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- Title
MINSTED nanoscopy enters the Ångström localization range.
- Authors
Weber, Michael; von der Emde, Henrik; Leutenegger, Marcel; Gunkel, Philip; Sambandan, Sivakumar; Khan, Taukeer A.; Keller-Findeisen, Jan; Cordes, Volker C.; Hell, Stefan W.
- Abstract
Super-resolution techniques have achieved localization precisions in the nanometer regime. Here we report all-optical, room temperature localization of fluorophores with precision in the Ångström range. We built on the concept of MINSTED nanoscopy where precision is increased by encircling the fluorophore with the low-intensity central region of a stimulated emission depletion (STED) donut beam while constantly increasing the absolute donut power. By blue-shifting the STED beam and separating fluorophores by on/off switching, individual fluorophores bound to a DNA strand are localized with σ = 4.7 Å, corresponding to a fraction of the fluorophore size, with only 2,000 detected photons. MINSTED fluorescence nanoscopy with single-digit nanometer resolution is exemplified by imaging nuclear pore complexes and the distribution of nuclear lamin in mammalian cells labeled by transient DNA hybridization. Because our experiments yield a localization precision σ = 2.3 Å, estimated for 10,000 detected photons, we anticipate that MINSTED will open up new areas of application in the study of macromolecular complexes in cells. Sub-nanometer localization precision is achieved with all-optical microscopy.
- Publication
Nature Biotechnology, 2023, Vol 41, Issue 4, p569
- ISSN
1087-0156
- Publication type
Article
- DOI
10.1038/s41587-022-01519-4