Annotations: 1FA0

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1fa0a3	All alpha proteins	PAP/OAS1 substrate-binding domain	PAP/OAS1 substrate-binding domain	Poly(A) polymerase, PAP, middle domain	Poly(A) polymerase, PAP, middle domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
A	d1fa0a1	Alpha and beta proteins (a+b)	Ferredoxin-like	PAP/Archaeal CCA-adding enzyme, C-terminal domain	Poly(A) polymerase, PAP, C-terminal domain	Poly(A) polymerase, PAP, C-terminal domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
A	d1fa0a4	Alpha and beta proteins (a+b)	Nucleotidyltransferase	Nucleotidyltransferase	Poly(A) polymerase, PAP, N-terminal domain	Poly(A) polymerase, PAP, N-terminal domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
B	d1fa0b3	All alpha proteins	PAP/OAS1 substrate-binding domain	PAP/OAS1 substrate-binding domain	Poly(A) polymerase, PAP, middle domain	Poly(A) polymerase, PAP, middle domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
B	d1fa0b1	Alpha and beta proteins (a+b)	Ferredoxin-like	PAP/Archaeal CCA-adding enzyme, C-terminal domain	Poly(A) polymerase, PAP, C-terminal domain	Poly(A) polymerase, PAP, C-terminal domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
B	d1fa0b4	Alpha and beta proteins (a+b)	Nucleotidyltransferase	Nucleotidyltransferase	Poly(A) polymerase, PAP, N-terminal domain	Poly(A) polymerase, PAP, N-terminal domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
B	d1fa0b5	Artifacts	Tags	Tags	Tags	C-terminal Tags	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	PAP/Archaeal CCA-adding enzyme C-terminal domain-like	8035235	3001147	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Nucleotidyltransferase-like	8035234	3000129	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	PAP/OAS1 substrate-binding domain-like	8035233	3000941	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Nucleotidyltransferase-like	8035234	3000129	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	PAP/OAS1 substrate-binding domain-like	8035233	3000941	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	PAP/Archaeal CCA-adding enzyme C-terminal domain-like	8035235	3001147	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)
A	PAP_central_2nd	e1fa0A1	A: alpha arrays	X: HhH/H2TH	H: SAM/DNA-glycosylase	T: PAP/OAS1 substrate-binding domain	F: PAP_central_2nd	ECOD (1.6)
A	PAP_RNA-bind	e1fa0A2	A: a+b two layers	X: Alpha-beta plaits	H: PAP/Archaeal CCA-adding enzyme, C-terminal domain (From Topology)	T: PAP/Archaeal CCA-adding enzyme, C-terminal domain	F: PAP_RNA-bind	ECOD (1.6)
A	PAP_central_1st	e1fa0A3	A: a+b three layers	X: Nucleotidyltransferase-like	H: Nucleotidyltransferase (From Topology)	T: Nucleotidyltransferase	F: PAP_central_1st	ECOD (1.6)
B	PAP_central_2nd	e1fa0B1	A: alpha arrays	X: HhH/H2TH	H: SAM/DNA-glycosylase	T: PAP/OAS1 substrate-binding domain	F: PAP_central_2nd	ECOD (1.6)
B	PAP_RNA-bind	e1fa0B2	A: a+b two layers	X: Alpha-beta plaits	H: PAP/Archaeal CCA-adding enzyme, C-terminal domain (From Topology)	T: PAP/Archaeal CCA-adding enzyme, C-terminal domain	F: PAP_RNA-bind	ECOD (1.6)
B	PAP_central_1st	e1fa0B3	A: a+b three layers	X: Nucleotidyltransferase-like	H: Nucleotidyltransferase (From Topology)	T: Nucleotidyltransferase	F: PAP_central_1st	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.70.590	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Poly(A) polymerase predicted RNA binding domain	CATH (4.3.0)
A	3.30.460.10	Alpha Beta	2-Layer Sandwich	Beta Polymerase	domain 2	CATH (4.3.0)
A	1.10.1410.10	Mainly Alpha	Orthogonal Bundle	Poly(a)-polymerase, middle domain		CATH (4.3.0)
B	3.30.70.590	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Poly(A) polymerase predicted RNA binding domain	CATH (4.3.0)
B	3.30.460.10	Alpha Beta	2-Layer Sandwich	Beta Polymerase	domain 2	CATH (4.3.0)
B	1.10.1410.10	Mainly Alpha	Orthogonal Bundle	Poly(a)-polymerase, middle domain		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF04926	Poly(A) polymerase predicted RNA binding domain (PAP_RNA-bind)	Poly(A) polymerase predicted RNA binding domain	Based on its similarity structurally to the RNA recognition motif this domain is thought to be RNA binding [1].	Domain
