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Benchmarking Thiolate-Driven Photoswitching of Cyanine Dyes.

Authors :
Herdly L
Tinning PW
Geiser A
Taylor H
Gould GW
van de Linde S
Source :
The journal of physical chemistry. B [J Phys Chem B] 2023 Jan 26; Vol. 127 (3), pp. 732-741. Date of Electronic Publication: 2023 Jan 13.
Publication Year :
2023

Abstract

Carbocyanines are among the best performing dyes in single-molecule localization microscopy (SMLM), but their performance critically relies on optimized photoswitching buffers. Here, we study the versatile role of thiols in cyanine photoswitching at varying intensities generated in a single acquisition by a microelectromechanical systems (MEMS) mirror placed in the excitation path. The key metrics we have analyzed as a function of the thiolate concentration are photon budget, on-state and off-state lifetimes and the corresponding impact on image resolution. We show that thiolate acts as a concentration bandpass filter for the maximum achievable resolution and determine a minimum of ∼1 mM is necessary to facilitate SMLM measurements. We also identify a concentration bandwidth of 1-16 mM in which the photoswitching performance can be balanced between high molecular brightness and high off-time to on-time ratios. Furthermore, we monitor the performance of the popular oxygen scavenger system based on glucose and glucose oxidase over time and show simple measures to avoid acidification during prolonged measurements. Finally, the impact of buffer settings is quantitatively tested on the distribution of the glucose transporter protein 4 within the plasma membrane of adipocytes. Our work provides a general strategy for achieving optimal resolution in SMLM with relevance for the development of novel buffers and dyes.

Details

Language :
English
ISSN :
1520-5207
Volume :
127
Issue :
3
Database :
MEDLINE
Journal :
The journal of physical chemistry. B
Publication Type :
Academic Journal
Accession number :
36638265
Full Text :
https://doi.org/10.1021/acs.jpcb.2c06872