title: Fluorescence of 1,8-anilinonaphthalene sulfonic acid bound to proteins and to lipids of sarcolemma.
abstract: Relative contributions to fluorescnece of 1,8-anilinonaphthalene sulfonic acid-sarcolemma by 1,8-anilinonaphthalene sulfonic acid bound to proteins and to lipid were assessed on the basis of fluorescence lifetime and steady-state emission spectra. The lifetime spectrum of lipid-poor proteins prepared from sarcolemma had a major time constant of 16 ns; that of lipids extracted from sarcolemma had a major time constant of 7 ns and a minor one of 4 ns. In sarcolemma, components having all three time constants were observed with weighting factors 0.33, 0.6 and 0.07, respectively, indicating the fraction of 1,8-anilinonaphthalene sulfonic acid bound to protein and to lipid. Steady-state emission spectra of 1,8-anilinonaphthalene sulfonic acid-sarcolemma were resolved into and resynthesized from contributions by 1,8-anilinonaphthalene sulfonic acid bound to proteins and to lipids. The latter was at least two thirds of total 1,8-anilinonaphthalene sulfonic acid bound. Results of analyses of spectra obtained with various concentrations of sarcolemma and 1,8-anilinonaphthalene sulfonic acid suggest that the proteins have a higher affinity, but only about half the binding capacity for 1,8-anilinonaphthalene sulfonic acid as do lipids.
mesh_terms: D000817:Anilino Naphthalenesulfonates; D000818:Animals; D002462:Cell Membrane / Q000032:analysis; D007700:Kinetics; D008297:Male; D008433:Mathematics; D008563:Membrane Lipids; D008565:Membrane Proteins; D008968:Molecular Conformation; D009124:Muscle Proteins; D009132:Muscles / Q000032:analysis; D011487:Protein Conformation; D051381:Rats; D012508:Sarcolemma / Q000032:analysis*; D012710:Serum Albumin, Bovine; D013050:Spectrometry, Fluorescence
chemical_list: D000817:Anilino Naphthalenesulfonates; D008563:Membrane Lipids; D008565:Membrane Proteins; D009124:Muscle Proteins; D012710:Serum Albumin, Bovine