Name :
SIRP alpha V3 Protein
Description :
Signal regulatory protein α (SIRPα) is a regulatory membrane glycoprotein from SIRP family expressed mainly by myeloid cells and also by stem cells or neurons.SIRPα acts as inhibitory receptor and interacts with a broadly expressed transmembrane protein CD47 also called the “don´t eat me” signal.Cancer cells highly expressed CD47 that activate SIRP α and inhibit macrophage-mediated destruction.
Species :
Human
Uniprotkb :
HEK293
Tag :
C-His-Avi
Synonyms :
P84, SIRP alpha, CD172a, MFR, MYD-1, PTPNS1, SIRPA, SHPS1, MYD1, SIRP α, BIT, SHPS-1, SIRP α V3
Construction :
Recombinant Human SIRP alpha V3 Protein is expressed from HEK293 with His tag and Avi tag at the C-Terminus. It contains Glu31-Arg369(H54L).[Accession |ATD50864.1]
Protein Purity :
> 95% as determined by Tris-Bis PAGE; > 95% as determined by HPLC
Molecular Weight :
The protein has a predicted MW of 39.8 kDa. Due to glycosylation, the protein migrates to 50-70 kDa based on Tris-Bis PAGE result.
Endotoxin :
Less than 1EU per μg by the LAL method.
Formulatione :
Lyophilized from 0.22μm filtered solution in PBS (pH 7.4). Normally 8% trehalose is added as protectant before lyophilization.
Reconstitution :
Centrifuge the tube before opening. Reconstituting to a concentration more than 100 μg/ml is recommended. Dissolve the lyophilized protein in distilled water.
Stability & Storage :
-20 to -80°C for 12 months as supplied from date of receipt. -20 to -80°C for 3-6 months in unopened state after reconstitution. 2-8°C for 2-7 days after reconstitution. Recommend to aliquot the protein into smaller quantities for optimal storage. Please minimize freeze-thaw cycles.
Shipping :
In general, recombinant proteins are provided as lyophilized powder which are shipped at ambient temperature.Bulk packages of recombinant proteins are provided as frozen liquid. They are shipped out with blue ice unless customers require otherwise.
Research Background :
Signal regulatory protein α (SIRPα) is a regulatory membrane glycoprotein from SIRP family expressed mainly by myeloid cells and also by stem cells or neurons.SIRPα acts as inhibitory receptor and interacts with a broadly expressed transmembrane protein CD47 also called the “don´t eat me” signal.Cancer cells highly expressed CD47 that activate SIRP α and inhibit macrophage-mediated destruction.
References and Literature :
1. Weiskopf K, et al. Engineered SIRPα variants as immunotherapeutic adjuvants to anticancer antibodies[J]. Science, 2013, 341(6141):88-91.
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