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- W2091228229 abstract "We have demonstrated that the technique of fluorescence photobleaching recovery (FPR) can be used to examine the state of a single component in complex self-assembling macromolecular systems. Polymerization of actin, initiated by addition of salt or Mg+2 to a low-ionic-strength solution of G-actin, has been observed by sequential measurement of FPR with the aid of fluorescein-labeled actin. Solutions of actin which had been labeled using 5-iodoacetamido fluorescein (5-IAF) showed anomalous recovery of fluorescence above the initial value, which indicates a photoinduced increase in local polymerization. No such anomaly was observed with actin that had been labeled with fluorescein isothiocyanate (FITC). The FPR data are directly interpretable in terms of the fraction of labeled protein that is immobilized in the supramolecular assembly and in terms of the average diffusion coefficient of the mobile fraction. Our data are consistent with the treadmill model of actin polymerization, in that they show that actin is present under polymerizing conditions either as a high polymer or as monomer or low oligomer. We believe that the FPR technique can be applied to the study of many types of reconstituted motile or cytoskeletal systems in vitro or in vivo." @default.
- W2091228229 created "2016-06-24" @default.
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- W2091228229 date "1981-08-01" @default.
- W2091228229 modified "2023-09-24" @default.
- W2091228229 title "Fluorescence photobleaching recovery in solutions of labeled actin" @default.
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- W2091228229 doi "https://doi.org/10.1016/s0006-3495(81)84794-7" @default.
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