TY - JOUR
T1 - Liposome solubilization and membrane protein reconstitution using Chaps and Chapso
AU - Cladera, J.
AU - Rigaud, J. L.
AU - Villaverde, J.
AU - Dunach, M.
PY - 1997/1/1
Y1 - 1997/1/1
N2 - The processes of liposome solubilization and reconstitution of two transport proteins have been studied using Chaps and Chapso (3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate). The solubilization of unilamellar liposomes was followed by absorption experiments and the process was shown to fit well to the three-stage model previously proposed for other detergents. The solubilization parameters have been determined and the detergent to phospholipid ratios at which the lamellar to-micellar transition initiates and ends were estimated to be 0.21 mol/mol and 0.74 mol/mol, for Chapso and 0.4 mol/mol and 1.04 mol/mol for Chaps, respectively. The best conditions for the incorporation of two membrane proteins, bacteriorhodopsin and the H+ ATP-synthase from chloroplasts, were analyzed at process. After detergent removal, the activities of the resulting proteoliposomes were measured indicating that the most efficient reconstitutions were obtained by addition of the proteins to completely solubilized lipid-detergent micelles. The use of Chapso and Chaps for membrane protein reconstitution studies provides a reproducible method of achieving active proteoliposomes, homogeneous in size, with a low permeability and thus, well suited for transport measurements.
AB - The processes of liposome solubilization and reconstitution of two transport proteins have been studied using Chaps and Chapso (3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate). The solubilization of unilamellar liposomes was followed by absorption experiments and the process was shown to fit well to the three-stage model previously proposed for other detergents. The solubilization parameters have been determined and the detergent to phospholipid ratios at which the lamellar to-micellar transition initiates and ends were estimated to be 0.21 mol/mol and 0.74 mol/mol, for Chapso and 0.4 mol/mol and 1.04 mol/mol for Chaps, respectively. The best conditions for the incorporation of two membrane proteins, bacteriorhodopsin and the H+ ATP-synthase from chloroplasts, were analyzed at process. After detergent removal, the activities of the resulting proteoliposomes were measured indicating that the most efficient reconstitutions were obtained by addition of the proteins to completely solubilized lipid-detergent micelles. The use of Chapso and Chaps for membrane protein reconstitution studies provides a reproducible method of achieving active proteoliposomes, homogeneous in size, with a low permeability and thus, well suited for transport measurements.
KW - 3-[(3-chloamidopropyl)dimethylammonio]-2-hydroxy-1- propanesulfonate (Chapso)
KW - Chaps
KW - Proteoliposome
KW - Reconstitution
U2 - 10.1111/j.1432-1033.1997.00798.x
DO - 10.1111/j.1432-1033.1997.00798.x
M3 - Article
SN - 0014-2956
VL - 243
SP - 798
EP - 804
JO - European Journal of Biochemistry
JF - European Journal of Biochemistry
IS - 3
ER -