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  • Single-Chain Lanthanide Luminescence Biosensors for Cell-Based Imaging and Screening of Protein-Protein Interactions.

Single-Chain Lanthanide Luminescence Biosensors for Cell-Based Imaging and Screening of Protein-Protein Interactions.

iScience (2020-10-22)
Ting Chen, Ha Pham, Ali Mohamadi, Lawrence W Miller
ABSTRACT

Lanthanide-based, Förster resonance energy transfer (LRET) biosensors enabled sensitive, time-gated luminescence (TGL) imaging or multiwell plate analysis of protein-protein interactions (PPIs) in living cells. We prepared stable cell lines that expressed polypeptides composed of an alpha helical linker flanked by a Tb(III) complex-binding domain, GFP, and two interacting domains at each terminus. The PPIs examined included those between FKBP12 and the rapamycin-binding domain of m-Tor (FRB) and between p53 (1-92) and HDM2 (1-128). TGL microscopy revealed dramatic differences (>500%) in donor- or acceptor-denominated, Tb(III)-to-GFP LRET ratios between open (unbound) and closed (bound) states of the biosensors. We observed much larger signal changes (>2,500%) and Z'-factors of 0.5 or more when we grew cells in 96- or 384-well plates and analyzed PPI changes using a TGL plate reader. The modular design and exceptional dynamic range of lanthanide-based LRET biosensors will facilitate versatile imaging and cell-based screening of PPIs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
β-Nicotinamide adenine dinucleotide 2′-phosphate reduced tetrasodium salt, vial of 1 mg
Sigma-Aldrich
L-(−)-Glucose, ≥99%
Sigma-Aldrich
Patent blue V sodium salt, for microscopy
Sigma-Aldrich
Doxycycline hyclate
Sigma-Aldrich
Nutlin-3, ≥98% (HPLC), powder