Khaled_Selim Lab
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selimlab.bsky.social
Khaled_Selim Lab
@selimlab.bsky.social
Microbiology | Cell Signaling | Structural Biology | Institute of Phototrophic Microbiology @hhu.de
https://www.phototrophic-microbiology.hhu.de/en/

Central Metabolism Coordination by #PII & #cdiAMP & #cdiGMP & #Ca2+ signaling #Cyanobacteria
Pinned
We discovered a new family of c-di-NMP receptors, widespread in bacteria & regulating🦠motility @pnas.org

A great collab. w/ @mygalperin.bsky.social @vikramalva.bsky.social @thethormannden.bsky.social

www.pnas.org/doi/10.1073/...

@hhu.de @cmfi.bsky.social
@sfb1381.bsky.social
@mibinet.bsky.social
Reposted by Khaled_Selim Lab
Old and mighty: A novel cytosine nucleobase modification in phage genomic DNA renders the majority of restriction-based host defence systems useless. Great collaboration with the Bielefeld Gang. | Applied and Environmental Microbiology journals.asm.org/doi/10.1128/...
A pentose, as a cytosine nucleobase modification in Shewanella phage Thanatos genomic DNA, mediates enhanced resistance toward host restriction systems | Applied and Environmental Microbiology
Several phages extensively decorate their DNA building blocks, providing an effective protection against various host and phage-produced restriction systems. These modifications allow the phages to di...
journals.asm.org
December 29, 2025 at 9:44 AM
Reposted by Khaled_Selim Lab
Tiffany Zarrella et al. provide new insights into the role of the bacterial second messenger cyclic di-adenosine monophosphate (c-di-AMP) in maintaining cell envelope homeostasis in Streptococcus pneumoniae.
#MicroSky #cyclic-di-AMP
onlinelibrary.wiley.com/doi/10.1111/...
Cyclic Di‐AMP Affects Cell Membrane Integrity of Streptococcus pneumoniae
When Streptococcus pneumoniae produces low amounts of the second messenger cyclic di-AMP (c-di-AMP), they do not survive in the presence of competence-stimulating peptide (CSP), which is used for tra...
onlinelibrary.wiley.com
July 2, 2025 at 3:01 PM
Reposted by Khaled_Selim Lab
In Paneth cells, ERAdP senses c-di-AMP derived from intestinal microbiota, activating dense core vesicle biogenesis and AMP secretion to enhance intestinal defense
rupress.org/jem/article-... @jem.org
December 28, 2025 at 4:46 AM
Reposted by Khaled_Selim Lab
High-Throughput Detection of Cyanobacterial Form I Rubisco Assembly | ACS Synthetic Biology pubs.acs.org/doi/full/10....
High-Throughput Detection of Cyanobacterial Form I Rubisco Assembly
Rubisco catalyzes the CO2 fixation step in the dark reactions of photosynthesis. Transgenic expression of better-performing Rubisco orthologs in plants or discovery of improved mutants of Rubisco via ...
pubs.acs.org
December 27, 2025 at 9:07 AM
Reposted by Khaled_Selim Lab
When I quit Twitter/X, I made sure to delete 18 years of Tweets, because I knew this was coming.

If you’re still on that platform, you are enabling sooooo much disinformation.
Users are noticing Twitter/X has added a Grok-powered AI image editor that lets anyone edit any image on the platform, including other people’s artwork using text prompts.

Artists warn there’s no opt-out or consent, raising concerns over unauthorized edits and misuse.
December 25, 2025 at 5:26 PM
Reposted by Khaled_Selim Lab
The @science.org NOSTER microbiome prize is open for entries until 14th February. $25k top prize and essay published in Science. Open to researchers up to 10 years post PhD. See the website for further details
www.science.org/content/page...
🧪
NOSTER & Science Microbiome Prize
The NOSTER Science Microbiome Prize has been established to reward innovative research by young investigators working on the functional attributes of the microbiota of any organism that has potential ...
www.science.org
December 23, 2025 at 5:35 PM
Reposted by Khaled_Selim Lab
Essays in Biochemistry publishes themed issues looking at interesting, timely and relevant subjects from across the molecular biosciences. Interested in leading a themed issue? Then fill out our proposal form.🧪 https://ow.ly/xrh050XNAvV
December 23, 2025 at 11:00 AM
Reposted by Khaled_Selim Lab
We are looking for a team leader to join the cryo-EM facility work at the new Ernst Ruska-Centre 2.0 at the Forschungszentrum Jülich. We have a series of microscopes used by (@irene-vercellino.bsky.social, Schröder, @sachsegroup.bsky.social) and external users.
www.fz-juelich.de/de/karriere/...
Team Leader – Life Science Cryo-Electron Microscopy (Cryo-EM) Facility
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C) at Forschungszentrum Jülich houses some of the world`s most advanced electron microscopes and tools for nanocharacterisation. U...
www.fz-juelich.de
December 23, 2025 at 9:42 AM
The beauty of the art! 😍

www.sciencedirect.com/science/arti...
December 21, 2025 at 7:53 AM
Reposted by Khaled_Selim Lab
Take advantage of this fantastic opportunity to become part of the SCALE community! Several professorships and group leader positions are available at Goethe University and FIAS. We are looking for professors in the fields of molecular microbiology, cellular biochemistry, and molecular biochemistry.
⏰Call for Applications - Join Our Team and Help Shape Our Cluster

@goetheuni.bsky.social and the Cluster of Excellence SCALE - Subcellular Architecture of Life are seeking 3 highly motivated scientists to join a vibrant and innovative research community on Campus Riedberg.
Share with your network!
December 19, 2025 at 10:44 PM
New function for PII-like protein, PstA, in bacterial death....

