Abstract
Photoactivated localization microscopy (PALM) is a powerful approach for investigating protein organization, yet tools for quantitative, spatial analysis of PALM datasets are largely missing. Combining pair-correlation analysis with PALM (PC-PALM), we provide a method to analyze complex patterns of protein organization across the plasma membrane without determination of absolute protein numbers. The approach uses an algorithm to distinguish a single protein with multiple appearances from clusters of proteins. This enables quantification of different parameters of spatial organization, including the presence of protein clusters, their size, density and abundance in the plasma membrane. Using this method, we demonstrate distinct nanoscale organization of plasma-membrane proteins with different membrane anchoring and lipid partitioning characteristics in COS-7 cells, and show dramatic changes in glycosylphosphatidylinositol (GPI)-anchored protein arrangement under varying perturbations. PC-PALM is thus an effective tool with broad applicability for analysis of protein heterogeneity and function, adaptable to other single-molecule strategies.
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Acknowledgements
We thank G. Patterson (US National Institute of Biomedical Imaging and Bioengineering) for providing plasmid constructs; E. Ambroggio (US National Institute of Child Health and Development) for providing purified PAGFP protein; H. Hess and G. Stengel for providing the Peak Selector software and valuable discussion; S. Manley for help in setting up the PALM microscope; B. Baird and D. Holowka for valuable discussions. S.L.V. was supported by US National Institutes of Health grant R00GM87810.
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P.S. and T.J-T. conceived and designed experiments, developed experimental techniques, performed experiments, developed the analytical method, analyzed data and wrote the paper; D.S. helped develop the analytical method; M.R. contributed to characterization of PA-FP and imaging regime; S.L.V. contributed equations used to analyze data; J.L-S. conceived and designed the experiments, and wrote the paper.
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Sengupta, P., Jovanovic-Talisman, T., Skoko, D. et al. Probing protein heterogeneity in the plasma membrane using PALM and pair correlation analysis. Nat Methods 8, 969–975 (2011). https://doi.org/10.1038/nmeth.1704
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DOI: https://doi.org/10.1038/nmeth.1704
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