Abstract

Dorsoventral patterning in animal development is regulated by a morphogenetic gradient of Bone morphogenetic protein signalling, which is established by a set of proteins that are conserved from Drosophila to vertebrates. These include Chordin (Chd)/Short gastrulation, Xolloid/Tolloid and Twisted gastrulation. Here, we report the identification of a cell-surface component of this morphogenetic pathway. Prompted by the observation that Chd protein bound to the surface of certain cell lines with subnanomolar affinity, we identified two cell-surface proteins that bind to Chd, one of which corresponds to Integrin-?3. Integrin-?3 and Chd are co-expressed in the Xenopus embryo. Transfection of Integrin-?3 increased the binding of Chd to the cell surface, which was competed by an excess of soluble Integrin-?3. After binding to the cell surface, Chd was translocated into intracellular endocytic compartments in a temperature-dependent manner. We propose that Integrin-?3 may regulate the concentration of Chd protein in the extracellular space by endocytosis.