Phospholipid-binding activity of human mannan-binding lectin

Some C-type lectins possess phospholipid-binding ability, which may be of physiological importance. Human mannan-binding lectin (MBL) was found to bind specifically to solid-phase phosphatidylserine (PS), phosphatidylinositol (PI) and phosphatidylcholine (PC), but not cardiolipin (CL), in a concentration-dependent manner. This property was inhibited by EDTA and by monosaccharides, and exhibited a similar pH dependence to the carbohydrate (mannan)-binding activity of MBL. These findings may be of immunological relevance.