We have included additional panels in Figure 3—figure supplement 1 that show the precise fusion protein sequence used for crystallization, as well as the highlighting the distances between the SNX5 C-terminus and the IncE N-terminus visible in our crystal structures. In each structure there are approximately 3-4 residues that are disordered and are not visible in the electron density, but the distances between the SNX5 C-termini and IncE N-termini are consistent with the expected linker lengths.