NON-DETERGENT SULFOBETAINES - A NEW CLASS OF MILD SOLUBILIZATION AGENTS FOR PROTEIN-PURIFICATION

The action of non-detergent sulphobetaines (NDSBs) as new mild agents for protein purification is described. The solubilization effects of n on-detergent sulphobetaines are shown in different examples, all obtai ned under non-denaturing conditions: (1) microsomal proteins extractio n; (2) recovery after dialysis of nuclear proteins; (3) reduction of p recipitation in isoelectric focusing experiments under non-denaturing conditions; and (4) purification of a membrane-bound serine protease f rom Plasmodium falciparum involved in erythrocyte invasion by malaria merozoites. The absence of a significant denaturation effect induced b y NDSBs is demonstrated by test on beta-galactosidase and alkaline pho sphatase. A simple NDSB synthesis and some possible explanations of th e action of NDSBs are also presented.