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Karim Almahayni 🍉

@karimalmahayni.bsky.social
48 followers 36 following 9 posts

Microscopy🔬| Glycans🍭| Pharmacology 💊@MPI_Light |@uniofoxford ‘20, @sheffielduni ‘19

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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 23/04/2026
It’s a huge honor to be one of the recipients of this year’s EKFS publication award! Check out the manuscript that was awarded: www.nature.com/articles/s41...
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Karim Almahayni 🍉 @karimalmahayni.bsky.social · 18/03/2026
Reading this makes me want to do a PhD again! Incredible lab, great leadership, and very cool science 🔬🍬
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Reposted by Karim Almahayni 🍉
Luciano A. Masullo @lumasullo.bsky.social · 18/10/2025
Our article "Ångström-resolution imaging of cell-surface glycans" made it to the cover of Nature Nanotechnology! 🤩 @natnano.nature.com www.nature.com/nnano/volume...
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Reposted by Karim Almahayni 🍉
Nature Nanotechnology @natnano.nature.com · 17/10/2025
Now online: October 2025 Issue. - Focus Issue on #biosensing, - DNA moiré superlattices, - Sugars at Ångström-resolution, - Solid-state #nanopores, - Non-aqueous Li #batteries, - - Neuromorphic vision, - Peptide #hydrogels, - Deep learning for #LNPs and more... www.nature.com/nnano/volume...
The image on the cover shows two sugars from the same cell-surface glycan separated by 9 Å, visualized with RESI (resolution enhancement by sequential imaging) enabled by metabolic labelling with DNA barcodes.

IMAGE: Luciano A. Masullo, Max Planck Institute of Biochemistry,  Germany.

COVER DESIGN: Vanitha Selvarajan

Original paper: Masullo, L.A.,  et al. Ångström-resolution imaging of cell-surface glycans. Nat. Nanotechnol. 20, 1457–1463 (2025). https://doi.org/10.1038/s41565-025-01966-5

