Liposome (2 mM total lipids) compositions are indicated in the figures or legends. Liposomes were incubated with 10 μM proteins (±Ca2+) in buffer A (unless stated otherwise) for 40 min at room temperature. The liposomes and bound proteins were isolated by flotation on a Histodenz (Sigma Aldrich) density gradients (40%:30%) using a SW 55 Ti rotor (Beckman Coulter; Boulevard Brea, CA) at 163,000 ×g for 40 min. Samples from the top and the bottom of the gradient (20 μl) were taken and analyzed by SDS-PAGE and Coomassie Brilliant Blue (CBB) staining.
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