Sheep anti Human PTP (HCPTP)Catalog number: P240P
Low molecular weight protein tyrosine phosphtases, including the human red cell phosphatase, HCPTP, are widely expressed cytosolic proteins of approximately 18kDa that exist in distinct isoforms and are highly selective for phosphotyrosine over phosphoserine or phosphotyrosine. The HCPTP-A and HCPTP-B proteins expressed in human red cells and placenta are fast and slow forms of red cell acid phosphatase5. Like other tyrosine phosphatases, HCPTP is sensitive to inhibition by vanadate, and has a catalytic mechanism that involves formation of a cystinyl-phosphate intermediate6. The crystal structure of the bovine heart derived enzyme BHPTP shows a four-stranded central parallel b sheet with flanking a helices and an active site cysteine residue in the typical tyrosine phosphatase sequence context, CXXXXXR.Biological actions and cellular substrates have not been fully elucidated. It is expressed in a wide range of cell types, and structural homologues are expressed in yeast. A catalytically inactive LMW-PTP functions to promote cell division and binds to tyrosine-phosphorylated PDGF receptors1. The HCPTPA isoform interacts with receptor tyrosine kinases, EphB1 and VEGFR2 (flk-1)2,4. Its overexpression inhibits VEGF-induced endothelial proliferation and migration, and its recruitment to EphB1 complexes is crucial to downstream signaling between EphB1 and integrins that mediate cell-matrix attachment3.
Synonyms: lmwPTP, sheep anti human low molecular weight protein tyrosine phosphatase, Human Red Cell Protein Tyrosine phosphatase
Immunogen: The human protein, HCPTPA (GB Accession #M83653) was subcloned into pRSET to express a His6 N terminal fusion protein. This protein was expressed in E. coli and purified to homogeneity on Ni affinity matrix.
Product Form: Unconjugated
Formulation: Provided as solution in phosphate buffered saline with 0.08% sodium azide
Purification Method: Ammonium Sulfate Precipitation
Concentration: See vial for concentration
Antbibody can be used for Western blotting and immunoprecipitation (1-10µg/ml. Optimal concentration should be evaluated by serial dilutions.
Functional Analysis: Western Blotting
Product should be stored at -20°C. Aliquot to avoid freeze/thaw cycles
Product Stability: See expiration date on vial
Shipping Conditions: Ship at ambient temperature, freeze upon arrival
This product is intended FOR RESEARCH USE ONLY, and FOR TESTS IN VITRO, not for use in diagnostic or therapeutic procedures involving humans or animals. It may contain hazardous ingredients. Please refer to the Safety Data Sheets (SDS) for additional information and proper handling procedures. Dispose product remainders according to local regulations.This datasheet is as accurate as reasonably achievable, but Exalpha Biologicals accepts no liability for any inaccuracies or omissions in this information.
1. Chiarugi, P., Cirri, P., Raugei, G., Camici, G., Dolfi, F., Berti, A., and Ramponi, G. (1995). PDGF receptor as a specific in vivo target for low M(r) protein tyrosine phosphatase. FEBS Letters 372, 49-53. 2. Huang, L., Sankar, S., Lin, C., Kontos, C.D., Schroff, A.D., Cha, E.H., Feng, S.M., Li, S.F., Yu, Z., Van Etten, R.L., Blanar, M.A., and Peters, K.G. (1999). HCPTPA, a Protein Tyrosine Phosphatase That Regulates Vascular Endothelial Growth Factor Receptor-mediated Signal Transduction and Biological Activity. J.Biol.Chem. 274, 38183-38188. 3. Huynh-Do, U., Stein, E., Lane, A.A., Liu, H., Cerretti, D.P., and Daniel, T.O. (1999). Surface densities of ephrin-B1 determine EphB1-coupled activation of cell attachment through alphavbeta3 and alpha5beta1 integrins. EMBO J. 18, 2165-2173. 4. Stein, E., Lane, A.A., Cerretti, D.P., Schoecklmann, H.O., Schroff, A.D., Van Etten, R.L., and Daniel, T.O. (1998). Eph receptors discriminate specific ligand oligomers to determine alternative signaling complexes, attachment, and assembly responses. Genes Dev. 12, 667-678. 5. Wo, Y.-Y., McCormack, A.L., Shabanowitz, J., Hunt, D.F., Davis, J.P., Mitchell, G.L., and Van Etten, R.L. (1992). Sequencing, cloning, and expression of human red cell-type acid phosphatase, a cytoplasmic phosphotyrosyl protein phosphatase. J Biol Chem 267, 10856-10865. 6. Zhang, M., Stauffacher, C.V., and VanEtten, R.L. (1995). The three dimensional structure, chemical mechanism and function of the low molecular weight protein tyrosine phosphatases. Adv.Prot.Phosphatases 9, 1-23.
Database Name: UniProt
Accession Number: P24666 (Human)Q9D358 (Mouse)P41498 (Rat)P11064
Species Accession: Human, Rat, Mouse, Bovine
Safety Datasheet(s) for this product:
"CHO cells were transfected with either Vector (pSRa) or expression vector driving expression of HCPTPA (pSRa-LMWPTP), and harvested in Triton X-100 lysis buffer at 72 h after transfection. 2mg of lysate protein was incubated for 1 h with 10ml of sheep-anti-LMWPTP containing anti-serum, and immuno-precipitated proteins recovered by Protein A/G were separated on PAGE (12%), and HCPTPA detected using a mouse anti-sheep monoclonal antibody (Cat # X1206M)."