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Reposted by Alice Ting

Jingchuan Luo @jingchuanluo.bsky.social · Aug 27

I'm thrilled to share our work from @weissmanlab.bsky.social (www.sciencedirect.com/science/arti...). We developed LOCL-TL, an optogenetic approach for monitoring localized translation in mammalian cells. LOCL-TL revealed two distinct strategies for mitochondrially localized translation.

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Alice Ting @aliceyting.bsky.social · Aug 27

LOV-BirA, light regulated biotin ligase, engineered by Song-Yi Lee

www.sciencedirect.com/science/arti...

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Alice Ting @aliceyting.bsky.social · Aug 27

Proximity-specific ribosome profiling using LOV-BirA reveals two distinct strategies for mitochondrially-localized translation: one for long coding sequences and one for short. It was a pleasure to contribute to this beautiful work from Jonathan Weissman @weissmanlab.bsky.social‬ and Jingchuan Luo

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Alice Ting @aliceyting.bsky.social · Aug 27

LOV-BirA, light regulated biotin ligase, engineered by Song-Yi Lee

www.sciencedirect.com/science/arti...

Alice Ting @aliceyting.bsky.social · Aug 27

LOV-BirA, light regulated biotin ligase, engineered by Song-Yi Lee

www.sciencedirect.com/science/arti...

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Reposted by Alice Ting

Nature Chemical Biology @natchembio.nature.com · Aug 1

A new paper from @aliceyting.bsky.social reports on LaccID, an engineered laccase, that enables hydrogen peroxide-free proximity labeling and electron microscopy of cell surfaces

www.nature.com/articles/s41...

Directed evolution of LaccID for cell surface proximity labeling and electron microscopy - Nature Chemical Biology

LaccID, an engineered laccase, enables hydrogen-peroxide-free proximity labeling and electron microscopy (EM) in mammalian cells. Notably, LaccID is selectively active at the cell surface, enabling th...

www.nature.com

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Alice Ting @aliceyting.bsky.social · Aug 18

Can a single researcher test over half a million chemical reactions in <3 days? Yes, using Jeff Martell’s new DNA-encoded combinatorial screening platform. Check out his lab’s exciting new preprint 👇

Jeff Martell @jeffmartell.bsky.social · Aug 14

Excited to share our new preprint, which was years in the making! chemrxiv.org/engage/chemr...
New reactions are typically developed by trial and error. How can we speed up this process? Read on to learn how we used DNA scaffolding to perform >500,000 parallel reactions on attomole scale.
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DNA-Scaffolded Ultrahigh-Throughput Reaction Screening

Discovering and optimizing reactions is central to synthetic chemistry. However, chemical reactions are traditionally screened using relatively low-throughput methods, prohibiting exploration of diver...

chemrxiv.org

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Alice Ting @aliceyting.bsky.social · Mar 26

subjects with at least 1 year of prior wetlab research experience. Must be a US citizen or have a valid work visa.

To apply: careersearch.stanford.edu/jobs/life-sc...

Life Science Research Professional 1 in School of Medicine, Stanford, California, United States

We seek motivated recent college graduates with substantial research experience who are looking for a launching pad into the next phase of their...

careersearch.stanford.edu

Alice Ting @aliceyting.bsky.social · Mar 26

keeping the lab running (being a lab manager), and 50% is for original research related to protein engineering, technology development, etc – there are many project possibilities!

Seeking passionate, motivated, creative, and detail-oriented majors in chemical biology, molecular biology or related..

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Alice Ting @aliceyting.bsky.social · Mar 26

We are hiring a new lab manager! Our wonderful lab manager Albert is headed off to grad school and we are looking to fill his position this summer. This is a great opportunity for a new graduate to spend a couple years immersed in research before applying to PhD or MD programs. 50% of the job is...

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Alice Ting @aliceyting.bsky.social · Feb 26

applications.

Congratulations to postdoc Rongbing Huang, whose creativity, persistence, and resourcefulness made rHUH possible! We are grateful to NSF and Biohub for funding this work.

www.pnas.org/doi/10.1073/pnas.2422085122

Directed evolution of a sequence-specific covalent protein tag for RNA labeling | PNAS

Efficient methods for conjugating proteins to RNA are needed for RNA delivery, imaging, editing, interactome mapping, and barcoding applications. N...

www.pnas.org

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Alice Ting @aliceyting.bsky.social · Feb 26

and imperfect sequence specificity resulting in significant background labeling of endogenous transcripts.

