FIGURE 4.

A, transparent surface of the hydrophobic crevice in rPLA₂, colored according to atom type with carbon in gray, oxygen in red, nitrogen in blue, sulfur in yellow, and Ca²⁺ in green. Side chains in are shown as sticks. The N-terminal tail from a neighboring subunit, with green carbon atoms, is packing against the opening of the crevice. B, surface of the suggested i-face of rPLA₂ viewed from the membrane and colored according to atom type with carbon in gray, oxygen in red, nitrogen in blue, sulfur in yellow, and Ca²⁺ in green. Residues suggested to reside at the interface are shown as sticks. The octanoate molecule is shown in green sticks for orientation.