ZYX

Zyxin (ZYX) is a LIM-domain cytoskeletal adaptor that localizes to mechanically loaded adhesion structures and stabilizes actin networks under tension, while also shuttling to the nucleus to couple mechanical input to gene expression (PMID:23427270, PMID:36384139). At focal adhesions it cooperates with VASP to assemble dense, uniformly polar actin bundles whose barbed ends orient toward the cell edge, defining a distinct layer of focal-adhesion architecture. In striated muscle its orthologue ZYX-1 concentrates at dense bodies/Z-discs and M-lines through interactions with α-actinin (ATN-1), vinculin (DEB-1), and the dystrophin-associated protein DYC-1, with localization dependent on α-actinin (PMID:18094057, PMID:23427270). Its tension-sensitive recruitment stabilizes junctional and synaptic F-actin against mechanical force during morphogenesis and at mechanosensory synapses, a function residing in the C-terminal LIM domains (PMID:25252943, PMID:36384139). Under oscillatory shear stress, endothelial zyxin acts as a mechanosensor that binds 14-3-3β to inhibit YAP Ser127 phosphorylation, promoting nuclear YAP translocation and inflammatory gene expression that drives atherosclerosis. Zyxin is embedded in cancer signaling as a transcriptionally regulated node acting downstream of ITGB1 through the FAK/AKT axis and upstream of STMN1 in tumor cell invasion (PMID:31949244, PMID:39143566). It also broadly restricts viral envelope fusion and entry across multiple virus families.

1. 2002 Medium

   Established the first molecular partners of a zyxin orthologue, linking the LIM-domain protein ZYX-1 to germline RNA helicases and hinting at functions beyond adhesion.

   Evidence Yeast two-hybrid screen and GST pull-down in C. elegans

   PMID:12435362

   Open questions at the time

   • Functional consequence of the GLH interaction not defined
   • Relevance to vertebrate zyxin unknown
2. 2007 Medium

   Placed ZYX-1 at the sarcomeric adhesion structure by mapping a short DYC-1 sequence sufficient for dense-body targeting, connecting zyxin to dystrophin-associated muscle architecture.

   Evidence Yeast two-hybrid, immunolocalization, and domain mapping in C. elegans muscle

   PMID:18094057

   Open questions at the time

   • Mechanical or signaling role at dense bodies not tested
   • No vertebrate confirmation
3. 2013 High

   Defined ZYX-1 as a dynamic, peripherally associated component of muscle dense bodies and Z-discs that depends on α-actinin and shuttles to the nucleus, suggesting a mechanotransduction role.

   Evidence Yeast two-hybrid, live imaging, FRAP, and isoform-specific genetics in C. elegans

   PMID:23427270

   Open questions at the time

   • Nuclear targets of shuttled ZYX-1 unidentified
   • Mechanism distinguishing the two isoforms incomplete
4. 2014 High

   Showed that zyxin stabilizes mechanosensory synapses against locomotion-induced force and localized this activity to the C-terminal LIM domains, separating force-stabilization from actin/α-actinin binding.

   Evidence Loss-of-function genetics, epistasis, and isoform rescue in C. elegans

   PMID:25252943

   Open questions at the time

   • Molecular partners of the LIM domains at synapses not identified
   • How LIM domains sense force not resolved
5. 2020 Medium

   Identified ZYX as a pro-invasive node in cancer, placing it upstream of STMN1 and demonstrating a tumor-suppressive ZYX-derived peptide that engages TSP1, revealing both full-length and fragment-level functions.

   Evidence Knockdown/overexpression with RNA-seq, proteomics, and rescue in glioblastoma; peptide pull-down and functional assays in ovarian cancer

   PMID:31949244 PMID:32953725

   Open questions at the time

   • Mechanism by which ZYX regulates STMN1 levels unknown
   • Physiological relevance of ZYX36-58 peptide unclear
6. 2022 High

   Demonstrated tension-dependent recruitment of zyxin to apical junctions and stress-fiber strain sites, establishing it as part of a force-sensitive system stabilizing junctional actin during morphogenesis.

   Evidence C. elegans genetics, imaging, epistasis with cadherin/catenin hypomorphs, and vertebrate stress-fiber strain-site recruitment assay

   PMID:36384139

   Open questions at the time

   • The force-sensing element within zyxin not molecularly defined
   • Link between junctional and focal-adhesion roles unresolved
7. 2024 Medium

   Connected zyxin mechanosensing to transcription by showing it binds 14-3-3β to relieve YAP Ser127 phosphorylation, driving nuclear YAP and endothelial inflammation in atherosclerosis.

   Evidence Endothelial-specific knockout ApoE−/− mouse, disturbed-flow system, and co-IP/phosphorylation studies (preprint)

   Open questions at the time

   • Preprint, not peer-reviewed
   • Direct binding of zyxin to 14-3-3β versus indirect effect not fully distinguished
8. 2024 Medium

   Positioned ZYX within the ITGB1/FAK/AKT signaling axis, showing it acts downstream of integrin β1 to drive EMT and suppress apoptosis in hepatocellular carcinoma.

   Evidence siRNA knockdown, overexpression rescue, xenograft, and pathway Western blots

   PMID:39143566

   Open questions at the time

   • Direct biochemical link between ZYX and FAK/AKT not shown
   • Whether effect requires zyxin's cytoskeletal localization untested
9. 2025 Medium

   Resolved the structural output of zyxin-VASP cooperation at focal adhesions, showing assembly of uniformly polar actin bundles and a layered focal-adhesion architecture.

   Evidence CRISPR/Cas9 knockout, cryo-electron tomography, and live-cell imaging (preprint)

   Open questions at the time

   • Preprint, not peer-reviewed
   • Order of zyxin and VASP recruitment to nascent bundles unresolved
10. 2025 Medium

    Revealed an unexpected broad antiviral function in which zyxin restricts viral envelope fusion and entry, potentially via effects on membrane properties.

    Evidence CRISPR/Cas9 knockout, cell-cell fusion and plaque assays, and bulk RNA-seq (preprint)

    Open questions at the time

    • Preprint, not peer-reviewed
    • Direct molecular mechanism linking zyxin to membrane fusion undefined
11. 2025 Medium

    Extended ZYX's regulatory range as a transcriptionally controlled node, identifying lncRNA/HNRNPC/RARA-driven activation of ZYX that suppresses prostate cancer invasion and a TGF-β/SMAD-coupled role in acinar cell ferroptosis.

    Evidence RIP, reporter/ChIP-type analysis, and rescue in prostate cancer; molecular docking and overexpression epistasis in a pancreatitis mouse model

    PMID:40414075 PMID:41134509

    Open questions at the time

    • Ferroptosis link rests partly on computational docking
    • Apparently opposite invasion effects across cancer contexts unreconciled

• How zyxin's mechanosensitive LIM domains physically sense force and how this single adaptor coordinates its adhesion, transcriptional, antiviral, and context-dependent cancer roles remains unresolved.
• No structural model of force-induced conformational change
• Unifying mechanism across diverse functions not established