David McQuarrie
@davidmcquarrie.bsky.social
1.4K followers 440 following 41 posts
Postdoc in the Jaffrey lab at @WeillCornell.bsky.social @CornellUniversity.bsky.social former PhD in the Soller lab interested in RNA-binding proteins and RNA modifications; #RNA #RNAmodifications #Genetics 🧫🪰 #MolecularBiology #Evolution
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davidmcquarrie.bsky.social
Hi #RNAsky, I've made a much needed #RNA modifications starter pack!
Let me know if you’d like to be added or know someone who should be.
go.bsky.app/E7zXGSF
#RNAmodifications
RNA modifications
Join the conversation
go.bsky.app
Reposted by David McQuarrie
rivaselenarivas.bsky.social
Integrated prediction of RNA secondary structure jointly with 3D motifs and pseudoknots guided by evolutionary information.
@aakaran31.bsky.social and @rivaselenarivas.bsky.social

link.springer.com/article/10.1...
All-at-once RNA folding with 3D motif prediction framed by evolutionary information - Nature Methods
Structural RNAs exhibit a vast array of recurrent short three-dimensional (3D) elements found in loop regions involving non-Watson–Crick interactions that help arrange canonical double helices into tertiary structures. Here we present CaCoFold-R3D, a probabilistic grammar that predicts these RNA 3D motifs (also termed modules) jointly with RNA secondary structure over a sequence or alignment. CaCoFold-R3D uses evolutionary information present in an RNA alignment to reliably identify canonical helices (including pseudoknots) by covariation. Here we further introduce the R3D grammars, which also exploit helix covariation that constrains the positioning of the mostly noncovarying RNA 3D motifs. Our method runs predictions over an almost-exhaustive list of over 50 known RNA motifs (‘everything’). Motifs can appear in any nonhelical loop region (including three-way, four-way and higher junctions) (‘everywhere’). All structural motifs as well as the canonical helices are arranged into one single structure predicted by one single joint probabilistic grammar (‘all-at-once’). Our results demonstrate that CaCoFold-R3D is a valid alternative for predicting the all-residue interactions present in a RNA 3D structure. CaCoFold-R3D is fast and easily customizable for novel motif discovery and shows promising value both as a strong input for deep learning approaches to all-atom structure prediction as well as toward guiding RNA design as drug targets for therapeutic small molecules.
link.springer.com
Reposted by David McQuarrie
greenrat.bsky.social
Neat trick if you polycolonal ab's suck. Incubate them with fixed cells with a KO of your protein of interest, then spin. Protocol here: www.med.upenn.edu/markslab/ass...
I was amazed how well it worked on first try (I'm sure that I can completely eliminate unspecific bands)
#WesternBlot #cellsky
On the left - western blot of B16F10 cells wt and KO for CDK8. Our in house produced antibodies give a lot of unspecific bands. On the right same probes with antibodies preincubated with fixed CDK8 KO cells - there is a specific band and faint unspecific bands, which can be probably eliminated with increase of amount of KO cells.
Reposted by David McQuarrie
cyrilpedia.bsky.social
'm6A conversion is catalyzed by a multi-protein writer complex with only one catalytic subunit. So why is the m6A writer complex composed of so many ptns? This Unsolved Mystery explores the possible functions of the ptns of the m6A writer complex & discusses why it might require multiple subunits'
Why does the m6A writer complex require so many proteins?
Post-transcriptional gene regulation through m6A deposition is dysregulated in many diseases and is catalyzed by a multi-protein writer complex. This Unsolved Mystery investigates why the writer compl...
journals.plos.org
Reposted by David McQuarrie
Reposted by David McQuarrie
Reposted by David McQuarrie
twbredy.bsky.social
How do neurons deal with fitting large regulatory proteins into small spaces to control plasticity and memory? By generating micropeptides via local translation of circRNAs, of course! Here’s to shedding new light on the ‘dark’ proteome in the brain.

www.biorxiv.org/cgi/content/...
Local translation of circular RNAs is required for synaptic activity and memory
Circular RNAs (circRNAs) are enriched in synapses and implicated in cognitive processes, and recent studies have shown that circRNAs can encode micropeptides, which suggests that there may be novel sy...
www.biorxiv.org
Reposted by David McQuarrie
Reposted by David McQuarrie
cellpress.bsky.social
Scientists crafted glow-in-the-dark #succulents that recharge in sunlight. Injected with light-emitting phosphor, the plants can shine as bright as a small night light. cell.com/matter/fullt...

@cp-matter.bsky.social
#SCAU Shuting Liu & colleagues
Reposted by David McQuarrie
natureportfolio.nature.com
Why are some species widespread while others are found only in small, isolated areas? A study in Nature Communications shows that species with narrow ranges, and thus higher extinction risk, are often island-restricted, poor dispersers, and have evolved relatively recently. #evosky 🧪
Evolutionary age correlates with range size across plants and animals - Nature Communications
Why are some species widespread while others are found only in small, isolated areas? This study shows that species with narrow ranges, and thus higher extinction risk, are often island-restricted, poor dispersers, and have evolved relatively recently.
go.nature.com
Reposted by David McQuarrie
cyrilpedia.bsky.social
The paper
"N-glycans conceal the hypermodified uracil base acp3U, which we identified as immunostimulatory when exposed in RNA. Consistent with this, genetic deletion of an enzyme (DTWD2) that synthesizes acp3U abrogated innate immune activation by de-N-glycosylated small RNAs and apoptotic cells"
RNA N-glycosylation enables immune evasion and homeostatic efferocytosis - Nature
N-glycans on glycoRNAs prevent innate immune sensing of endogenous small RNAs, and the natural mechanism they use demonstrates how glycoRNAs exist on the cell surface and in the endosomal network with...
www.nature.com
Reposted by David McQuarrie
devoevomed.bsky.social
“These results highlight how adaptive phenotypes may be more mutationally accessible in coding sequences than promoters, especially when large effects are beneficial.”

Ha, take that Cis-Regulatory Paradigm! #DevoEvo #EvoDevo 🧪
Reposted by David McQuarrie
lucksmith.bsky.social
forgot to include link to our looooooooong miRNA hairpin saga. pls share with your miRNA geek friends and let us know what you think! in the meantime, here's a picture of stretch armstrong i pulled from the interweb.

www.cell.com/cell-reports...
Reposted by David McQuarrie
lucksmith.bsky.social
New #miRNA paper from Lai lab!! 🧬🔥

some think this field, despite recent Nobel to Ambros and Ruvkun, doesn't have much surprises left. but, do we EVEN KNOW WHAT a miRNA precursor LOOKS LIKE? we found some conserved miRNA hairpins up to 10x longer than suspected. this is mir-12, just bonkers! 1/n