Coordinate-based co-localization-mediated analysis of arrestin clustering upon stimulation of the C–C chemokine receptor 5 with RANTES/CCL5 analogues
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G protein-coupled receptor activation and desensitization leads to recruitment of arrestin proteins from cytosolic pools to the cell membrane where they form clusters difficult to characterize due to their small size and further mediate receptor internalization. We quantitatively investigated clustering of arrestin 3 induced by potent anti-HIV analogues of the chemokine RANTES after stimulation of the C–C chemokine receptor 5 using single-molecule localization-based super-resolution microscopy. We determined arrestin 3 cluster sizes and relative fractions of arrestin 3 molecules in each cluster through image-based analysis of the localization data by adapting a method originally developed for co-localization analysis from molecular coordinates. We found that only classical agonists in the set of tested ligands were able to efficiently recruit arrestin 3 to clusters mostly larger than 150 nm in size and compare our results with existing data on arrestin 2 clustering induced by the same chemokine analogues.
KeywordsClustering Super-resolution microscopy Single-molecule localization microscopy G protein-coupled receptors Arrestin CCR5
We thank Jeffrey Benovic (Thomas Jefferson University) for the arrestin 3-GFP plasmid. This work was supported by the Swiss National Science Foundation through Ambizione fellowship PZ00P3_131935 (A.F.) and project number 310030_143789 (O.H.), as well as by Fondation Dormeur (O.H. and A.F.). M.H. acknowledges funding by the Bundesministerium für Bildung und Forschung (Grant Number 0315262) and the German Science Foundation (EXC 115).
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