Dynamic actin-mediated nano-scale clustering of CD44 regulates its meso-scale organization at the plasma membrane

Transmembrane adhesion receptors at the cell surface, such as CD44, are often equipped with modules to interact with the extracellular matrix (ECM) and the intracellular cytoskeletal machinery. CD44 has been recently shown to compartmentalize the membrane into domains by acting as membrane pickets,...

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Bibliographic Details
Published in:Molecular biology of the cell 2020-03, Vol.31 (7), p.561-579
Main Authors: Sil, Parijat, Mateos, Nicolas, Nath, Sangeeta, Buschow, Sonja, Manzo, Carlo, Suzuki, Kenichi G N, Fujiwara, Takahiro, Kusumi, Akihiro, Garcia-Parajo, Maria F, Mayor, Satyajit
Format: Article
Language:English
Subjects:
Actins - metabolism
Actomyosin - metabolism
Animals
Cell Line
Cell Membrane - metabolism
Cytoplasm - metabolism
Diffusion
Formins - metabolism
Humans
Hyaluronan Receptors - chemistry
Hyaluronan Receptors - metabolism
Models, Biological
Nanoparticles - chemistry
Protein Domains
Single Molecule Imaging
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Summary:Transmembrane adhesion receptors at the cell surface, such as CD44, are often equipped with modules to interact with the extracellular matrix (ECM) and the intracellular cytoskeletal machinery. CD44 has been recently shown to compartmentalize the membrane into domains by acting as membrane pickets, facilitating the function of signaling receptors. While spatial organization and diffusion studies of membrane proteins are usually conducted separately, here we combine observations of organization and diffusion by using high spatio-temporal resolution imaging on living cells to reveal a hierarchical organization of CD44. CD44 is present in a meso-scale meshwork pattern where it exhibits enhanced confinement and is enriched in nanoclusters of CD44 along its boundaries. This nanoclustering is orchestrated by the underlying cortical actin dynamics. Interaction with actin is mediated by specific segments of the intracellular domain. This influences the organization of the protein at the nano-scale, generating a selective requirement for formin over Arp2/3-based actin-nucleation machinery. The extracellular domain and its interaction with elements of ECM do not influence the meso-scale organization, but may serve to reposition the meshwork with respect to the ECM. Taken together, our results capture the hierarchical nature of CD44 organization at the cell surface, with active cytoskeleton-templated nanoclusters localized to a meso-scale meshwork pattern.
ISSN:1059-1524
1939-4586
DOI:10.1091/mbc.e18-11-0715