title: Application of nonionic polyoxyethylene detergents in studies of phosphatidylinositol kinase.
abstract: Four commercial nonionic polyoxyethylene detergents were compared with Triton X-100 in terms of physicochemical properties and interaction with an integral membrane protein, phosphatidylinositol kinase. Tergitol 15-S-9, Tergitol TMN-10, polyoxyethylene 10 lauryl ether, and polyoxyethylene 10 tridecyl ether possess aliphatic hydrophobic moieties and therefore do not absorb significantly in the ultraviolet region. Like Triton X-100, these detergents have cloud points well above the physiological temperature range and partial specific volumes greater than 0.9 cm3/g. Critical micelle concentrations range from 0.02 to 0.03% with the exception of Tergitol TMN-10, for which the value is about 0.15%. All five detergents support activity of phosphatidylinositol kinase from rat liver in a mixed micellar assay and show similar ionic strength dependences for solubilization of the enzyme. Enzyme/detergent mixed micelles are somewhat smaller with Triton X-100 than for the other detergents. The data presented suggest that these detergents may be generally substituted for Triton X-100 in applications where uv invisibility is important.
authors.affiliation: Department of Biochemistry, University of Alabama, Birmingham 35294.
authors.forename: B R
authors.initials: BR
authors.lastname: Ganong
authors.forename: C M
authors.initials: CM
authors.lastname: Lu
mesh_terms: D019870:1-Phosphatidylinositol 4-Kinase; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002850:Chromatography, Gel; D003902:Detergents / Q000494:pharmacology*; D005260:Female; D066298:In Vitro Techniques; D008823:Micelles; D008862:Microsomes, Liver / Q000201:enzymology; D017830:Octoxynol; D010770:Phosphotransferases / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013501:Surface-Active Agents / Q000494:pharmacology*
chemical_list: D003902:Detergents; D008823:Micelles; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; D017830:Octoxynol; D010770:Phosphotransferases; D019870:1-Phosphatidylinositol 4-Kinase