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Kai Johnsson

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Publications associées (125)

Unintended specificity of an engineered ligand-binding protein facilitated by unpredicted plasticity of the protein fold

Kai Johnsson, Alberto Schena

Attempts to create novel ligand-binding proteins often focus on formation of a binding pocket with shape complementarity against the desired ligand (particularly for compounds that lack distinct polar moieties). Although designed proteins often exhibit bin ...

OXFORD UNIV PRESS2018

Sepiapterin reductase inhibitors

Kai Johnsson, Katarzyna Irena Gorska

Inhibitors of sepiapterin reductase and uses of sepiapterin reductase inhibitors in analgesia, treatment of acute and chronic pain, anti-inflammation, and immune cell regulation are disclosed. ...

2017

Bioluminescent Antibodies for Point-of-Care Diagnostics

Kai Johnsson, Alberto Schena, Rudolf Griss, Qiuliyang Yu, Lin Xue

We introduce a general method to transform antibodies into ratiometric, bioluminescent sensor proteins for the no-wash quantification of analytes. Our approach is based on the genetic fusion of antibody fragments to NanoLuc luciferase and SNAP-tag, the lat ...

Wiley-VCH Verlag GmbH2017

Identification of aminopyrimidine-sulfonamides as potent modulators of Wag31-mediated cell elongation in mycobacteria

Kai Johnsson, Gaëlle Séraphine Kolly, Graham Knott, John McKinney, Stewart Cole, Neeraj Dhar, Monica Rengifo Gonzalez, Ruben Hartkoorn, Isabella Santi, Edina Rita Székely, François Signorino-Gelo, Jan Lars Rybniker, Anthony Vocat

There is an urgent need to discover new antitubercular agents with novel mechanisms of action in order to tackle the scourge of drug-resistant tuberculosis. Here, we report the identification of such a molecule - an AminoPYrimidine-Sulfonamide (APYS1) that ...

Wiley-Blackwell2017

Computational design of environmental sensors for the potent opioid fentanyl

Kai Johnsson, Luc Reymond

We describe the computational design of proteins that bind the potent analgesic fentanyl. Our approach employs a fast docking algorithm to find shape complementary ligand placement in protein scaffolds, followed by design of the surrounding residues to opt ...

Elife Sciences Publications Ltd2017

Highly Modular Bioluminescent Sensors for Small Molecules and Proteins

Kai Johnsson, Alberto Schena, Rudolf Griss, Qiuliyang Yu

Obtaining patient-specific information through the quantification of small molecules and proteins in bodily fluids is essential for personalized therapies. Point-of-care (POC) diagnostic devices hold the promise of delivering such benefit to a wide range o ...

Elsevier Academic Press Inc2017

Expression proteomics study to determine metallodrug targets and optimal drug combinations

Kai Johnsson, Paul Joseph Dyson, David Hacker, Claire Samantha Allardyce

The emerging technique termed functional identification of target by expression proteomics (FITExP) has been shown to identify the key protein targets of anti-cancer drugs. Here, we use this approach to elucidate the proteins involved in the mechanism of a ...

Nature Research2017

Luciferases with tunable emission wavelengths

Kai Johnsson, Luc Reymond, Olivier Vincent Sallin, Alberto Schena, Rudolf Griss, Qiuliyang Yu, Lin Xue, Julien Hiblot, Nicholas Clarke Hill, Marina Daniela Beatrice Sabbadini

We introduce luciferases whose emission maxima can be tuned to different wavelengths by chemical labeling. These tunable luciferases are generated by inserting the small luciferase NanoLuc into the structures of the self-labeling proteins SNAP-tag or HaloT ...

Wiley-Blackwell2017

Evaluating Cellular Drug Uptake with Fluorescent Sensor Proteins

Rudolf Hovius, Kai Johnsson, Kui Thong Tan, Rudolf Griss, Silvia Scarabelli

We are introducing a new approach to evaluate cellular uptake of drugs and drug candidates into living cells. The approach is based on converting the protein target of a given class of compounds into a fluorescent biosensor. By measuring the binding of dif ...

