One likely interpretation is that HA-[C93A]Wingless does not bind Fz2 and hence cannot be internalised
One likely interpretation is that HA-[C93A]Wingless does not bind Fz2 and hence cannot be internalised. We next asked whether an conversation between Fz2 and [C93A]Wingless could be detected when these proteins are expressed in the same cells. main member of the Wnt family. Analysis of [C93A]Wingless shows that palmitoylation is essential for signalling activity (as well as in cultured cells). Moreover, without palmitate, Wingless fails to reach the surface of imaginal discs cells and, as EM analysis suggests, appears to accumulate in the ER. Artificial targeting of palmitate-deficient Wingless to the plasma membrane does not rescue signalling activity. Therefore palmitate at C93 has a dual role, in secretion and signalling. From our analysis of [S239A]Wingless, which lacks a conserved residue AIM-100 shown to be acylated in Wnt-3a, we infer that…