The data represent the mean values of three independent assays with the error bars indicating the standard deviations. The binding affinity of DV1 dimer was decreased by DNX4, Y45A, Y121A, W252A, Y255A, or E288D. F87A, D171A, and F292A also attenuated the binding activity of DV1 dimer. The other mutants had little effect on DV1 dimer binding.