Figure 2.
Structure of the Lgr4/R-spondin complex. A. Two orthogonal views of the ligand/receptor complex. Lgr4 is colored in blue and R-spondin, in magenta. The inserts are superimpositions of ligand-bound (blue) and unliganded (green) Lgr4. Secondary structure elements in R-spondin are labeled. B. The Lgr4/R-spondin complex with either Lgr4 (Left Panel) or R-spondin complex (Right Panel) are drawn as solvent accessible surfaces and color-coded by electrostatic surface potential. This panel illustrates the complementary-charged surfaces that constitute the Lgr4/R-spondin interface.
