundle	P1 Nuclease	P1 Nuclease	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02265	S1/P1 Nuclease (S1-P1_nuclease)	S1/P1 Nuclease	This family contains both S1 and P1 nucleases (EC:3.1.30.1) which cleave RNA and single stranded DNA with no base specificity.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	P1 NUCLEASE	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	catabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process macromolecule catabolic process nucleobase-containing compound catabolic process nucleobase-containing compound metabolic process DNA catabolic process nucleic acid catabolic process metabolic process cellular process macromolecule metabolic process	cellular anatomical structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR003154	S1/P1 nuclease	Family
A	IPR008947	Phospholipase C/P1 nuclease domain superfamily	Homologous Superfamily

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

Chains	Enzyme Name	Description	Catalytic Residues
A	nuclease P1 M-CSA #395	P1 nuclease is a 36 kDa glycoprotein that cleaves its substrate at every position yielding nucleoside 5' monophosphates, and it does not recognize or act on double-stranded DNA [PMID: 9726413]. It is useful at removing single stranded strands hanging off the end of double stranded DNA and at completely cleaving melted DNA for simple DNA composition analysis. The enzyme is a phosphodiesterase cleaving the P-O3' bond with inversion of configuration at the phosphorus, but also acts as a phosphomonesterase removing 3'-terminal phosphate groups. It has no apparent specificity for bases.	Defined by 10 residues: TRP:A-1HIS:A-6ASP:A-45ARG:A-48HIS:A-60HIS:A-116ASP:A-120HIS:A-126HIS:A-149ASP:A-153 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.1.30.1 (PDB Primary Data) Search M-CSA Motif + EC 3.1.30.1

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.