Figure 4. Mutation of the O-fucosylation site on C45 muscle agrin stimulates AChR clustering.
(A) 1nM FLAG-tagged C45(z8), C45(z8)S1726A, C45(z0), or c45(z0)S1726A were assayed for AChR clustering on C2C12 myotubes by staining with rhodamine-α-bungarotoxin. Bar is 50µm. (B) C45(z0)S1726A, C45(z8), and C45(z8)S1726A agrin showed similar concentration curves for the induction of AChR clustering, while C45(z0) agrin had no activity. Errors are SEM for n=6 experiments.