Annotations: 1WHU

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1whua1	All alpha proteins	DNA/RNA-binding 3-helical bundle	Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3	Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3	Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d1whua3	Artifacts	Tags	Tags	Tags	C-terminal Tags	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d1whua2	Artifacts	Tags	Tags	Tags	N-terminal Tags	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI) domain 3	8031177	4000738	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI) domain 3	8043555	3001199	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	PF03726	e1whuA1	A: alpha arrays	X: HTH	H: Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3 (From Topology)	T: Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3	F: PF03726	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.10.400	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Polyribonucleotide nucleotidyltransferase, RNA-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03726	Polyribonucleotide nucleotidyltransferase, RNA binding domain (PNPase)	Polyribonucleotide nucleotidyltransferase, RNA binding domain	This family contains the RNA binding domain of Polyribonucleotide nucleotidyltransferase (PNPase) PNPase is involved in mRNA degradation in a 3'-5' direction.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	polynucleotide phosphorylase; 3'-5' RNA exonuclease	3'-5'-RNA exonuclease activity catalytic activity, acting on RNA RNA exonuclease activity, producing 5'-phosphomonoesters catalytic activity, acting on a nucleic acid 3'-5' exonuclease activity RNA exonuclease activity RNA nuclease activity hydrolase activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters nuclease activity hydrolase activity, acting on ester bonds exonuclease activity catalytic activity identical protein binding 3'-5'-RNA exonuclease activity catalytic activity, acting on RNA RNA exonuclease activity, producing 5'-phosphomonoesters catalytic activity, acting on a nucleic acid 3'-5' exonuclease activity RNA exonuclease activity RNA nuclease activity hydrolase activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters nuclease activity hydrolase activity, acting on ester bonds exonuclease activity catalytic activity identical protein binding protein binding binding regulatory RNA binding RNA binding organic cyclic compound binding miRNA binding nucleic acid binding poly(G) binding poly-purine tract binding single-stranded RNA binding polyribonucleotide nucleotidyltransferase activity transferase activity nucleotidyltransferase activity transferase activity, transferring phosphorus-containing groups poly-pyrimidine tract binding poly(U) RNA binding	cellular response to stimulus regulation of biological process regulation of cellular process regulation of cellular senescence response to stimulus cellular metabolic process biological regulation cellular senescence regulation of cellular metabolic process cellular response to stress response to stress cellular process metabolic process regulation of metabolic process cellular response to stimulus regulation of biological process regulation of cellular process regulation of cellular senescence response to stimulus cellular metabolic process biological regulation cellular senescence regulation of cellular metabolic process cellular response to stress response to stress cellular process metabolic process regulation of metabolic process RNA transport nitrogen compound transport transport organic substance transport nucleic acid transport mitochondrial transmembrane transport establishment of localization transmembrane transport localization import into the mitochondrion RNA import into mitochondrion establishment of RNA localization macromolecule localization RNA localization nucleobase-containing compound transport mitochondrial transport cellular biosynthetic process RNA metabolic process primary metabolic process gene expression mRNA processing mRNA metabolic process macromolecule biosynthetic 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 macromolecule metabolic process RNA processing response to interferon-beta response to organic substance response to cytokine cellular response to interferon-beta cellular response to chemical stimulus response to chemical cellular response to cytokine stimulus cellular response to organic substance catabolic process positive regulation of biological process positive regulation of miRNA metabolic process macromolecule catabolic process regulation of primary metabolic process positive regulation of metabolic process regulation of RNA metabolic process regulation of miRNA metabolic process positive regulation of macromolecule metabolic process regulation of miRNA catabolic process regulation of nucleobase-containing compound metabolic process miRNA metabolic process RNA catabolic process positive regulation of nucleobase-containing compound metabolic process regulation of macromolecule metabolic process regulation of catabolic process miRNA catabolic process organic cyclic compound catabolic