CD22 Protein, Rhesus Macaque (HEK293, His)

The Siglec-2/CD22 protein mediates B cell interactions and may direct B cell localization within lymphoid tissues. It recognizes sialylated glycoproteins, especially α-2,6-linked sialic acid, and participates in cis-interactions at the cell surface. CD22 Protein, Rhesus Macaque (HEK293, His) is the recombinant Rhesus Macaque-derived CD22 protein, expressed by HEK293 , with C-His labeled tag.

Siglec-2/CD22 Protein serves as a crucial mediator in B-cell interactions, potentially playing a role in the localization of B-cells within lymphoid tissues. Known for its ability to bind sialylated glycoproteins, including CD45, it exhibits a preference for alpha-2,6-linked sialic acid. The sialic acid recognition site may be masked by cis interactions with sialic acids on the same cell surface. During the immune response, ligand-induced tyrosine phosphorylation suggests its involvement in the regulation of B-cell antigen receptor signaling. The protein's multifaceted role encompasses positive regulation through interaction with Src family tyrosine kinases, while concurrently acting as an inhibitory receptor by recruiting cytoplasmic phosphatases via their SH2 domains to block signal transduction through dephosphorylation of signaling molecules. Siglec-2/CD22 predominately exists as a monomer of isoform CD22-beta and can also form a heterodimer with a shorter isoform. Its intricate interactions with key molecules such as PTPN6/SHP-1, LYN, SYK, PIK3R1/PIK3R2, PLCG1, GRB2, INPP5D, and SHC1, especially upon phosphorylation, highlight its pivotal role in orchestrating complex signaling networks within B-cells. Further research is essential to unravel the precise molecular pathways and functional consequences of Siglec-2/CD22 in B-cell regulation and immune responses.

Determined by its ability to inhibit the proliferation of Raji cells. The ED₅₀ for this effect is 9.78 μg/mL, corresponding to a specific activity is 1.02×10² units/mg.

Rhesus Macaque

HEK293

C-His

EHH29920 (S20-R686)

/

SKWNIEHPGTIYAWEGACVWVPCTYRVLDGALETFILFHNPEYNQNMSKFEGTRLYESTKDGKVPSGQKRVQFLGNKINNNCTLSIHPVHVNDSGQLGLRMVSKTEKWMERIHLNVSERPFPPRIQLPPKLQESQEVTLTCLLNFSCYGYQIQLQWLLEGVPMRQAAVTSTSLSTKSVFTRSELKFSPQWSHHGKIVTCELHDVDGKVLSEDMVQLNVKHTPKLTIEVTPNETIVRKGDSVTMTCKVNSSNPEYTTVSWLKDGIPLKEQNTLMLTLHEVTKSQSGRYCCRVSNDVGPATSEKVFLQVQYAPEPSRVQISQSPAVEGSEVNFLCISPANPLPTNYTWYHNGKEVQGRTEKQFQIQKILPWHAGTYSCEAENILGIGERGPGTELDVQYPPKKVTMVIENPTPIREGDTVTLSCNYSSSNPIVNHYEWRPRGAWEEPSLGVLKIQNIGWNNTAVACAACNNWCSWASPVTLNVLYAPRGVRVRKIKPLSEIHSGNSVSLQCDFSSSHPKEVQFFWEKNGSLLGKESQLNFDSISPEDAGSYSCWVNNSIGQTASKAWTLEVLYAPRRLRVSMSQGNQVMEGKTATLICESDANPPVYSYAWFDWNNQSLPYSGRMLRLEPVKVQHSGAYWCQGTNRVGKGHSPLITLTVYYSPQTIGRR

Approximately 100-130 kDa due to the glycosylation.

Greater than 90% as determined by reducing SDS-PAGE.

Lyophilized powder.

Lyophilized from a 0.2 μm filtered solution of PBS, pH 7.4.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.