Interferon-alpha/beta receptor alpha chain (IFNAR1) is a type I membrane protein that forms one of the two chains of a receptor for interferons alpha and beta. Binding and activation of the receptor stimulates Janus protein kinases; which in turn phosphorylate several proteins; including STAT1 and STAT2. The encoded protein also functions as an antiviral factor. Tyk2 slows down IFNAR1 degradation and that this is due; at least in part; to inhibition of IFNAR1 endocytosis. Mutant versions of IFNAR1; in which Tyr466 is changed to phenylalanine; can act in a dominant negative manner to inhibit phosphorylation of STAT2. These observations are consistent with a model in which IFNAR1 mediates the interaction between JAK kinases and the STAT transcription factors.
Alkaline Phosphatase/ALPI Recombinant Protein (RPES0615)
Met 1-Asp 503
Measured by its ability to cleave a fluorogenic substrate; 4-Methylumbelliferyl phosphate (4-MUP).The specific activity is > 10;000 pmoles/min/µg.
<1.0 EU per µg of the protein as determined by the LAL method.
A DNA sequence encoding the mature form of human ALPI (P09923) (Met 1-Asp 503);without the pro peptide; was fused with a polyhistidine tag at the C-terminus.
> 83 % as determined by reducing SDS-PAGE.
AP Mol Mass:
Lyophilized from sterile PBS; pH 7.4
This product is provided as lyophilized powder which is shipped with ice packs.
Stability and Storage:
Lyophilized proteins are stable for up to 12 months when stored at -20 to -80°C. Reconstituted protein solution can be stored at 4-8°C for 2-7 days. Aliquots of reconstituted samples are stable at < -20°C for 3 months.