Fig. 5.
Lipids in the Stv1-VO map. (A) Stv1-VO map with densities corresponding to protein (gray) and a ring of densities around the luminal region of the c-ring, possibly corresponding to ergosterol or diosgenin, the sterol-like moiety of GDN (blue); unidentified regularly spaced densities are also seen around the cytosolic region of the c-ring (red). (B) Bound phospholipids around subunit a, modeled with phosphatidylcholine (red). (C) An unidentified density (yellow) is seen in the Stv1-VO map; also seen are phospholipids in the center of the c-ring (red). (Scale bar, 25 Å.)