Simplified equation to extract diffusion coefficients from confocal FRAP data.
Simplified equation to extract diffusion coefficients from confocal FRAP data.
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DOI:
10.1111/tra.12008
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发表时间:
2012-12
期刊:
影响因子:
--
通讯作者:
DiBenedetto E
中科院分区:
文献类型:
--
作者:
Kang M;Day CA;Kenworthy AK;DiBenedetto E
Quantitative measurements of diffusion can provide important information about how proteins and lipids interact with their environment within the cell and the effective size of the diffusing species. Confocal FRAP is one of the most widely accessible approaches to measure protein and lipid diffusion in living cells. However, straightforward approaches to quantify confocal FRAP measurements in terms of absolute diffusion coefficients are currently lacking. Here, we report a simplified equation that can be used to extract diffusion coefficients from confocal FRAP data using the half time of recovery and effective bleach radius for a circular bleach region, and validate this equation for a series of fluorescently labeled soluble and membrane-bound proteins and lipids. We show that using this approach, diffusion coefficients ranging over three orders of magnitude can be obtained from confocal FRAP measurements performed under standard imaging conditions, highlighting its broad applicability.
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