RNA-dependent helicase and ATPase required for nonsense-mediated decay (NMD) of mRNAs containing premature stop codons.
Is recruited to mRNAs upon translation termination and undergoes a cycle of phosphorylation and dephosphorylation; its phosphorylation appears to be a key step in NMD.
Recruited by release factors to stalled ribosomes together with the SMG1C protein kinase complex to form the transient SURF (SMG1-UPF1-eRF1-eRF3) complex.
In EJC-dependent NMD, the SURF complex associates with the exon junction complex (EJC) (located 50-55 or more nucleotides downstream from the termination codon) through UPF2 and allows the formation of an UPF1- UPF2-UPF3 surveillance complex which is believed to activate NMD.
Phosphorylated UPF1 is recognized by EST1B/SMG5, SMG6 and SMG7 whichare thought to provide a link to the mRNA degradation machinery involvingexonucleolytic and endonucleolytic pathways, and to serve as adapters toprotein phosphatase 2A (PP2A), thereby triggering UPF1 dephosphorylation and allowing the recycling of NMD factors.
UPF1 can also activate NMD without UPF2 or UPF3, and in the absence of the NMD-enhancing downstream EJC indicative for alternative NMD pathways.
Plays a role in replication-dependent histone mRNA degradation at the end of phase S; the function is independent of UPF2.
For the recognition of premature termination codons (PTC) and initiation of NMD a competitive interaction between UPF1 and PABPC1 with the ribosome-bound release factors is proposed.
The ATPase activity of UPF1 is required for disassembly of mRNPs undergoing NMD.
Essential for embryonicviability.
Applications:Suitable for use in ELISA and Immunofluorescence.
Other applications not tested.
Recommended Dilution:Immunofluorescence: 1:50-1:200Optimal dilutions to be determined by the researcher.
Storage and Stability:May be stored at 4°C for short-term only.
Aliquot to avoid repeated freezing and thawing.
Store at -20°C.
Aliquots are stable for 12 months after receipt.
For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
仕様
Size：100ug
Host：rabbit
Source Antibody：human
Grade：Affinity Purified
Purity：Purified by Protein G affinity chromatography.
Form：Supplied as a liquid in 0.01M PBS, pH 7.4, 0.03% Proclin 300, 50% glycerol.
Specificity：Recognizes human UPF1.
Isotype：IgG
Calc Applications Abbrev：E IF
Calc Crossreactivity：Hu
Immunogen：Recombinant protein corresponding to aa956-1125 from human regulator of nonsense transcripts 1 protein.
