Platelet derived growth factor (PDGF) family proteins exist as several disulphide-bonded, dimeric isoforms (PDGF AA, PDGF AB, PDGF BB, PDGF CC, and PDGF DD) that bind in a specific pattern to two closely related receptor tyrosine kinases, PDGF receptor alpha (PDGFRalpha) and PDGF receptor beta (PDGFRbeta). PDGFRalpha and PDGFRbeta share 75% to 85% sequence homology between their two intracellular kinase domains, while the kinase insert and carboxy-terminal tail regions display a lower level (27% to 28%) of homology. PDGFRalpha homodimers bind all PDGF isoforms except those containing PDGF D. PDGFRbeta homodimers bind PDGF BB and DD isoforms, as well as the PDGF AB heterodimer. The heteromeric PDGF receptor alpha/beta binds PDGF B, C, and D homodimers, as well as the PDGF AB heterodimer. PDGFRalpha and PDGFRbeta can each form heterodimers with EGFR, which is also activated by PDGF. Various cells differ in the total number of receptors present and in the receptor subunit composition, which may account for responsive differences among cell types to PDGF binding. Ligand binding induces receptor dimerization and autophosphorylation, followed by binding and activation of cytoplasmic SH2 domain-containing signal transduction molecules, such as GRB2, Src, GAP, PI3 kinase, PLCgamma, and NCK. A number of different signaling pathways are initiated by activated PDGF receptors and lead to control of cell growth, actin reorganization, migration, and differentiation. Tyr751 in the kinase-insert region of PDGFRbeta is the docking site for PI3 kinase. Phosphorylated pentapeptides derived from Tyr751 of PDGFRbeta (pTyr751-Val-Pro-Met-Leu) inhibit the association of the carboxy-terminal SH2 domain of the p85 subunit of PI3 kinase with PDGFRbeta. Tyr740 is also required for PDGFRbeta-mediated PI3 kinase activation.
Specificity:Human
Intended Use:The PDGF Receptor beta Antibody Sampler BioAssay™ Kit provides a fast and economical means of evaluating levels of total PDGF receptor. The kit contains enough primary and secondary antibody to perform two Western blot experiments per antibody.
Applications:Suitable for use in Western Blot. Other applications not tested.
Recommended Dilution:Western Blot: 1:500-1:2000Optimal dilutions to be determined by the researcher.
Storage and Stability:May be stored at 4°C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