Abstract: Glycobiology is rooted in the study of monosaccharides, ångström-sized molecules that are the building blocks of glycosylation. Glycosylated biomolecules form the glycocalyx, a dense coat encasing every human cell with central relevance—among others—in immunology, oncology and virology. To understand glycosylation function, visualizing its molecular structure is fundamental. However, the ability to visualize the molecular architecture of the glycocalyx has remained challenging. Techniques such as mass spectrometry, electron microscopy and fluorescence microscopy lack the necessary cellular context, specificity and resolution. Here we combine resolution enhancement by sequential imaging with metabolic labelling, enabling the visualization of individual sugars within glycans on the cell surface, thus obtaining images of the glycocalyx with a spatial resolution down to 9 Å in an optical microscope.
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Reposted by Karim Almahayni 🍉
Max Planck Institute for the Science of Light (MPL) @mpi-scienceoflight.bsky.social · 08/10/2025
With deep sadness, we share that Prof. Jochen Guck, Director at the Max Planck Institute for the Science of Light passed away on October 3. His visionary work bridged physics and medicine. We have lost a brilliant scientist and dear friend. mpl.mpg.de/news/article... @fau.de 📸 Stephan Spangenberg
Professor Jochen Guck, Director at the Max Planck Institute for the Science of Light (MPL), He headed the division “Cell Physics” at MPL and the Max-Planck-Zentrum für Physik und Medizin (MPZPM).
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Reposted by Karim Almahayni 🍉
Ryan Flynn @raflynn5.bsky.social · 07/10/2025
We’re excited to report work led by postdoc Jennifer Porat in the lab, finding that DNA accumulates on the surface of living cells and that the secreted extracellular protein DNASE1L3 can modulate its levels on B and T cells. With a new twist for ATAC-seq as well www.biorxiv.org/content/10.1...
biorxiv.org
DNASE1L3 surveils mitochondrial DNA on the surface of distinct mammalian cells
The extracellular space is a critical environment for discriminating self versus non-self nucleic acids and initiating the appropriate immune responses through signaling cascades to relay information ...
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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 28/08/2025
Excited to see this one out in JACS! We analyzed how molecular interactions lead to self-organization of glycolipids down to microseconds and nanometer spatiotemporal scales. Amazing collaboration with the Sandoghdar lab, @biomemphys.bsky.social, and Thisbe Lindhorst! pubs.acs.org/doi/abs/10.1...
pubs.acs.org
Bottom-up Investigation of Spatiotemporal Glycocalyx Dynamics with Interferometric Scattering Microscopy
Over recent decades, the glycocalyx, an extracellular organelle composed of a multitude of glycolipids, glycoproteins, proteoglycans, and glycoRNA, has gained considerable interest in cellular biology...
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Reposted by Karim Almahayni 🍉
Nature Nanotechnology @natnano.nature.com · 06/08/2025
Research Briefing: "Visualizing the nanostructure of the cell’s sugar coat." Here, the author's views, expert opinion, and insights behind the recently published paper "Ångström-resolution imaging of cell-surface glycans" are presented. #Glycotime www.nature.com/articles/s41...
nature.com
Visualizing the nanostructure of the cell’s sugar coat - Nature Nanotechnology
The glycocalyx, the cell’s sugar coat, has key roles in immunology, cancer, viral infections, and more. Visualizing its molecular architecture was impossible until now. Here, we combine metabolic labe...
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Reposted by Karim Almahayni 🍉
Nature @nature.com · 03/08/2025
Scientists have mapped individual sugar molecules on the surface of cells at a resolution once thought to be impossible for light microscopes go.nature.com/40I9Ewv
go.nature.com
Cell's sugar coating mapped at below-nanometre resolution
Nature - Super-resolution technique works with off-the-shelf optical microscopes.
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Reposted by Karim Almahayni 🍉
Luciano A. Masullo @lumasullo.bsky.social · 30/07/2025
Ångström-resolution imaging of cell-surface glycans Now published in Nature Nanotechnology! 🤩 @natnano.nature.com www.nature.com/articles/s41...
nature.com
Ångström-resolution imaging of cell-surface glycans - Nature Nanotechnology
By combining bioorthogonal metabolic labelling and resolution enhancement through sequential imaging of DNA barcodes, the molecular organization of individual sugars in the native glycocalyx has been ...
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Reposted by Karim Almahayni 🍉
Nature @nature.com · 30/07/2025
Scientists have mapped individual sugar molecules on the surface of cells at a resolution once thought to be impossible for light microscopes go.nature.com/4l2wVjS
go.nature.com
Cell's sugar coating mapped at below-nanometre resolution
Super-resolution technique works with off-the-shelf optical microscopes.
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Reposted by Karim Almahayni 🍉
Nature Nanotechnology @natnano.nature.com · 30/07/2025
News article @nature.com covering a recent study published @natnano.nature.com Cell's sugar coating mapped at below-nanometre resolution. "Super-resolution technique works with off-the-shelf optical microscopes." #Glycotime www.nature.com/articles/d41...
nature.com
Cell's sugar coating mapped at below-nanometre resolution
Super-resolution technique works with off-the-shelf optical microscopes.
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Reposted by Karim Almahayni 🍉
Dr. Fiona @fionachembot.bsky.social · 29/07/2025
Excuse me while i geek out over this so hard #GlycoTime ( @elisafadda.bsky.social 👀 👀 👀)
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Reposted by Karim Almahayni 🍉
Nature Nanotechnology @natnano.nature.com · 28/07/2025
New paper online: Ångström-resolution imaging of cell-surface glycans. The molecular organization of sugars in the native #glycocalyx has been resolved at 9 ångström using bioorthogonal metabolic labeling and #superresolution imaging of DNA barcodes. #Glycotime www.nature.com/articles/s41...
nature.com
Ångström-resolution imaging of cell-surface glycans - Nature Nanotechnology