There is still work to do for this to be a dream tool for RNA imaging/editing/mapping in living cells, but rHUH provides a good starting point and it is definitely good enough for in vitro

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Alice Ting @aliceyting.bsky.social · Feb 26

library diversification.

The final rHUH tag is 13.4 kD, has 12 mutations relative to HUH, and covalently labels as little as 1 nM target RNA within minutes. The labeling works well in mammalian cell lysate, but not yet in the interior of living cells – possibly due to the high Mg2+ requirement

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Alice Ting @aliceyting.bsky.social · Feb 26

Today we report the directed evolution of HUH into rHUH, a sequence-specific covalent protein tag for RNA labeling. rHUH was hard to engineer: the initial HUH template had no RNA activity, so we started with RNA-DNA hybrids. 30 rounds of selection on the yeast surface were required, and 7 cycles of

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Alice Ting @aliceyting.bsky.social · Jan 31

There is no detectable toxicity in the dark state because the protease activity is completely shut off. After activation, LATeNT only cleaves VAMP2, inhibiting synaptic transmission, but it does not affect other pathways. It does not kill cells.

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Alice Ting @aliceyting.bsky.social · Jan 30

Yes we did a side by side comparison to PA-BoNT in Figure S7A and found that PA-BoNT showed much lower +light activity and higher dark-state background than LATeNT

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Alice Ting @aliceyting.bsky.social · Jan 30

Very proud of amazing protein engineer Heegwang Roh, our fantastic neuroscience collaborator Ji Won Um, co-first author Dongwook Kim from the Um lab, and our other wonderful co-authors.

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Alice Ting @aliceyting.bsky.social · Jan 30

effect are completely under your control.

Preprint here: www.biorxiv.org/content/10.1...

Light-activated tetanus neurotoxin for conditional proteolysis and inducible synaptic inhibition in vivo

The light chain of tetanus neurotoxin (TeNT) is a 52 kD metalloprotease that potently inhibits synaptic transmission by cleaving the endogenous vesicle fusion protein VAMP2. To mitigate the toxicity o...

www.biorxiv.org

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Alice Ting @aliceyting.bsky.social · Jan 30

24 hours after shutting off LATeNT by taking away the light, anxiety levels returned to normal.

We are excited for neuroscientists to try this new tool! The inhibitory effect is stronger and more sustained than with other tools like halorhodopsin and DREADDs, but the timing and location of the...

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Alice Ting @aliceyting.bsky.social · Jan 30

Synaptic inhibition is potently inhibited only in those cells expressing LATeNT while neighboring cells are unaffected.

We used LATeNT in the mouse brain to discover a new cell population (SST+ interneurons in the hippocampus) that modulates anxiety.

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Alice Ting @aliceyting.bsky.social · Jan 30

we fused a light-sensitive LOV domain from oat plants into tetanus’ protease domain and made its activity controllable by light.

LATeNT (for light-activated tetanus neurotoxin) can be expressed in specific cell populations, and then turned on with a brief pulse of blue light.

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Alice Ting @aliceyting.bsky.social · Jan 30

Tetanus on demand! (not for bioweapons, but for neuroscience research)

Tetanus toxin induces paralysis by using a protease to cleave VAMP2, a protein required for synaptic vesicle fusion and neurotransmitter release.

To harness this toxicity and use it as a beneficial tool for neuroscience,

Painting by Sir Charles Bell depicting opisthotonos, which can be caused by tetanus (1809)

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Alice Ting @aliceyting.bsky.social · Jan 9

...research labs that are part of the CZ Biohub network (including mine!).

See czbiohub.org/program-ssfc... to learn more and email me with any questions

Applications accepted on a rolling basis until March 27, 2025

Global Science Scholars Postdoctoral Fellowship Program SS-F

Apply for the new international postdoctoral fellowship program from the CZ Biohub Network and Stellar Science Foundation.

czbiohub.org

Alice Ting @aliceyting.bsky.social · Jan 9

Are you a Japanese student interested in a postdoctoral fellowship in the US? The Chan Zuckerberg Initiative has an exciting new fully-funded Global Science Scholars program to pair students who have received their undergraduate or doctoral degrees in Japan with US bioengineering and biomedical...

Global Science Scholars Postdoctoral Fellowship Program SS-F

Apply for the new international postdoctoral fellowship program from the CZ Biohub Network and Stellar Science Foundation.

czbiohub.org

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Alice Ting @aliceyting.bsky.social · Dec 4

activation migration, etc). This is discussed in the paper

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