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- W2048610003 abstract "Gelsolin regulates the dynamics of F-actin by binding to F-actin to sever and cap. In the present study, a novel approach is introduced to observe gelsolin activity through the coverage of surface-bound F-actin. Gelsolin was immobilized on streptavidin coated surface using biotinylation and, as a result, the interaction between gelsolin and F-actin was visualized. Consequently, the coverage of F-actin reflects the activity of gelsolin as a function of free Ca(2+) concentrations. In order to prevent non-specific binding of F-actin, the combinations of BSA and Tween-20 as blocking agents were investigated. Moreover, the measurement of the length of F-actin with actin-gelsolin mixtures at various ratios provided the verification of gelsolin activity after biotinylation. The data shows the increase in Ca(2+) concentration leads to a proportional increase in F-actin coverage, giving to half-maximal coverage at ~2.9 μM. Furthermore, the length of bound F-actin was found to decrease along with increasing Ca(2+) concentration, and full-length F-actin was rarely observed. This may suggest that severing and capping activities of gelsolin occur without more additional Ca(2+) for subsequent activation after full-length gelsolin binds to a side of F-actin. This finding may provide a key to understand gelsolin activity." @default.
- W2048610003 created "2016-06-24" @default.
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- W2048610003 date "2013-01-01" @default.
- W2048610003 modified "2023-09-25" @default.
- W2048610003 title "A visualized observation of calcium-dependent gelsolin activity upon the surface coverage of fluorescent-tagged actin filaments" @default.
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- W2048610003 doi "https://doi.org/10.1016/j.jcis.2012.08.049" @default.
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