Binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and __SP__ __NODE__ protein(s) in a system of purified components is the same as binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and mutant __SP__ __NODE__ protein(s) ( K20E ) in a system of purified components .