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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1ak0a_ 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

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyP1 nuclease 8026389 4001414 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyPhospholipase C/P1 nuclease 8038768 3001513 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AS1-P1_nucleasee1ak0A1 A: alpha bundlesX: Phospholipase C/P1 nuclease (From Topology)H: Phospholipase C/P1 nuclease (From Topology)T: Phospholipase C/P1 nucleaseF: S1-P1_nucleaseECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.10.575.10 Mainly Alpha Orthogonal Bundle P1 Nuclease P1 NucleaseCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF02265S1/P1 Nuclease (S1-P1_nuclease)S1/P1 NucleaseThis family contains both S1 and P1 nucleases (EC:3.1.30.1) which cleave RNA and single stranded DNA with no base specificity.Domain

InterPro: Protein Family Classification InterPro Database Homepage

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

ChainsEnzyme NameDescriptionCatalytic Residues
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
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