CD34 is a single­pass, type I transmembrane protein belonging to the CD34 family that includes Podocalyxin, and Endoglycan. CD34 is a well-known hematopoietic progenitor cell antigen. It is a sialomucin­like molecule that is heavily glycosylated with 9 potential N-linked glycosylation sites in the extracellular domain.  In the cytoplasmic region, CD34 contains serine residues that can be phosphorylated by PKC (protein kinase C), resulting in the recruitment of the hematopoietic adapter proteins and the activation of CD34 signaling pathways. CD34 is expressed on primitive hematopoietic stem cells and down-regulated as they differentiate into mature cells. The precise function of CD34 remains unclear.  The pattern of CD34 expression suggests that it plays an important role in hematopoiesis. CD34 is found on multipotent precursors, bone marrow stromal cells, embryonic fibroblasts, vascular endothelia, mesenchymal stem cells, and some tumor cell lines. CD34 is involved in the adhesion of stem cells to the bone marrow extracellular matrix or to stromal cells. It can act as a scaffold for the attachment of lineage specific glycans, allowing stem cells to bind to lectins expressed by stromal cells or other marrow components. CD34 is overexpressed in many types of tumors and implicated in leukemogenesis.

CD34 is a single­pass, type I transmembrane protein belonging to the CD34 family that includes Podocalyxin, and Endoglycan. CD34 is a well-known hematopoietic progenitor cell antigen. It is a sialomucin­like molecule that is heavily glycosylated with 9 potential N-linked glycosylation sites in the extracellular domain.  In the cytoplasmic region, CD34 contains serine residues that can be phosphorylated by PKC (protein kinase C), resulting in the recruitment of the hematopoietic adapter proteins and the activation of CD34 signaling pathways. CD34 is expressed on primitive hematopoietic stem cells and down-regulated as they differentiate into mature cells. The precise function of CD34 remains unclear.  The pattern of CD34 expression suggests that it plays an important role in hematopoiesis. CD34 is found on multipotent precursors, bone marrow stromal cells, embryonic fibroblasts, vascular endothelia, mesenchymal stem cells, and some tumor cell lines. CD34 is involved in the adhesion of stem cells to the bone marrow extracellular matrix or to stromal cells. It can act as a scaffold for the attachment of lineage specific glycans, allowing stem cells to bind to lectins expressed by stromal cells or other marrow components. CD34 is overexpressed in many types of tumors and implicated in leukemogenesis.

 

Product Details

 

Gene Symbol: CD34

 

NCBI Gene ID: 947

 

Uniprot Entry: P28906

 

Construct Details: Expressed as the combination of a heavy chain (HC) containing VH from anti-CD34 mAb and CH1-3 region of human IgG1 and a light chain (LC) encoding VL from anti-CD34 mAb and CL of human kappa light chain.  Exists as a disulfide linked dimer of the HC and LC hetero-dimer under non-reducing condition.

 

Source: Mammalian cells stably expressing anti-CD34 heavy chain and light chain (in human IgG1k format) and growing in chemical-defined media with no animal components. 

 

M.W.: Calculated molecular mass (kDa): 147 (49 kDa for a single HC, 24.5 kDa for a single LC); Estimated by SDS-PAGE under non-reducing condition(kDa): 150

 

Purity: >95% judged by SDS-PAGE under reducing condition (see the gel image above, labeled as DTT "+")

 

Formulation: Supplied at 1.0 mg/ml in sterile PBS pH7.4 without any carrier protein or preservative (the concentration determined by UV absorption with an A280nm of 1.0 for 0.73 mg/ml of IgG and verified by SDS-PAGE and Coomassie blue staining)

 

Endotoxin Level: <0.1 EU per 1 μg of purified recombinant protein determined by the LAL method

 

Biological Activity: Binds the immobilized CD34 ECD protein (SKU#FCL1678) with high affinity (K_D < 10 nM) by ELISA (see Technical Data).  Has the same binding specificity as anti-CD34 monoclonal antibodies, rabbit IgG (SKU#MAB1713) and mouse IgG2a (SKU#MAB1678).  Recognizes cell surface CTLA4 by flow cytometry/FACS, IHC staining and fluorescent microscopy. 

 

 

  

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

Restriction: This product is not transferable or re-sellable.  Customer obtain no right to transfer, assign, or sublicense its use rights, or to transfer, resell, package, or otherwise distribute the product, or to use the product for the benefit of any third party or for any commercial purpose.  Customer may only use the product in compliance with applicable local, state and federal laws, regulations and rules.  Customer may not directly or indirectly use the product or allow the transfer, transmission, export or re-export of all or any part of the product in violation of any export control law or regulation of the united states or any other relevant jurisdiction.  Your use of this product constitutes acceptance of the terms of this limited use agreement.  Please refer to our “terms & conditions” for details.  If you are not willing to accept the limitation of this agreement, G&P Biosciences will accept return of the product for a full/partial refund.

 

Technical Data

 

Recombinant CD34 ECD protein (SKU#FCL1678) was immobilized at 100 ng/well on a 96-well NuncMaxisorp plate for an ELISA with serially diluted anti-CD34 monoclonal antibody (SKU#MAB0820). Anti-CD3e (SKU#MAB0818) monoclonal antibody was used as a negative control to demonstrate the specificity of CD34 binding under the experimental conditions.  The binding curve was fit and apparent K_D was calculated for anti-CD34: CD34 binding to be 3.0 ± 0.4 nM.   

 

 

 

  

 

 FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

 

Storage

 

The product is shipped at 4°C. Upon receipt, centrifuge the product briefly before opening the vial. It is recommended to store small aliquots at the temperature below –20°C for long-term storage and the product is stable for 3 months. The undiluted protein can be stored at 4°C for no more than 2 weeks.

 

 

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.

 

 

 

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

 

References

 

1. Leukemia 2:793-803(1988).

2. J. Biol. Chem. 265:11056-61 (1990).

3. J. Immunol. 148:267-271(1992)

4. Blood 80:3051-59 (1992).

5. Blood 95:756-768 (2000).

 

 

Documentation

 

Product datasheet (pdf) can be downloaded here: MAB0820-PDS.pdf

 

 

 

Additional supporting documents, including COA and MSDS are available upon request.

 

 

 

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

Restriction: This product is not transferable or re-sellable.  Customer obtain no right to transfer, assign, or sublicense its use rights, or to transfer, resell, package, or otherwise distribute the product, or to use the product for the benefit of any third party or for any commercial purpose.  Customer may only use the product in compliance with applicable local, state and federal laws, regulations and rules.  Customer may not directly or indirectly use the product or allow the transfer, transmission, export or re-export of all or any part of the product in violation of any export control law or regulation of the united states or any other relevant jurisdiction.  Your use of this product constitutes acceptance of the terms of this limited use agreement.  Please refer to our “terms & conditions” for details.  If you are not willing to accept the limitation of this agreement, G&P Biosciences will accept return of the product for a full/partial refund.