Binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and mutant __SP__ __NODE__ protein(s) ( F3W ) in a system of purified components is greater than binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and mutant __SP__ __NODE__ protein(s) ( C69W ) in a system of purified components .