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FLEXTAG: A Small and Self-renewable Protein Labeling System for Anti-fading Multicolor Super-resolution Imaging.

Han Zhang1, Yuan Yao1,2,3, Xuye Wang1

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Biorxiv : the Preprint Server for Biology
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We developed FLEXTAG, a novel protein labeling system for super-resolution microscopy. It overcomes limitations like photobleaching and poor labeling, enabling long-term, multi-color imaging of cellular structures.

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Area of Science:

  • Cell Biology
  • Microscopy
  • Biochemistry

Background:

  • Super-resolution fluorescence imaging offers nanoscale visualization but is limited by protein tagging issues.
  • Existing systems suffer from photobleaching, artifacts, poor labeling efficiency, and limited multiplexing.

Purpose of the Study:

  • To introduce FLEXTAG, a comprehensive protein labeling system designed to overcome current limitations in super-resolution microscopy.
  • To enable optimized multi-color super-resolution imaging with extended imaging durations and improved signal-to-noise ratio.

Main Methods:

  • Developed FLEXTAG, comprising three orthogonal, ultrasmall (<20 kDa), self-renewable protein tags.
  • Utilized continuous exchange of organic fluorophores for prolonged imaging.
  • Implemented a novel protection-based fixation method and chemical blocking strategies.

Main Results:

  • FLEXTAG minimizes photobleaching, allowing unprecedented durations of high-resolution imaging in live and fixed cells.
  • The system is compatible with major super-resolution modalities (SIM, STED, STORM, PAINT) and diverse subcellular targets.
  • Novel fixation and blocking strategies significantly improve tag accessibility and signal-to-noise ratio.

Conclusions:

  • FLEXTAG overcomes major limitations of existing protein tagging systems for advanced nanoscopy.
  • Enables long-term tracking of dynamic cellular behaviors and nanoscale protein organization.
  • Advances basic research and translational applications in cell biology through improved super-resolution imaging.