Cadherin Diffusion in Supported Lipid Bilayers Exhibits Calcium-Dependent Dynamic Heterogeneity

Yu Cai, Nitesh Shashikanth, Deborah E. Leckband, Daniel K. Schwartz

Research output: Contribution to journalArticle

Abstract

Ca2+ ions are critical to cadherin ectodomain rigidity, which is required for the activation of adhesive functions. Therefore, changes in Ca2+ concentration, both in vivo and in vitro, can affect cadherin conformation and function. We employed single-molecule tracking to measure the diffusion of cadherin ectodomains tethered to supported lipid bilayers at varying Ca2+ concentrations. At a relatively high Ca2+ concentration of 2 mM, cadherin molecules exhibited a fast diffusion coefficient that was identical to that of individual lipid molecules in the bilayer (Dfast ≈ 3 μm2/s). At lower Ca2+ concentrations, where cadherin molecules were less rigid, the ensemble-average cadherin diffusion coefficient was systematically smaller. Individual cadherin trajectories were temporally heterogeneous, exhibiting alternating periods of fast and slow diffusion; the periods of slow diffusion (Dslow ≈ 0.1 μm2/s) were more prevalent at lower Ca2+ concentration. These observations suggested that more flexible cadherin ectodomains at lower Ca2+ concentration alternated between upright and lying-down conformations, where the latter interacted with more lipid molecules and experienced greater viscous drag.

Original languageEnglish (US)
Pages (from-to)2658-2665
Number of pages8
JournalBiophysical journal
Volume111
Issue number12
DOIs
StatePublished - Dec 20 2016

ASJC Scopus subject areas

  • Biophysics

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