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NanoLuc Complementation Reporter Optimized for Accurate Measurement of Protein Interactions in Cells

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TLDR
NanoBiT provided a means to measure pharmacology of kinase inhibitors known to induce the interaction between BRAF and CRAF and that the reporter responds reliably and dynamically in cells.
Abstract
Protein-fragment complementation assays (PCAs) are widely used for investigating protein interactions. However, the fragments used are structurally compromised and have not been optimized nor thoroughly characterized for accurately assessing these interactions. We took advantage of the small size and bright luminescence of NanoLuc to engineer a new complementation reporter (NanoBiT). By design, the NanoBiT subunits (i.e., 1.3 kDa peptide, 18 kDa polypeptide) weakly associate so that their assembly into a luminescent complex is dictated by the interaction characteristics of the target proteins onto which they are appended. To ascertain their general suitability for measuring interaction affinities and kinetics, we determined that their intrinsic affinity (KD = 190 μM) and association constants (kon = 500 M–1 s–1, koff = 0.2 s–1) are outside of the ranges typical for protein interactions. The accuracy of NanoBiT was verified under defined biochemical conditions using the previously characterized interaction...

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Citations
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Illuminating G-Protein-Coupling Selectivity of GPCRs.

TL;DR: This work systematically quantified ligand-induced interactions between 148 GPCRs and all 11 unique Gα subunit C termini, and identified sequence-based coupling specificity features, inside and outside the transmembrane domain, which were used to develop a coupling predictor that outperforms previous methods.
Journal ArticleDOI

NanoLuc: A Small Luciferase Is Brightening Up the Field of Bioluminescence.

TL;DR: This review will present the NLuc technology to the scientific community in a nonbiased manner, allowing the audience to adopt their own views of this novel system.
Journal ArticleDOI

Structure of the neurotensin receptor 1 in complex with β-arrestin 1.

TL;DR: It is found that phosphorylation of NTSR1 is critical for the formation of a stable complex with β-arrestin 1, and phosphorylated sites in both the third intracellular loop and the C terminus that may promote this interaction are identified.
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Mini G protein probes for active G protein-coupled receptors (GPCRs) in live cells.

TL;DR: Mini G proteins are robust probes that can be used in a variety of assay formats to report GPCR activity in living cells and should be useful for discovering and characterizing G protein subtype–biased ligands.
References
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Journal ArticleDOI

Engineering hybrid genes without the use of restriction enzymes: gene splicing by overlap extension.

TL;DR: Gene splicing by overlap extension is a new approach for recombining DNA molecules at precise junctions irrespective of nucleotide sequences at the recombination site and without the use of restriction endonucleases or ligase.
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RAF inhibitors prime wild-type RAF to activate the MAPK pathway and enhance growth

TL;DR: It is demonstrated that ATP-competitive kinase inhibitors can have opposing functions as inhibitors or activators of signalling pathways, depending on the cellular context, which provides new insights into the therapeutic use of ATP- competitive RAF inhibitors.
Journal ArticleDOI

Engineered luciferase reporter from a deep sea shrimp utilizing a novel imidazopyrazinone substrate.

TL;DR: A novel bioluminescence system capable of more efficient light emission with superior biochemical and physical characteristics is engineered in mammalian cells by merging optimization of protein structure with development of a novel imidazopyrazinone substrate (furimazine).
Journal ArticleDOI

Association of β-Arrestin with G Protein-coupled Receptors during Clathrin-mediated Endocytosis Dictates the Profile of Receptor Resensitization *

TL;DR: It is demonstrated that the interaction of β-arrestin with a specific motif in the GPCR carboxyl-terminal tail dictates the rate of receptor dephosphorylation, recycling, and resensitization, and thus provides direct evidence for a novel mechanism by which β-Arrestins regulate the reestablishment of G PCR responsiveness.
Journal ArticleDOI

Characterization of the FKBP.rapamycin.FRB ternary complex.

TL;DR: Rapamycin's ability to bind to FRB, and by extension to mTOR, in the absence of FKBP is of little consequence under physiological conditions, and protein-protein interactions at the FK BP12-FRB interface play a role in the stability of the ternary complex.
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