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Related Concept Videos

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Septins are protein filaments forming the cytoskeleton along with the microtubules, microfilaments, intermediate filaments, and other accessory proteins. In 1971 while studying the cell division cycle in mutant Saccharomyces cerevisiae Harwell et al. first identified the septin-related genes playing a crucial role in yeast cytokinesis. Fluorescence microscopy revealed that these proteins localize at the budding neck as rings. These ring-like proteins were then named Septins by John Pringle, and...
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Updated: Jun 23, 2025

Measuring Properties of the Membrane Periodic Skeleton of the Axon Initial Segment using 3D-Structured Illumination Microscopy 3D-SIM
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Spectrin condensates provide a nidus for assembling the periodic axonal structure.

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    Biomolecular condensation drives the formation of periodic axonal structures (PAS) in neurons. This process involves spectrin and adducin forming focal patches that assemble into a stable lattice, crucial for cytoskeletal organization.

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    Area of Science:

    • Cell Biology
    • Neuroscience
    • Biophysics

    Background:

    • Coordinated assembly of biological components into complex structures is fundamental but poorly understood.
    • The precise mechanism for the formation of the periodic axonal structure (PAS) in neurons, composed of spectrins, adducin, and actin filaments, remains unclear.

    Purpose of the Study:

    • To elucidate the mechanistic events underlying the assembly of the periodic axonal structure (PAS) in neurons.
    • To investigate the potential role of biomolecular condensation in the formation of neuronal cytoskeletal structures.

    Main Methods:

    • Live imaging of PAS components during axonal development in neurons.
    • Biophysical characterization of focal patches observed in developing axons.
    • Heterologous cell expression systems to study spectrin-repeat-induced condensation.
    • Genetic manipulation in neurons to disrupt spectrin-actin-membrane interactions.

    Main Results:

    • Focal patches with biomolecular condensation properties, containing spectrins and adducin, were identified in distal axons.
    • Overexpression of spectrin-repeats induced condensate formation in heterologous cells.
    • Disruption of spectrin association with actin/membranes promoted condensation.
    • Overexpression of spectrin-repeats in neurons interfered with PAS lattice formation.

    Conclusions:

    • Biomolecular condensation is proposed as a key mechanism for initiating PAS assembly, forming focal condensates that mature into a lattice.
    • This condensation-assembly model suggests a broader role for biomolecular condensation in constructing intricate cytoskeletal structures by creating local depots of assembly components.