Abstract

Association of phospholipase C (PLC)-γ1 with the cytoskeleton has been postulated to be one of the crucial steps for PLC-γ1 activation and translocation to the plasma membrane. In this report, direct binding assays were carried out to study which fragment of PLC-γ1 Src-homology region has been able to bind to the actin-cytoskeleton. Using GST fusion proteins containing various deletions of the PLC-γ1 Src homology region, it was found that PLC-γ1 binds to the actin-cytoskeleton directly via its C-terminal SH2 domain but not the SH3 domainin vitro.However, the binding of the C-terminal SH2 domain of PLC-γ1 to actin did not interfere with the SH2 domain's ability to associate with phosphotyrosine, which suggested that actin and phosphotyrosine residues may bind to different sequences in the C-terminal SH2 domain of PLC-γ1.

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