Keywords: پروتئین اتصال GTP; Septin; Protein-protein interaction; Protein-lipid interaction; GTP binding protein; CD; Circular dichroism; CSM; Center of spectral mass; DOPC; 1,2-Dioleoyl-sn-glycero-3-phosphocholine; GUV; Giant unilamelar vesicle; ITC; Isothermal titration calorimetry