THE cadherins mediate cell adhesion and play a fundamental role in normal development¹. They participate in the maintenance of proper cell–cell contacts: for example, reduced levels of epithelial cadherin (E-cadherin) correlate with increased invasiveness in many human tumour cell types^2,3. The cadherins typically consist of five tandemly repeated extracellular domains, a single membrane-spanning segment and a cytoplasmic region^4–6. The N-terminal extracellular domains mediate cell–cell contact⁷while the cytoplasmic region interacts with the cytoskeleton through the catenins⁸. Cadherins depend on calcium for their function: removal of calcium abolishes adhesive activity, renders cadherins vulnerable to proteases (reviewed in ref. 4) and, in E-cadherin, induces a dramatic reversible conformational change in the entire extracellular region⁹. We report here the X-ray crystal structure at 2.0 Å resolution of the two N-terminal extracellular domains of E-cadherin in the presence of calcium. The structure reveals a two-fold symmetric dimer, each molecule of which binds a contiguous array of three bridged calcium ions. Not only do the bound calcium ions linearize and rigidity the molecule, they promote dimerization. Although the N-terminal domain of each molecule in the dimer is aligned in a parallel orientation, the interactions between them differ significantly from those found in the neural cadherin (N-cadherin) N-terminal domain (NCD1) structure¹⁰. The E-cadherin dual-domain structure reported here defines the role played by calcium in the cadherin-mediated formation and maintenance of solid tissues.