Recombinant Human CD33 Protein, C-His (HB185011)

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Overview

Catalog No.	HB185011
Description	Recombinant Human CD33 Protein, C-His (HB185011) expressed in Mammalian Cells, spanning Met1-His259. Purity: >90% by SDS-PAGE. Highlights ●His-Tagged — N-terminal 6×His tag for IMAC purification. ●Mammalian Expression — Proper folding and native glycosylation. ●High Purity — >90% purity verified by SDS-PAGE.
Expression system	Mammalian Cells
Accession	P20138
Protein length	Met1-His259
Applications	ELISA, Immunogen, SDS-PAGE, WB, Bioactivity testing in progress
Species	Homo sapiens (Human)
Nature	Recombinant
Endotoxin level	Please contact with the lab for this information.
Purity	>90% as determined by SDS-PAGE.
Predicted molecular weight	29.61 kDa
Form	Lyophilized
Storage buffer	Lyophilized from a solution in PBS pH 7.4, 1 mM EDTA, 4% Trehalose, 1% Mannitol. Please refer to the specific buffer information in the hardcopy of datasheet or the lot-specific COA.
Reconstitution	Reconstitute in sterile water for a stock solution. Adjust the volume of sterile water so that, after reconstitution, the final stock concentration matches the value indicated on the product label or datasheet. RECONSTITUTION PROTOCOL 1. Allow the product to be reconstituted and the reconstitution diluent to reach room temperature. 2. Tap or briefly centrifuge the product vial before opening to dislodge any lyophilized material that may be dispersed on the wall or cap of the vial. 3. Use the diluent and stock concentration recommended in the product datasheet. If preparing a stock concentration higher than recommended, contact Technical Service. 4. After adding the diluent, re-cap the vial and invert gently by hand or place on a slow rocking platform to allow the reconstitution diluent to coat all the surfaces inside the vial. Note: Do not mix by vortexing or by pipetting the material up and down. 5. Allow the vial to sit at room temperature with gentle agitation for at least 15 minutes before aliquotting or using. 6. Store the reconstituted material in single use aliquots in polypropylene or siliconized tubes. Aliquots of 10 μL or larger are recommended.
Shipping	In general, proteins are provided as lyophilized powder/frozen liquid. They are shipped out with dry ice/blue ice unless customers require otherwise.
Stability and Storage	Use a manual defrost freezer and avoid repeated freeze thaw cycles. Store at 2 to 8°C for frequent use. Store at -20 to -80°C for twelve months from the date of receipt.
Alternate Names	Myeloid cell surface antigen CD33, Sialic acid-binding Ig-like lectin 3, Siglec-3, CD33, gp67, SIGLEC3
Background	Myeloid cell surface antigen CD33 is a ~39 kDa protein. Sialic-acid-binding immunoglobulin-like lectin (Siglec) that plays a role in mediating cell-cell interactions and in maintaining immune cells in a resting state. Preferentially recognizes and binds alpha-2,3- and more avidly alpha-2,6-linked sialic acid-bearing glycans. Upon engagement of ligands such as C1q or syalylated glycoproteins, two immunoreceptor tyrosine-based inhibitory motifs (ITIMs) located in CD33 cytoplasmic tail are phosphorylated by Src-like kinases such as LCK. These phosphorylations provide docking sites for the recruitment and activation of protein-tyrosine phosphatases PTPN6/SHP-1 and PTPN11/SHP-2. In turn, these phosphatases regulate downstream pathways through dephosphorylation of signaling molecules. CD33 is the therapeutic target of gemtuzumab ozogamicin (Mylotarg). 1. Vitale, C. et al. (1999) Proceedings of the National Academy of Sciences of the United States of America 96, 15091-6. PMID: 10611343 2. Vitale, C. et al. (2001) Proceedings of the National Academy of Sciences of the United States of America 98, 5764-9. PMID: 11320212 3. Lajaunias, F. et al. (2005) European journal of immunology 35, 243-51. PMID: 15597323 4. Freeman, SD. et al. (1995) Blood 85, 2005-12. PMID: 7718872 5. Paul, SP. et al. (2000) Blood 96, 483-90. PMID: 10887109 6. Son, M. et al. (2017) Scientific reports 7, 270. PMID: 28325905 7. Taylor, VC. et al. (1999) The Journal of biological chemistry 274, 11505-12. PMID: 10206955 8. Ulyanova, T. et al. (1999) European journal of immunology 29, 3440-9. PMID: 10556798
Note	For research use only.

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SDS-PAGE

SDS-PAGE for Recombinant Human CD33 Protein, C-His
Bioactivity

Detects Lintuzumab in indirect ELISAs.
Bioactivity

Detected by Research Grade Vadastuximab (Cat No.: HB185036) in indirect ELISA.
Bioactivity

Detected by Research Grade Anti-Human CD33 (BI 836858) (Catalog No: HB185076) in indirect ELISA
Bioactivity

Detected by SAA2052 (Catalog No: HB185013) in indirect ELISA.
Bioactivity

Detected by Avitotamig (Catalog No: HB185096) in indirect ELISA.