期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 52, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaf255
关键词
single-molecule tracking; super-resolution microscopy; Halo tag; photoactivatable fluorescent protein; DNA-binding proteins; Escherichia coli; fluorophores
资金
- Wellcome Trust [107457/Z/15/Z]
- Sir Henry Dale Fellowship - Wellcome Trust [206159/Z/17/Z]
- Sir Henry Dale Fellowship - Royal Society [206159/Z/17/Z]
- Wellcome-Beit Prize [206159/Z/17/B]
- Hugh Price Fellowship at Jesus College Oxford
- Wellcome Trust [206159/Z/17/B, 206159/Z/17/Z] Funding Source: Wellcome Trust
Visualizing and quantifying molecular motion and interactions inside living cells provides crucial insight into the mechanisms underlying cell function. This has been achieved by super-resolution localization microscopy and single-molecule tracking in conjunction with photoactivatable fluorescent proteins (PA-FPs). An alternative labelling approach relies on genetically-encoded protein tags with cell-permeable fluorescent ligands which are brighter and less prone to photobleaching than fluorescent proteins but require a laborious labelling process. Either labelling method is associated with significant advantages and disadvantages that should be taken into consideration depending on the microscopy experiment planned. Here, we describe an optimised procedure for labelling Halo-tagged proteins in live Escherichia coli cells. We provide a side-by-side comparison of Halo tag with different fluorescent ligands against the popular photoactivatable fluorescent protein PAmCherry. Using test proteins with different intracellular dynamics, we evaluated fluorescence intensity, background, photostability, and results from single-molecule localization and tracking experiments. Capitalising on the brightness and extended spectral range of fluorescent Halo ligands, we also demonstrate high-speed and dual-colour single-molecule tracking.
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