Kai Johnsson

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Kinetic and Structural Characterization of the Self-Labeling Protein Tags HaloTag7, SNAP-tag, and CLIP-tag

Kai Johnsson, Julien Hiblot, Iuliia Karpenko

The self-labeling protein tags (SLPs) HaloTag7, SNAP-tag, and CLIP-tag allow the covalent labeling of fusion proteins with synthetic molecules for applications in bioimaging and biotechnology. To guide the selection of an SLP-substrate pair and provide gui ...

AMER CHEMICAL SOC2021

Systematic Tuning of Rhodamine Spirocyclization for Super-resolution Microscopy

Kai Johnsson, Lu Wang

Rhodamines are the most important class of fluorophores for applications in live-cell fluorescence microscopy. This is mainly because rhodamines exist in a dynamic equilibrium between a fluorescent zwitterion and a nonfluorescent but cell-permeable spirocy ...

AMER CHEMICAL SOC2021

A general strategy to develop cell permeable and fluorogenic probes for multicolour nanoscopy

Kai Johnsson, Lu Wang, Lin Xue

It is difficult to develop suitable fluorescent probes for live-cell nanoscopy, but a general strategy is now reported that can transform regular fluorophores into fluorogenic probes with excellent cell permeability and low unspecific background signals. U ...

NATURE PUBLISHING GROUP2020

Chemogenetic Control of Nanobodies

Kai Johnsson, Julien Hiblot, Helen Rebecca Ostlund Farrants

Engineered nanobody allows reversible control of activity in cells through the binding of small molecules. ...

NATURE PUBLISHING GROUP2020

6,11-Dioxobenzo[f]pyrido[1,2-a]indoles Kill Mycobacterium tuberculosis by Targeting Iron-Sulfur Protein Rv0338c (IspQ), A Putative Redox Sensor

Stewart Cole, Kai Johnsson, Andrej Benjak, Jérémie Piton, Edina Rita Székely, Monica Rengifo Gonzalez

Screening of a diversity-oriented compound library led to the identification of two 6,11-dioxobenzo[f]pyrido[1,2-a]indoles (DBPI) that displayed low micromolar bactericidal activity against the Erdman strain of Mycobacterium tuberculosis in vitro. The acti ...

AMER CHEMICAL SOC2020

Activatable fluorescent probes for hydrolase enzymes based on coumarin-hemicyanine hybrid fluorophores with large Stokes shifts

Kai Johnsson, Mako Kamiya

We show that the equilibrium of intramolecular spirocyclization of coumarin-hemicyanine hybrid fluorophores can be finely tuned by means of chemical modifications. We used this scaffold to develop activatable fluorescent probes with large Stokes shifts for ...

Royal Society of Chemistry2020

Environmentally Sensitive Color-Shifting Fluorophores for Bioimaging

Kai Johnsson, Julien Hiblot

We introduce color-shifting fluorophores that reversibly switch between a green and red fluorescent form through intramolecular spirocyclization. The equilibrium of the spirocyclization is environmentally sensitive and can be directly measured by determini ...

Wiley-VCH Verlag GmbH2020

SLC25A51 is a mammalian mitochondrial NAD(+) transporter

Kai Johnsson, Liang Wang

Mitochondria require nicotinamide adenine dinucleotide (NAD(+)) to carry out the fundamental processes that fuel respiration and mediate cellular energy transduction. Mitochondrial NAD(+) transporters have been identified in yeast and plants(1,2), but thei ...

NATURE RESEARCH2020

A ligand-based system for receptor-specific delivery of proteins

Kai Johnsson, Luc Reymond

Gene delivery using vector or viral-based methods is often limited by technical and safety barriers. A promising alternative that circumvents these shortcomings is the direct delivery of proteins into cells. Here we introduce a non-viral, ligand-mediated p ...

Springer Nature2019

Small-Molecule Fluorescent Probes for Live-Cell Super-Resolution Microscopy

Kai Johnsson, Aleksandar Salim, Lu Wang, Michelle Susanne Frei

Super-resolution fluorescence microscopy is a powerful tool to visualize biomolecules and cellular structures at the nanometer scale. Employing these techniques in living cells has opened up the possibility to study dynamic processes with unprecedented spa ...

AMER CHEMICAL SOC2019

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NATURE PUBLISHING GROUP2020

6,11-Dioxobenzo[f]pyrido[1,2-a]indoles Kill Mycobacterium tuberculosis by Targeting Iron-Sulfur Protein Rv0338c (IspQ), A Putative Redox Sensor

Stewart Cole, Kai Johnsson, Andrej Benjak, Jérémie Piton, Edina Rita Székely, Monica Rengifo Gonzalez

AMER CHEMICAL SOC2020

SLC25A51 is a mammalian mitochondrial NAD(+) transporter

Kai Johnsson, Liang Wang

NATURE RESEARCH2020

Activatable fluorescent probes for hydrolase enzymes based on coumarin-hemicyanine hybrid fluorophores with large Stokes shifts

Kai Johnsson, Mako Kamiya

Royal Society of Chemistry2020