A, B	PF04928	Poly(A) polymerase central domain (PAP_central)	Poly(A) polymerase central domain	In eukaryotes, polyadenylation of pre-mRNA plays an essential role in the initiation step of protein synthesis, as well as in the export and stability of mRNAs. Poly(A) polymerase, the enzyme at the heart of the polyadenylation machinery, is a templa ...	In eukaryotes, polyadenylation of pre-mRNA plays an essential role in the initiation step of protein synthesis, as well as in the export and stability of mRNAs. Poly(A) polymerase, the enzyme at the heart of the polyadenylation machinery, is a template-independent RNA polymerase which specifically incorporates ATP at the 3' end of mRNA [1]. This entry represents the central domain.	Domain
A, B	PF01909	Nucleotidyltransferase domain (NTP_transf_2)	Nucleotidyltransferase domain	Members of this family belong to a large family of nucleotidyltransferases [1]. This family includes kanamycin nucleotidyltransferase (KNTase) which is a plasmid-coded enzyme responsible for some types of bacterial resistance to aminoglycosides. KNTa ...	Members of this family belong to a large family of nucleotidyltransferases [1]. This family includes kanamycin nucleotidyltransferase (KNTase) which is a plasmid-coded enzyme responsible for some types of bacterial resistance to aminoglycosides. KNTase in-activates antibiotics by catalysing the addition of a nucleotidyl group onto the drug.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	POLY(A)-POLYMERASE	cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding purine nucleotide binding organic cyclic compound binding anion binding cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding poly(A) RNA polymerase activity adenylyltransferase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding nucleic acid binding	cellular biosynthetic process mRNA 3'-end processing cellular metabolic process RNA metabolic process primary metabolic process gene expression macromolecule biosynthetic process mRNA processing mRNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process biosynthetic process organic substance biosynthetic process cellular biosynthetic process mRNA 3'-end processing cellular metabolic process RNA metabolic process primary metabolic process gene expression macromolecule biosynthetic process mRNA processing mRNA metabolic process nucleic acid metabolic process nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process biosynthetic process organic substance biosynthetic process nucleic acid catabolic process RNA 3'-end processing metabolic process cellular process RNA processing macromolecule metabolic process DNA-templated transcription termination RNA biosynthetic process DNA-templated transcription nucleic acid biosynthetic process transcription by RNA polymerase II termination of RNA polymerase II transcription, poly(A)-coupled nucleobase-containing compound biosynthetic process organic cyclic compound biosynthetic process termination of RNA polymerase II transcription sno(s)RNA processing sno(s)RNA 3'-end processing sno(s)RNA metabolic process ncRNA metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle organelle mRNA cleavage and polyadenylation specificity factor complex mRNA cleavage factor complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR007010	Poly(A) polymerase, RNA-binding domain	Domain
A, B	IPR011068	Nucleotidyltransferase, class I-like, C-terminal	Homologous Superfamily
A, B	IPR007012	Poly(A) polymerase, central domain	Domain
A, B	IPR014492	Poly(A) polymerase	Family
A, B	IPR043519	Nucleotidyltransferase superfamily	Homologous Superfamily
A, B	IPR048840	Poly(A) polymerase, nucleotidyltransferase domain	Domain

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

Chains	Enzyme Name	Description	Catalytic Residues
A	polynucleotide adenylyltransferase M-CSA #796	Poly(A) polymerase (PAP) catalyses the addition of a poly-adenosine tail to almost all eukaryotic mRNAs. This poly(A) tail has numerous functions in eukaryotes: it facilitates transport of the mRNA from the nucleus, regulates mRNA stability, and increases the efficiency of translation. Poly(A) tails are added to mRNA by a multiprotein complex that recognises the polyadenylation signal, cleaves the precursor mRNA, and adds the additional nucleotides. The poly(A) polymerase component retains its polymerase activity when isolated from the holoenzyme assembly and will progressively add long stretches of adenosine nucleotides to an RNA primer in vitro. Across eukaryotes, it appears the catalytic part of the enzyme resides in the NTD while regulation occurs in the CTD.	Defined by 6 residues: SER:A-89ASP:A-100ASP:A-102ASP:A-154LYS:A-215TYR:A-224 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 2.7.7.19 (PDB Primary Data) Search M-CSA Motif + EC 2.7.7.19

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.