Figure 1.


Neutrophil plasma membranes are highly enriched in p205. Fractions highly enriched in plasma membranes (A) or secretory vesicles (B) were analyzed for the presence of p205 by F-actin blot overlay (C). Aliquots (100 μg protein) were fractionated on a 5% SDS–polyacrylamide gel, transferred to nitrocellulose, and then probed with 125I-labeled F-actin. Lane 1, plasma membranes; lane 2, secretory vesicles; and lane 3, cytosol. E/M, the position of ezrin and moesin. Other cytosolic actin-binding proteins also are detected by this method (lane 3).