By combining bioorthogonal metabolic labelling and resolution enhancement through sequential imaging of DNA barcodes, the molecular organization of individual sugars in the native glycocalyx has been ...
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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 28/07/2025
Very happy to see this one out - the first molecular-resolution imaging of glycocalyx components in their native environment! Great collaboration with @jungmannlab.bsky.social - congrats to first authors @karimalmahayni.bsky.social and @lumasullo.bsky.social and to the whole team!
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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 02/05/2025
GLYCAN ATLASSING: NANOSCALE ANALYSIS OF GLYCOCALYX ARCHITECTURE ENABLES FUNCTIONAL TRACING OF CELL STATE 🍭🔬🧬 Don’t judge a book by its cover - judge a cell by its cover! We can now trace how cell state is encoded in glycocalyx state. #glycotime #microscopy www.biorxiv.org/content/10.1...
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Reposted by Karim Almahayni 🍉
Janis Gonzales MD MPH FAAP @jgonzalesmd.bsky.social · 26/04/2025
My daughter died from AML and I don’t want any other parent to go through what we did. This type of vital research must be funded.
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Reposted by Karim Almahayni 🍉
Nature Biotechnology @natbiotech.nature.com · 25/04/2025
A new druggable cancer target: RNA-binding proteins on the cell surface #NBTintheNews answers.childrenshospital.org/aml-cancer-t...
answers.childrenshospital.org
A druggable target for AML: cell-surface RNA-binding proteins - Boston Children's Answers
Researchers have found a readily druggable target on the surface of acute myeloid leukemia (AML) cells — but not normal blood cells.
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Reposted by Karim Almahayni 🍉
Carolyn Bertozzi @carolynbertozzi.bskyverified.social · 25/04/2025
Check it out - amazing new work by @raflynn5.bsky.social and Kostas Tzelepis labs, discovery of a cell surface RNA/glycoRNA binding protein that is also a cancer antigen, new target for antibody therapy! www.nature.com/articles/s41...
nature.com
Treatment of acute myeloid leukemia models by targeting a cell surface RNA-binding protein - Nature Biotechnology
An RNA-binding protein on leukemia cells provides an effective target in mouse models.
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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 23/04/2025
A wonderful study, published today in Nature Biotech.: NPM1 is a marker of AML and can be targeted for efficient therapy! @karimalmahayni.bsky.social created the first SR reconstructions of NPM1 on the cell surface. Great collaborative work, spearheaded by @raflynn5.bsky.social and Kostas Tzelepis!
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Reposted by Karim Almahayni 🍉
Nature Biotechnology @natbiotech.nature.com · 23/04/2025
Treatment of acute myeloid leukemia models by targeting a cell surface RNA-binding protein - @raflynn5.bsky.social go.nature.com/3YbT1In
go.nature.com
Treatment of acute myeloid leukemia models by targeting a cell surface RNA-binding protein - Nature Biotechnology
An RNA-binding protein on leukemia cells provides an effective target in mouse models.
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Karim Almahayni 🍉 @karimalmahayni.bsky.social · 23/04/2025
Happy to have contributed to this amazing story identifying cell surface NPM1 as a promising therapeutic strategy in acute myeloid leukaemia, check it out!
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Karim Almahayni 🍉 @karimalmahayni.bsky.social · 27/02/2025
Thrilled to be part of this masterpiece published today in CELL 🚀🔬!! Check it out!
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Reposted by Karim Almahayni 🍉
Carolyn Bertozzi @carolynbertozzi.bskyverified.social · 10/02/2025
This is an amazing achievement - angstrom scale imagine of glycan molecules, what a great time for #glycotime. Congrats Leonhard Möckl! www.biorxiv.org/content/10.1...
biorxiv.org
Angstrom-resolution imaging of cell-surface glycans
Glycobiology is rooted in the study of monosaccharides, Angstrom-sized molecules that are the building blocks of intricate glycosylation patterns. Glycosylated biomolecules form the glycocalyx, a dens...
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Reposted by Karim Almahayni 🍉
Leonhard Möckl @lmoeckl.bsky.social · 10/02/2025
ÅNGSTRÖM-RESOLUTION IMAGING OF CELL-SURFACE GLYCANS🍬🍬🍬 For the first time, we are able to image the molecular architecture of the glycocalyx at Ångström resolution. A dream come true! Read the preprint: biorxiv.org/content/10.110… And find our tweetorial below! #glycotime
biorxiv.org
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Karim Almahayni 🍉 @karimalmahayni.bsky.social · 11/02/2025
ÅNGSTRÖM-RESOLUTION IMAGING OF CELL-SURFACE GLYCANS 🍬🍭🔬 For the first time, we’re able to study the molecular architecture of the glycocalyx at single-sugar resolution—a longstanding challenge in glycobiology! #glycotime Preprint and #bluetorial below!!
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Reposted by Karim Almahayni 🍉
Wehner lab | Neuroregeneration @wehnerlab.bsky.social · 27/01/2025
Excited to share the latest work from our lab: www.biorxiv.org/content/10.1...
biorxiv.org
Biphasic inflammation control by dedifferentiated fibroblasts enables axon regeneration after spinal cord injury in zebrafish
Fibrosis and persistent inflammation are interconnected processes that inhibit axon regeneration in the mammalian central nervous system (CNS). In zebrafish, by contrast, fibroblast-derived extracellu...
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Reposted by Karim Almahayni 🍉
Max Planck Institute for the Science of Light (MPL) @mpi-scienceoflight.bsky.social · 17/01/2025
LIGHTs on for our Bluesky channel! 💡 Stay up to date with all the latest news from our research on the #science of #light and the institute! #sciencebluesky
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Karim Almahayni 🍉 @karimalmahayni.bsky.social · 17/01/2025
Our latest paper made the cover! 🎉 We developed a library of light-activated molecules designed for precise, localized induction of cell death in biological systems, characterized both in vitro and in vivo. Great collaboration with @wehnerlab.bsky.social Read more: pubs.acs.org/doi/full/10....
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