Title

Translocation of PLC-Γ to the Plasma Membrane Caused By Truncated Tyrosine Kinases

Document Type

Article

Publication Date

12-1-2001

Abstract

PLC-γ activation correlates with PLC-γ tyrosine phosphorylation, association of PLC-γ with the EGF receptor and translocation of PLC-γ from the cytosol to the membrane. PLC-γ association with the EGF receptor and tyrosine phosphorylation of PLC-γ are required for activity. However, the importance and mechanism of PLC-γ translocation to the membrane for PIP 2 breakdown is unknown. PLC-γ translocation was studied in cell lines containing EGF receptor mutants that were unable to activate PLC-γ or associate with PLC-γ but were still capable of phosphorylating PLC-γ. Kinase active receptors which were unable to activate PLC-γ were still able to induce translocation of PLC-γ from the cytoplasm. Both wild type and autophosphorylation deficient receptors showed equivalent translocation with increasing EGF. Transport of PLC-γ from the cytosol was disrupted with triton X-100 suggesting that PLC-γ is associated with the membrane and not the cytoskeleton.

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