UniProt functional annotation for Q9DAR7



	UniProt functional annotation for Q9DAR7

UniProt code: Q9DAR7.

Organism: Mus musculus (Mouse).

Taxonomy: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae; Murinae; Mus; Mus.

Function: Decapping scavenger enzyme that catalyzes the cleavage of a residual cap structure following the degradation of mRNAs by the 3'->5' exosome-mediated mRNA decay pathway. Hydrolyzes cap analog structures like 7-methylguanosine nucleoside triphosphate (m7GpppG) with up to 10 nucleotide substrates (small capped oligoribonucleotides) and specifically releases 5'-phosphorylated RNA fragments and 7- methylguanosine monophosphate (m7GMP). Cleaves cap analog structures like tri-methyl guanosine nucleoside triphosphate (m3(2,2,7)GpppG) with very poor efficiency. Does not hydrolyze unmethylated cap analog (GpppG) and shows no decapping activity on intact m7GpppG-capped mRNA molecules longer than 25 nucleotides. Does not hydrolyze 7- methylguanosine diphosphate (m7GDP) to m7GMP. May also play a role in the 5'->3 mRNA decay pathway; m7GDP, the downstream product released by the 5'->3' mRNA mediated decapping activity, may be also converted by DCPS to m7GMP. Binds to m7GpppG and strongly to m7GDP. Plays a role in first intron splicing of pre-mRNAs. Inhibits activation-induced cell death. {ECO:0000250}.

Catalytic activity: Reaction=a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in mRNA + H2O = a 5'-end diphospho-ribonucleoside in mRNA + 2 H(+) + N(7)-methyl-GMP; Xref=Rhea:RHEA:65388, Rhea:RHEA-COMP:17165, Rhea:RHEA-COMP:17167, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:58285, ChEBI:CHEBI:156461, ChEBI:CHEBI:167616; EC=3.6.1.59; Evidence={ECO:0000250|UniProtKB:Q96C86};

Activity regulation: The hydrolytic product 7-methylguanosine diphosphate (m7GDP) efficiently inhibits the decapping scavenger activity and acts as a competitive inhibitor in vitro. Inhibited by 2,4-diaminoquinazoline. {ECO:0000250}.

Subunit: Homodimer. Associates with components of the exosome multienzyme ribonuclease complex, such as EXOSC3 and EXOSC4. Interacts with NDOR1. {ECO:0000250}.

Subcellular location: Cytoplasm {ECO:0000250}. Nucleus {ECO:0000250}. Note=Predominantly localized in the nucleus. Nucleocytoplasmic shuttling protein that can transiently enter the cytoplasm in mammalian cells in a XPO1/CRM1-dependent manner. {ECO:0000250}.

Domain: The C-terminal histidine triad (HIT) motif and the N-terminal domain are required for the decapping activity. The N-terminus is necessary but not sufficient for binding cap structures. {ECO:0000250}.

Similarity: Belongs to the HIT family. {ECO:0000305}.

Annotations taken from UniProtKB at the EBI.


Organism:		Mus musculus (Mouse).
Taxonomy:		Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae; Murinae; Mus; Mus.



Function:		Decapping scavenger enzyme that catalyzes the cleavage of a residual cap structure following the degradation of mRNAs by the 3'->5' exosome-mediated mRNA decay pathway. Hydrolyzes cap analog structures like 7-methylguanosine nucleoside triphosphate (m7GpppG) with up to 10 nucleotide substrates (small capped oligoribonucleotides) and specifically releases 5'-phosphorylated RNA fragments and 7- methylguanosine monophosphate (m7GMP). Cleaves cap analog structures like tri-methyl guanosine nucleoside triphosphate (m3(2,2,7)GpppG) with very poor efficiency. Does not hydrolyze unmethylated cap analog (GpppG) and shows no decapping activity on intact m7GpppG-capped mRNA molecules longer than 25 nucleotides. Does not hydrolyze 7- methylguanosine diphosphate (m7GDP) to m7GMP. May also play a role in the 5'->3 mRNA decay pathway; m7GDP, the downstream product released by the 5'->3' mRNA mediated decapping activity, may be also converted by DCPS to m7GMP. Binds to m7GpppG and strongly to m7GDP. Plays a role in first intron splicing of pre-mRNAs. Inhibits activation-induced cell death. {ECO:0000250}.


Catalytic activity:		Reaction=a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in mRNA + H2O = a 5'-end diphospho-ribonucleoside in mRNA + 2 H(+) + N(7)-methyl-GMP; Xref=Rhea:RHEA:65388, Rhea:RHEA-COMP:17165, Rhea:RHEA-COMP:17167, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:58285, ChEBI:CHEBI:156461, ChEBI:CHEBI:167616; EC=3.6.1.59; Evidence={ECO:0000250\|UniProtKB:Q96C86};
Activity regulation:		The hydrolytic product 7-methylguanosine diphosphate (m7GDP) efficiently inhibits the decapping scavenger activity and acts as a competitive inhibitor in vitro. Inhibited by 2,4-diaminoquinazoline. {ECO:0000250}.
Subunit:		Homodimer. Associates with components of the exosome multienzyme ribonuclease complex, such as EXOSC3 and EXOSC4. Interacts with NDOR1. {ECO:0000250}.
Subcellular location:		Cytoplasm {ECO:0000250}. Nucleus {ECO:0000250}. Note=Predominantly localized in the nucleus. Nucleocytoplasmic shuttling protein that can transiently enter the cytoplasm in mammalian cells in a XPO1/CRM1-dependent manner. {ECO:0000250}.
Domain:		The C-terminal histidine triad (HIT) motif and the N-terminal domain are required for the decapping activity. The N-terminus is necessary but not sufficient for binding cap structures. {ECO:0000250}.
Similarity:		Belongs to the HIT family. {ECO:0000305}.