Cyclic di-AMP inhibits Listeria monocytogenes thymineless death during infection

journals.asm.org/doi/10.1128/...
December 18, 2025 at 10:12 AM
Reposted by Khaled_Selim Lab
🥸 Aging of Escherichia coli!

Protein aggregation drives cell aging in a size-specific manner in E. coli!

👇

| mBio journals.asm.org/doi/10.1128/...

@mbio.bsky.social #coli #antiaging #aging
Protein aggregation drives cell aging in a size-specific manner in Escherichia coli | mBio
Among the simplest organisms known to age, Escherichia coli bacteria suffer a functional decline as misfolded proteins accumulate into aggregates retained by the mother cell upon division. This mechanism places the loss of proteostasis as a conserved hallmark of aging. However, subsequent studies found no deleterious effects of harboring aggregates. By quantifying single-cell fitness and damage dynamics, we found that it is not the mere presence of an aggregate that drives a fitness decline, but the intracellular space it occupies. Yet, aging cells undergo a gradual enlargement that could allow them to sustain stable growth despite harboring intracellular damage. Cell enlargement thus emerges as another cross-domain aging phenotype, but with curiously opposite effects: protective in bacteria, whereas generally deleterious in eukaryotes. Our findings, therefore, offer a connection between damage dynamics, aging, and cell size regulation at the single-cell level, while tracing new parallels between bacterial and eukaryotic aging.
journals.asm.org
December 18, 2025 at 7:37 AM
Reposted by Khaled_Selim Lab
How do simple cells make complex patterns? We discovered a key piece in cyanobacteria—an ancient enzyme repurposed to activate a pattern-forming signal. A conserved signaling strategy, showing how nature reuses tools to build multicellularity. www.cell.com/iscience/ful...
Co-option of an ancestral peptidase controls developmental patterning in multicellular cyanobacteria
Developmental biology
www.cell.com
December 17, 2025 at 8:44 AM
Reposted by Khaled_Selim Lab
Attention scientists from all over the world🙃
The Call for Letters of Intent for #HFSPResearchGrants 2027 is now open! 🧪
Get your international & interdisciplinary team. It's time to put your bold research idea into practice!
🔗https://bit.ly/48VsGCG
📅 15 Dec 2025–26 Mar 2026
#sts #LifeSciences
December 15, 2025 at 2:52 PM
Reposted by Khaled_Selim Lab
Happy to share that our work on HLp, a bacterial histone from Leptospira perolatii, is now published in Nature Communications 🎉

In this study, we show that HLp forms stable tetramers that wrap ~60 bp of DNA, revealing a distinct histone–DNA organization in bacteria.

www.nature.com/articles/s41...
December 13, 2025 at 8:09 AM
Reposted by Khaled_Selim Lab
📣Interested in doing your PhD in Plant Sciences 🌱, Microbial Sciences 🦠 or Computational Biology 👩‍💻? @ceplas.bsky.social offers 10 fully funded PhD 🎓fellowships. Pls repost and forward to interested candidates holding BSc degree.
December 11, 2025 at 8:34 AM
Reposted by Khaled_Selim Lab
🤯
December 11, 2025 at 11:10 PM
More than well deserved Mark!
I'm so happy for you!
NEWS - Professor Mark Buttner receives Marjory Stephenson Prize 2026

Professor Buttner, one of our Emeritus Fellows, has received the @microbiologysociety.org Marjory Stephenson Prize for 2026. Congratulations Mark! 👏

Read about his exceptional research and career: www.jic.ac.uk/news/profess...
December 11, 2025 at 8:49 PM
Reposted by Khaled_Selim Lab
We are recruiting a tenure track professor in the broader area of molecular biology @zmbh.uni-heidelberg.de at Heidelberg University! www.nature.com/naturecareer... Please share and apply!
Tenure Track Professorship (W1 with Tenure Track to W3) in “Molecular Biology" (f/m/d) - Heidelberg job with Universität Heidelberg | 12850668
The Center for Molecular Biology of Heidelberg University (ZMBH) and the Faculty of Biosciences invite applications for a   Tenure Track Professors...
www.nature.com
December 9, 2025 at 6:11 PM
Reposted by Khaled_Selim Lab
Confused by all the histones that are cropping up in organisms that are decidedly NOT eukaryotes? check out our review - fantastic work by team NucEvo in the #Lugerlab
The Expanding Histone Universe: Histone-Based DNA Organization in Noneukaryotic Organisms - www.annualreviews.org/content/jour...
December 9, 2025 at 3:14 PM
Reposted by Khaled_Selim Lab
‼️Please RT: The CEPLAS Graduate School call for 2026 is now open! Detailed info on our website: bit.ly/4q19JWk
@hhu.de @unicologne.bsky.social @mpipz.bsky.social @fz-juelich.de @leibnizipk.bsky.social @plantsciencedbg.bsky.social
December 9, 2025 at 2:42 PM
Come and join us at @ceplas.bsky.social for a structured #PhD program

A new call for PhD students
December 9, 2025 at 1:30 PM