title: FRAP beam-size analysis to measure palmitoylation-dependent membrane association dynamics and microdomain partitioning of Ras proteins.
abstract: Motions of membrane-associated proteins within and between membranes are essential for many cellular functions. We describe the application of fluorescence recovery after photobleaching (FRAP) beam-size analysis to investigate the role of palmitoylation in the membrane targeting and membrane association dynamics of H-Ras. The method described distinguishes between FRAP by lateral diffusion and by cytoplasmic exchange, and enables to obtain an estimate of the membrane affinity in live cells. These studies show distinct roles for the two palmitoylation sites (Cys181 and Cys184) on H-Ras, with different effects on membrane affinity and microlocalization.
authors.affiliation: Department of Neurobiochemistry, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel. henis@post.tau.ac.il
authors.forename: Yoav I
authors.initials: YI
authors.lastname: Henis
authors.forename: Barak
authors.initials: B
authors.lastname: Rotblat
authors.forename: Yoel
authors.initials: Y
authors.lastname: Kloog
mesh_terms: D000215:Acylation; D000217:Acyltransferases / Q000502:physiology*; D000818:Animals; D036681:Fluorescence Recovery After Photobleaching; D006801:Humans; D021962:Membrane Microdomains / Q000378:metabolism*; D019308:Palmitic Acid / Q000378:metabolism*; D018631:ras Proteins / Q000378:metabolism*
chemical_list: D019308:Palmitic Acid; D000217:Acyltransferases; D018631:ras Proteins