6ubo
Fluorogen Activating Protein Dib1
Structural highlights
FunctionBLC_ECOLI Involved in the storage or transport of lipids necessary for membrane maintenance under stressful conditions. Displays a binding preference for lysophospholipids.[1] Publication Abstract from PubMedSuper-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 A crystal structure of the DiB1:M739 complex, an improved green-emitting DiB3/F74V:M739 and a new orange-emitting DiB3/F53L:M739. 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. Structure-Based Rational Design of Two Enhanced Bacterial Lipocalin Blc Tags for Protein-PAINT Super-resolution Microscopy.,Muslinkina L, Gavrikov AS, Bozhanova NG, Mishin AS, Baranov MS, Meiler J, Pletneva NV, Pletnev VZ, Pletnev S ACS Chem Biol. 2020 Sep 18;15(9):2456-2465. doi: 10.1021/acschembio.0c00440. Epub, 2020 Sep 8. PMID:32809793[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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