Recombinant Human SIRP alpha/CD172a Protein

重组人SIRP alpha/CD172a蛋白 | 重组人信号调节蛋白α

BIT | BITbrain-immunoglobulin-like molecule with tyrosine-based activation motifs | Brain Ig-like molecule with tyrosine-based activation motifs | CD172 antigen-like family member A | CD172a antigen | CD172a | Inhibitory receptor SHPS-1 | Macrophage fusio

rp183642-10μg

10μg

无动物源

≥95%(SDS-PAGE)

Signal regulatory protein alpha (SIRP alpha, designated CD172a), also called SHPS-1 (SHP substrate 1) and previously, MyD-1 (Myeloid/Dendritic-1), is a monomeric ~90 kDa type I transmembrane glycoprotein that belongs to the SIRP/SHPS (CD172) family of the immunoglobulin superfamily. SIRPs are paired receptors, with similar extracellular domains but differing C-termini and functions. The 503 amino acid (aa) human SIRP alpha contains a 342 aa extracellular domain (ECD), with one V-type, and two C1 type Ig domains, and three potential N glycosylation sites. It has a 110 aa cytoplasmic sequence with ITIM motifs that recruit tyrosine phosphatases SHP-1 and SHP-2 when phosphorylated. Human SIRP alpha has more than 40 described polymorphisms, including the prominent BIT (Brain Ig like molecule with Tyrosine-based activation motifs, also called SIRP alpha 2 or PTPNS). One reported isoform lacks aa 1-101, which eliminates most of the V type Ig domain. Human SIRP alpha ECD shares 61%, 60%, 71%, 72% and 73% aa identity with mouse, rat, porcine, bovine and equine SIRP alpha, respectively; it shares 84% and 76% aa identity with human SIRP beta 1 and SIRP gamma, respectively. SIRP alpha is expressed mainly on myeloid cells, including macrophages, neutrophils, dendritic and Langerhans cells. It is also found on neurons, smooth muscle and endothelial cells. SIRP alpha shows adhesion to the ubiquitous CD47/IAP (integrin associated protein), while SIRP gamma binds more weakly and SIRP alpha 1 does not bind at all. Mouse and human SIRP alpha -CD47 binding only cross-reacts for specific polymorphisms and influences engraftment of xenotransplanted stem cells. SIRP alpha engagement generally produces a negative regulatory signal. Low SIRP alpha recognition of CD47, which occurs on aged erythrocytes or platelets or xenogenic cells, promotes clearance of CD47low cells from circulation. SIRP alpha recognition of surfactants SP-A and SP-D in the lung can inhibit alveolar macrophage cytokine production. The CD47 integrin-SIRP alpha interaction is reported to promote macrophage fusion during osteoclastogenesis. Post-translational: N-glycosylated. Phosphorylated on tyrosine residues in response to stimulation with EGF, growth hormone, insulin and PDGF. Dephosphorylated by PTPN11.

Measured by the ability of the immobilized protein to support the adhesion of human red blood cells. Red blood cells, added at 10 x 106 cells/mL (100 µL/well) to SIRP alpha coated plates, will adhere after 1 hour at 37° C. The ED50 for this effect is1.5 µg/mL.​ Immobilized Recombinant Human SIRP alpha/CD172a Protein (rp183642) at 1.0 μg/mL can bind Recombinant Human CD47 Protein (rp144028) with the EC50 of 829.1 ng/mL. Immobilized Recombinant Human SIRP alpha/CD172a Protein (rp183642) at 2.0 μg/mL can bind Recombinant Human CD47 Protein (rp169585) with the EC50 of 308.6 ng/mL.

重组表达

38.1 kDa

C-His

47.4-56.4 kDa, under reducing conditions; 46.1-53.4 kDa, under non-reducing conditions.

HEK293 Accession #: P78324 | HEK293

<1.0 EU/μg

人(Human)

1-370 aa

MEPAGPAPGRLGPLLCLLLAASCAWSGVAGEEELQVIQPDKSVLVAAGETATLRCTATSLIPVGPIQWFRGAGPGRELIYNQKEGHFPRVTTVSDLTKRNNMDFSIRIGNITPADAGTYYCVKFRKGSPDDVEFKSGAGTELSVRAKPSAPVVSGPAARATPQHTVSFTCESHGFSPRDITLKWFKNGNELSDFQTNVDPVGESVSYSIHSTAKVVLTREDVHSQVICEVAHVTLQGDPLRGTANLSETIRVPPTLEVTQQPVRAENQVNVTCQVRKFYPQRLQLTWLENGNVSRTETASTVTENKDGTYNWMSWLLVNVSAHRDDVKLTCQVEHDGQPAVSKSHDLKVSAHPKEQGSNTAAENTGSNERHHHHHH

Yes

Yes