Amer Chemical Soc2017

Means and methods for bioluminescence resonance energy transfer (bret) analysis in a biological sample

Kai Johnsson, Alberto Schena, Rudolf Griss

The invention relates to the field of in vitro detection methods using luminescence. Provided is a sensor molecule for detecting an analyte of interest in a sample using bioluminescence resonance energy transfer (BRET), the sensor molecule comprising a pro ...

2016

Sensors, methods and kits for detecting nicotinamide adenine dinucleotides

Kai Johnsson, Luc Reymond, Olivier Vincent Sallin

The invention relates to the in vitro and in cellulo detection of the cofactors nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP). Provided is a sensor molecule for fluorescence or luminescence-based detection o ...

2016

Acetylated tubulin is essential for touch sensation in mice

Kai Johnsson, Luc Reymond, Antonino Asaro

At its most fundamental level, touch sensation requires the translation of mechanical energy into mechanosensitive ion channel opening, thereby generating electro-chemical signals. Our understanding of this process, especially how the cytoskeleton influenc ...

Elife Sciences Publications Ltd2016

Fluorogenic Probes for Multicolor Imaging in Living Cells

Kai Johnsson, Luc Reymond, Grazvydas Lukinavicius, Olivier Vincent Sallin, Keitaro Umezawa

Here we present a far-red, silicon-rhodamine-based fluorophore (SiR700) for live-cell multicolor imaging. SiR700 has excitation and emission maxima at 690 nm and 715 nm, respectively. SiR700-based probes for F-actin, microtubules, lysosomes and SNAP-tag ar ...

American Chemical Society2016

Chemical Genetic Screen Identifies Natural Products that Modulate Centriole Number

Kai Johnsson, Pierre Gönczy, Zhou Fang, Michele Graciotti

Centrioles are microtubule-based organelles found in most eukaryotic cells and that are critical for the formation of cilia and flagella, as well as of centrosomes in animal cells. The number of centrioles must be strictly regulated in proliferating cells ...

Wiley-Blackwell2016

Sensor molecules and uses thereof

Kai Johnsson, Alberto Schena, Rudolf Griss

The invention generally relates to methods, reagents and devices for determining a concentration of an analyte in a sample. Provided is a proteinaceous sensor molecule for detecting an analyte of interest (A), comprising a signal generating moiety tethered ...

2015

NanoSIMS analysis of an isotopically labelled organometallic ruthenium(II) drug to probe its distribution and state in vitro

Kai Johnsson, Paul Joseph Dyson, Graham Knott, Mary-Claude Croisier-Coeytaux, Anders Meibom, Stéphane Laurent Escrig

The in vitro inter-and intra-cellular distribution of an isotopically labelled ruthenium(II)-arene (RAPTA) anti-metastatic compound in human ovarian cancer cells was imaged using nano-scale secondary ion mass spectrometry (NanoSIMS). Ultra-high resolution ...

Royal Society of Chemistry2015

Tetrahydrobiopterin Biosynthesis as a Potential Target of the Kynurenine Pathway Metabolite Xanthurenic Acid

Rudolf Hovius, Kai Johnsson, Miriam Grønlund Pedersen, Hirohito Haruki

Tryptophan metabolites in the kynurenine pathway are up-regulated by pro-inflammatory cytokines or glucocorticoids, and are linked to anti-inflammatory and immunosuppressive activities. In addition, they are up-regulated in pathologies such as cancer, auto ...

Amer Soc Biochemistry Molecular Biology Inc2015

Genetically encoded biosensor for cell permeability of inhibitors of the p53-HDM2 interaction

Kai Johnsson, Silvia Scarabelli

Wiley-Blackwell2015

Imaging and manipulating proteins in live cells through covalent labeling

Kai Johnsson, Lin Xue, Julien Hiblot, Iuliia Karpenko

The past 20 years have witnessed the advent of numerous technologies to specifically and covalently label proteins in cellulo and in vivo with synthetic probes. These technologies range from self-labeling proteins tags to non-natural amino acids, and the q ...

Nature Publishing Group2015

Genetic targeting of chemical indicators in vivo

Kai Johnsson, Luc Reymond, Antonino Asaro

Fluorescent protein reporters have become the mainstay for tracing cellular circuitry in vivo but are limited in their versatility. Here we generated Cre-dependent reporter mice expressing the Snap-tag to target synthetic indicators to cells. Snap-tag labe ...

Nature Publishing Group2015

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