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Rapid isolation of plasmalemma from cultured A431 cells: characterization of epidermal growth factor receptors
P H Lin1, R H Selinfreund, E Wakshull
1University of California Experimental Pathology Group, Los Alamos National Laboratory, New Mexico 87545.
Abstract:
A rapid method for the purification of plasma membrane from a relatively small number of A431 cells is described. The method is a simple, two-step differential centrifugation in the presence of Ca2+ that requires a total centrifugation time of 7 min. The membrane preparations contained a high level of epidermal growth factor (EGF) receptor activity demonstrated by both the quantity of specific ligand binding and the amount of EGF-dependent phosphorylation of the receptor and an exogenous substrate. EGF-dependent autophosphorylation identified the EGF receptor in the purified membranes as an undegraded 170-kDa protein.