The affinity of binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and __SP__ __NODE__ protein(s) in a system of purified components is greater than the affinity of binding of dioleoylphosphatidylglycerol in small unilamellar vesicles and mutant __SP__ __NODE__ protein(s) ( K31E ) in a system of purified components .