@Dunn_Lab
Joined December 2018
  • Tweets94
  • Following72
  • Followers1K
Hi Folks, I don't plan on maintaining this account, but I'll leave it up for now. Instead, please consider joining us on Bluesky: @dunnlab.bsky.social
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New preprint! @vvachhar and @DejongMatt show that PDZ domains, innocuous-looking scaffolding domains that are enriched at cell-cell junctions, can exhibit striking forms of mechanosensitivity: biorxiv.org/content/10.1101/… (1/2)

PDZ Domains from the Junctional Proteins Afadin and ZO-1 Act as Mechanosensors

Intercellular adhesion complexes must withstand mechanical forces to maintain tissue cohesion, while also retaining the capacity for dynamic remodeling during tissue morphogenesis and repair. Most...

biorxiv.org
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This result suggests the presence of novel forms of mechanosensing at intercellular adhesion complexes, and more broadly that mechanically regulated protein-protein interactions may be more widely distributed than previously anticipated. (2/2)
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New paper! @clhueschen presents a mathematical model of flocking on arbitrary 2D surfaces. In addition to your favorite creature, the model can be applied to a broad range of problems in active matter physics, e.g. cytoskeletal flows in living cells. journals.aps.org/pre/abstrac…

Wildebeest herds on rolling hills: Flocking on arbitrary curved surfaces

The collective motion of animal herds and other biological systems sometimes takes place in an environment with a complex geometrical structure. In this paper, the authors study such active matter...

journals.aps.org
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We micropatterned lymphocytes on EM grids to facilitate cryo-FIB & cryo-ET, revealing networks of filaments on the Jurkat cell surface. Was awesome to work with @dr_slo on this side project during my postdoc in @Dunn_Lab! #teamtomo @AlveoleLab biorxiv.org/content/10.1101/…
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New preprint: @bri_zhong shows that pN forces can potentially activate latrophilin 3, an adhesion GPCR that regulates synaptic plasticity. A first step for the lab in understanding this fascinating class of signaling proteins. Congrats Brian! t.ly/ETL_
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#MotorsInQuarantine will feature @amywang01 from @Dunn_Lab and @MarkDodding. Join us tomorrow to discuss how actin links to cell-cell adhesions and kinesin-1 is folded into the lambda particle when not busy transporting cargo along microtubules. mechanochemistry.org/whatson…
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New paper! With the @HTSohLab, we show how single-molecule imaging can be used to to suppress background signal in sandwich-type immunoassays. Congrats and thanks to @AmaniHariri20, @SharonNewman0, and @steventan17 for a great project and collaboration. nature.com/articles/s41467-0…
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Just out: MBoC special issue on mechanobiology! Many thanks to @MattWelchLab and co-editors Dennis Discher, Valerie Weaver, @TheYapLab, and @murrell_lab for involving me in this project. molbiolcell.org

Molecular Biology of the Cell (MBoC)

molbiolcell.org
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New paper! @bri_zhong describes a new strategy for visualizing mechanical forces across proteins in cells. We hope this will be a useful tool for everyone interested in mechanobiology and are excited to build upon this work in the future. cell.com/cell-reports-method…

Facile detection of mechanical forces across proteins in cells with STReTCh

Zhong et al. describe STReTCh, a genetically encoded force-sensing module that provides a readout of molecular forces in biological systems. STReTCh relies on typical “fix-and-stain” immunofluoresc...

cell.com
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Excited to share that @cavankatenaugh (@OWeinerLab ), Jennifer Hill (@DavidGDrubin ) and I are organizing the 2022 edition of the Bay Area Cytoskeleton Symposium!
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Thanks to some good funding news, the lab is looking for postdocs for projects with @LabSkiniotis and Bill Weis (Stanford Struct. Bio.). We'll be exploring ideas I'm quite excited about at the interface of biophysics, cell, and structural biology. Please email for more details!
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New paper! @amywang01 describes the probable mechanism by which alpha-catenin, and likely related proteins, makes a force-sensitive catch bond with F-actin. Also, intriguing clues about the origins of cooperative actin binding. Congrats Amy! elifesciences.org/articles/8…

Mechanism of the cadherin–catenin F-actin catch bond interaction

Deleting the first helix of the α-catenin actin-binding domain results in a slip bond interaction between the cadherin–catenin complex and F-actin, such that the binding interaction is stable at low...

elifesciences.org
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New paper! @CaylaMMiller used a clever approach to extract the distribution of actin filament velocities in living cells. The data support a model of the actin cytoskeleton in which periods of mechanical equilibrium are interrupted by sudden jumps. (1/2) tinyurl.com/4sva4hnk
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The mathematical tools Cayla and @ElginKorkmazhan developed should be applicable to any situation where noisy single-molecule data are being fit to an underlying statistical distribution. Congrats, Cayla and Elgin! (2/2)
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New paper! tinyurl.com/459753ww This surprising finding suggests one way by which the cell generates stable linkages between the membrane and cytoskeleton while still allowing rapid cytoskeletal remodeling. Congrats @ElginKorkmazhan!
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PhDs and Postdocs: we are still accepting abstracts for the GRS on Signaling from Adhesion Receptors - we will be extending the deadline internally for abstract submission until 4/20! Please RT to spread the word! grc.org/signaling-by-adhesio…
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Tweetorial by Elgin on his recent paper that I tweeted about a few days ago. Please enjoy the awesome movies!
Elgin Korkmazhan@ElginKorkmazhan
12 Apr 2022
HOW do cells respond to being peeled off e.g. when you pinch yourself too hard? We find that once cells partly detach, newly extruded membrane tethers attached to the surface (e.g. retraction fibers) guide cells back to their original location tinyurl.com/mr3ajzsu 1/
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Catching up on tweeting recent lab publications: (Paper 2 of 2). @ElginKorkmazhan shows how cells recover from near disaster: tinyurl.com/2p8nr33r Epithelia frequently experience mechanical insults that can tear cells from the ECM. How do they cope with this challenge? (1/4)
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In collab. with Andrew Kennard (@askennard), Elgin shows that a similar process occurs in a zebrafish wounding model. (3/4)
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In conclusion, this trick allows cells to avoid total detachment (likely fatal) or being ripped in half (definitely fatal), analogous to a spider using a silk dragline to recover from a fall. Congrats, Elgin, on a fun and surprising story! (4/4)
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