Structure-Based Rational Design of Two Enhanced Bacterial Lipocalin Blc Tags for Protein-PAINT Super-resolution Microscopy.
ACS Chem Biol
; 15(9): 2456-2465, 2020 09 18.
Article
in En
| MEDLINE
| ID: mdl-32809793
ABSTRACT
Super-resolution fluorescent imaging in living cells remains technically challenging, largely due to the photodecomposition of fluorescent tags. The recently suggested protein-PAINT is the only super-resolution technique available for prolonged imaging of proteins in living cells. It is realized with complexes of fluorogen-activating proteins, expressed as fusions, and solvatochromic synthetic dyes. Once photobleached, the dye in the complex is replaced with a fresh fluorogen available in the sample. With suitable kinetics, this replacement creates fluorescence blinking required for attaining super-resolution and overcomes photobleaching associated with the loss of an irreplaceable fluorophore. Here we report on the rational design of two protein-PAINT tags based on the 1.58 Å crystal structure of the DiB1M739 complex, an improved green-emitting DiB3/F74VM739 and a new orange-emitting DiB3/F53LM739. They outperform previously reported DiB-based tags to become best in class biomarkers for protein-PAINT. The new tags advance protein-PAINT from the proof-of-concept to a reliable tool suitable for prolonged super-resolution imaging of intracellular proteins in fixed and living cells and two-color PAINT-like nanoscopy with a single fluorogen.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vimentin
/
Boron Compounds
/
Lipocalins
/
Fluorescent Dyes
/
Keratins
Limits:
Humans
Language:
En
Journal:
ACS Chem Biol
Year:
2020
Document type:
Article
Affiliation country:
United States