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Interaction of very low density lipoprotein with chicken oocyte membranes

The interaction of hen 125I‐VLDL (very low density lipoprotein) with chicken oocyte membranes was characterized using a rapid sedimentation assay. Equilibrium and kinetic studies showed an apparent dissociation constant (Kd) 8.7–9.1 × 10‐8 M or 43.5–45.5 μg VLDL protein/ml. Binding capacity was 2.0 μg VLDL protein/mg membrane homogenate protein. The apparent rate constants were, k1 = 2.4 × l05 M‐1min‐1 and k2 = 2.1 × 10‐2 min‐1. Specific binding required the presence of divalent cations. Whereas binding was completely re‐stored after treatment with EDTA by the addition of Mn++, only 60% of binding was restored using Ca++.