Anti-Phospho-EGFR (T669) Polyclonal Antibody for WB, IP, ELISA - P00533

Core Product Specifications and Parameters

Biological Background: EGFR Function and Localization

• EGFR is a receptor tyrosine kinase that binds EGF family ligands (EGF, TGFA, AREG, etc.), triggering receptor homo- or heterodimerization and autophosphorylation on key cytoplasmic residues, thereby initiating multiple signaling cascades. Related references: PMID:10805725, PMID:27153536, PMID:2790960, PMID:12297049, PMID:15611079, PMID:17909029
• Autophosphorylated EGFR recruits adapter proteins like GRB2, activating at least four major downstream pathways: RAS-RAF-MEK-ERK, PI3K-AKT, PLCgamma-PKC, and STAT modules, which regulate cell proliferation, survival, and migration. Related references: PMID:27153536
• EGFR directly phosphorylates other signaling proteins, such as RGS16 (activating its GTPase activity) and MUC1 (increasing its interaction with SRC and beta-catenin), thereby coupling to G protein-coupled receptor signaling and cell adhesion processes. Related references: PMID:11602604, PMID:11483589
• Phosphorylation at threonine 669 (T669) is a critical regulatory event that modulates EGFR kinase activity and downstream signaling, often associated with receptor activation and signal transduction.
• Isoform 2 of EGFR may function as a natural antagonist of EGF action, providing an additional layer of signaling regulation.
• EGFR is also exploited as a host cell receptor for hepatitis C virus entry, facilitating the formation of CD81-CLDN1 receptor complexes.
• Subcellularly, EGFR is localized at the cell membrane, endoplasmic reticulum, Golgi apparatus, nucleus, and endosomes, with trafficking between compartments influencing signaling output.

Experimental Guidance and Technical Tips

• The immunogen is a synthetic phosphopeptide around T669; to confirm phosphorylation specificity, treat samples with lambda phosphatase and observe signal loss in Western blot.
• For WB, consider using a high-quality protein ladder in the 130-140 kDa range and include appropriate loading controls. Validate the antibody in your target cell line with known EGFR expression.
• In IP experiments, optimize antibody-to-lysate ratio and confirm successful immunoprecipitation via co-immunoprecipitation of known EGFR interactors or by blotting with a pan-EGFR antibody.
• ELISA protocols may require coating with the phosphorylated peptide or full-length protein; perform checkerboard titrations to determine optimal antibody and antigen concentrations.
• Cross-reactivity is limited to human EGFR; if working with mouse or rat samples, validate cross-reactivity experimentally or consider species-specific reagents.
• As a rabbit polyclonal antibody, use an appropriate anti-rabbit secondary antibody for detection; note that polyclonal lots may vary, so titrate each new lot.

CamelBio: Your One-Stop Sourcing Bridge

CamelBio is a trusted one-stop sourcing partner for IVD raw materials, providing validated antibodies, antigens, and ancillary reagents to support oncology and signaling research. This anti-Phospho-EGFR-T669 polyclonal antibody exemplifies our commitment to delivering high-quality phospho-specific tools for studying EGFR-driven signaling pathways. From bulk custom antibodies to rare target sourcing, CamelBio accelerates your diagnostic development from concept to clinic.