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Kai Johnsson

@kjohnsson.bsky.social
589 followers 117 following 11 posts

Chemical biologist @ Max Planck Institut for Medical Research in Heidelberg

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Kai Johnsson @kjohnsson.bsky.social · 22/04/2026
Localizable fluorescent metal ion indicators galore: advanced.onlinelibrary.wiley.com/doi/10.1002/...
advanced.onlinelibrary.wiley.com
Localizable Fluorescent Metal Ion Indicators With Tunable Colors
A modular platform enables the generation of fluorescent metal ion indicators with tunable emission colors and precise subcellular localization. Conjugation to self-labeling proteins yields bright, c...
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Kai Johnsson @kjohnsson.bsky.social · 26/03/2026
A high-affinity split-HaloTag for live-cell protein labeling. And much more. www.nature.com/articles/s41...
nature.com
A high-affinity split-HaloTag for live-cell protein labeling
Nature Communications - Lin and colleagues present high-affinity split-HaloTag pairs for protein tagging and multiplexed labelling. This versatile system allows protein visualisation with diverse...
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Kai Johnsson @kjohnsson.bsky.social · 08/03/2026
A Cinderella story: raising CLIP-tag from the ashes to shine in fluorescence labeling. www.biorxiv.org/content/10.6...
biorxiv.org
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Kai Johnsson @kjohnsson.bsky.social · 31/12/2025
A good end to 2025: rhodamine-binders for bioimaging in JACS: pubs.acs.org/doi/10.1021/...
pubs.acs.org
Fast, Bright, and Reversible Fluorescent Labeling of Rhodamine-Binding Proteins
Rhodamine dyes conjugated to targeting ligands can yield exceptionally bright fluorescent probes for live-cell imaging. However, the limited permeability of such rhodamine derivatives restricts their ...
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Kai Johnsson @kjohnsson.bsky.social · 10/07/2025
Molecular recording of cellular protein kinase activity with chemical labeling: www.nature.com/articles/s41... Congratulations to De-en Sun and the entire team.
nature.com
Molecular recording of cellular protein kinase activity with chemical labeling - Nature Chemical Biology
Molecular recorders based on kinase activity-dependent protein labeling track specific kinase activities to understand their link to cellular phenotypes in heterogeneous cell populations and in vivo.
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Kai Johnsson @kjohnsson.bsky.social · 09/07/2025
Teaching an old bacterial protein new tricks: Fast, bright and reversible rhodamine tags for live-cell imaging: www.biorxiv.org/content/10.1... Congratulations to Julian Kompa and the entire team.
biorxiv.org
Fast, Bright and Reversible Rhodamine Tags for Live-Cell Imaging
We present Rho-tag and SiR-tag, engineered protein tags derived from bacterial multidrug-resistance proteins that bind unsubstituted (silicon-) rhodamines with nanomolar affinity, enabling fast, rever...
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Kai Johnsson @kjohnsson.bsky.social · 03/07/2025
Finally out in Nature Chem Bio: SNAP-tag2 for faster and brighter protein labeling www.nature.com/articles/s41... Thank you Steffi and Veselin.
nature.com
SNAP-tag2 for faster and brighter protein labeling - Nature Chemical Biology
SNAP-tag is a widespread tool for labeling protein for bioimaging. Now, Kühn et al. report SNAP-tag2 with increased labeling kinetics and brightness, which translates into a better performance in live...
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Kai Johnsson @kjohnsson.bsky.social · 16/06/2025
Please check out our new high-affinity split-HaloTag for live-cell protein labeling www.biorxiv.org/content/10.1... Congratulations to Yin-Hsi Lin!
biorxiv.org
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Kai Johnsson @kjohnsson.bsky.social · 18/04/2025
Improving split-HaloTag through computational protein engineering: onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Improving split‐HaloTag through computational protein engineering
Split-HaloTag can be used to transform transient molecular interactions into permanent marks through chemical labeling, thereby enabling the recording of transient physiological events in individual ....
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Kai Johnsson @kjohnsson.bsky.social · 07/02/2025
Check out our new fluorescent probe for imaging f-actin dynamics: 𝗦𝗶𝗥-𝗫𝗔𝗰𝘁𝗶𝗻: 𝗔 𝗳𝗹𝘂𝗼𝗿𝗲𝘀𝗰𝗲𝗻𝘁 𝗽𝗿𝗼𝗯𝗲 𝗳𝗼𝗿 𝗶𝗺𝗮𝗴𝗶𝗻𝗴 𝗮𝗰𝘁𝗶𝗻 𝗱𝘆𝗻𝗮𝗺𝗶𝗰𝘀 𝗶𝗻 𝗹𝗶𝘃𝗲 𝗰𝗲𝗹𝗹𝘀 www.biorxiv.org/content/10.1... Thank you @veselin-nasufovic.bsky.social
biorxiv.org
SiR-XActin: A fluorescent probe for imaging actin dynamics in live cells
Imaging actin-dependent processes in live cells is important for understanding numerous biological processes. However, currently used natural-product based fluorescent probes for actin filaments affec...
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