Phosphatidylinositol 4,5-Bisphosphate Clusters the Cell Adhesion Molecule CD44 and Assembles a Specific CD44-Ezrin Heterocomplex, as Revealed by Small Angle Neutron Scattering

Khajeh, Jahan Ali; Ju, Jeong Ho; Gupta, Yogesh K.; Stanley, Christopher B.; Do, Changwoo; Heller, William T.; Aggarwal, Aneel K.; Callaway, David J.E.; Bu, Zimei

doi:10.1074/jbc.m114.589523

Title: Phosphatidylinositol 4,5-Bisphosphate Clusters the Cell Adhesion Molecule CD44 and Assembles a Specific CD44-Ezrin Heterocomplex, as Revealed by Small Angle Neutron Scattering

Journal Article · Thu Jan 08 00:00:00 EST 2015 · Journal of Biological Chemistry

DOI:https://doi.org/10.1074/jbc.m114.589523· OSTI ID:1185789

Khajeh, Jahan Ali ^[1]; Ju, Jeong Ho ^[1]; Gupta, Yogesh K. ^[2]; Stanley, Christopher B. ^[3]; Do, Changwoo ^[3]; Heller, William T. ^[3]; Aggarwal, Aneel K. ^[2]; Callaway, David J.E. ^[1]; Bu, Zimei ^[1]

City College of New York, NY (United States)
Icahn School of Medicine at Mount Sinai, New York, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The cell adhesion molecule CD44 regulates diverse cellular functions, including cell-cell and cell-matrix interaction, cell motility, migration, differentiation, and growth. In cells, CD44 co-localizes with the membrane-cytoskeleton adapter protein Ezrin, which links the CD44 assembled receptor signaling complexes to the cytoskeletal actin and organizes the spatial and temporal localization of signaling events. Here we report that the cytoplasmic tail of CD44 (CD44ct) is largely disordered and adopts an autoinhibited conformation, which prevents CD44ct from binding directly to activated Ezrin in solution. Binding to the signaling lipid phosphatidylinositol 4,5-biphosphlate (PIP2) disrupts autoinhibition in CD44ct, and activates CD44ct to associate with Ezrin. Further, using contrast variation small angle neutron scattering, we show that PIP2 mediates the assembly of a specific hetero-tetramer complex of CD44ct with Ezrin. This study reveals a novel autoregulation mechanism in the cytoplasmic tail of CD44 and the role of PIP2 in mediating the assembly of multimeric CD44ct-Ezrin complexes. We hypothesize that polyvalent electrostatic interactions are responsible for the assembly of multimeric PIP2-CD44-Ezrin complexes.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185789

Journal Information:: Journal of Biological Chemistry, Vol. 290, Issue 10; ISSN 0021-9258

Publisher:: American Society for Biochemistry and Molecular BiologyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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