process nucleobase-containing compound catabolic process positive regulation of catabolic process positive regulation of RNA metabolic process ncRNA metabolic process nucleic acid catabolic process positive regulation of miRNA catabolic process organic substance catabolic process response to oxidative stress cellular response to oxidative stress cellular response to chemical stress response to growth hormone response to hormone response to endogenous stimulus response to organonitrogen compound response to peptide hormone response to oxygen-containing compound response to nitrogen compound response to organophosphorus response to purine-containing compound response to cAMP response to organic cyclic compound protein-containing complex organization protein trimerization cellular component organization cellular component biogenesis cellular component assembly protein homotrimerization protein complex oligomerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis regulation of growth negative regulation of growth negative regulation of biological process growth positive regulation of mitochondrial RNA catabolic process regulation of mitochondrial RNA catabolic process mitochondrial RNA catabolic process mitochondrial RNA metabolic process negative regulation of cellular metabolic process mRNA catabolic process negative regulation of metabolic process positive regulation of mRNA metabolic process negative regulation of cellular biosynthetic process regulation of gene expression negative regulation of gene expression negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process regulation of mRNA catabolic process negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of cellular biosynthetic process positive regulation of mRNA catabolic process negative regulation of biosynthetic process regulation of mRNA metabolic process rRNA import into mitochondrion rRNA transport mitochondrial mRNA catabolic process developmental process multicellular organismal process gland development animal organ development animal organ regeneration liver development regeneration multicellular organism development hepaticobiliary system development anatomical structure development liver regeneration system development mitochondrial gene expression mitochondrial RNA processing RNA 3'-end processing mitochondrial RNA 3'-end processing post-transcriptional regulation of gene expression nuclear polyadenylation-dependent mRNA catabolic process regulation of biological quality polyadenylation-dependent mRNA catabolic process mRNA destabilization RNA destabilization regulation of mRNA stability regulation of RNA stability cell cycle regulation of cell cycle mitochondrial RNA 5'-end processing RNA 5'-end processing organelle organization mitochondrion organization cellular respiration energy derivation by oxidation of organic compounds regulation of generation of precursor metabolites and energy generation of precursor metabolites and energy regulation of cellular respiration tRNA processing mitochondrial tRNA processing mitochondrial mRNA polyadenylation tRNA metabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle mitochondrial protein-containing complex protein-containing complex catalytic complex mitochondrion intracellular membrane-bounded organelle cytoplasmic exosome (RNase complex) intracellular organelle exosome (RNase complex) mitochondrial degradosome intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle mitochondrial protein-containing complex protein-containing complex catalytic complex mitochondrion intracellular membrane-bounded organelle cytoplasmic exosome (RNase complex) intracellular organelle exosome (RNase complex) mitochondrial degradosome organelle exoribonuclease complex mitochondrial intermembrane space membrane-enclosed lumen intracellular organelle lumen organelle envelope lumen organelle envelope organelle lumen mitochondrial envelope intracellular non-membrane-bounded organelle ribosome non-membrane-bounded organelle organelle subcompartment membrane endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum organelle membrane endoplasmic reticulum membrane mitochondrial matrix

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR027408	PNPase/RNase PH domain superfamily	Homologous Superfamily
A	IPR020568	Ribosomal protein uS5 domain 2-type superfamily	Homologous Superfamily
A	IPR003029	S1 domain	Domain
A	IPR015848	Polyribonucleotide nucleotidyltransferase, RNA-binding domain	Domain
A	IPR036345	Exoribonuclease, PH domain 2 superfamily	Homologous Superfamily
A	IPR012340	Nucleic acid-binding, OB-fold	Homologous Superfamily
A	IPR004088	K Homology domain, type 1	Domain
A	IPR004087	K Homology domain	Domain
A	IPR012162	Polyribonucleotide nucleotidyltransferase	Family
A	IPR036612	K Homology domain, type 1 superfamily	Homologous Superfamily
A	IPR036456	Polyribonucleotide nucleotidyltransferase, RNA-binding domain superfamily	Homologous Superfamily
A	IPR015847	Exoribonuclease, phosphorolytic domain 2	Domain
A	IPR001247	Exoribonuclease, phosphorolytic domain 1	Domain

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 R01GM133198.