Extended Data Fig. 6: Interactions of the linker proteins L_Rγs and L_RCs with chromophores in the rod Rd.

a, Bottom, overall structure of the rod Rd with the hexamers shown in surface representation and the linker proteins shown in cartoon representation. Top, structure of the layer Rd3I. Proteins and bilins are shown in cartoon and sphere representations, respectively. Three β subunits are coloured differently and the β82 PEBs are boxed and analysed in detail in b–d. b, The interactions between the residue Y63 and the bilin \({{\rm{\gamma }}}_{{{\rm{L}}}_{{\rm{R}}}{\rm{\gamma }}5}^{135}\) from L_Rγ5 with the bilin \({}^{{\rm{Rd3I}}}{{\rm{\beta }}}_{2}^{82}\). c, The interaction between F122 from L_Rγ5 and the bilin \({}^{{\rm{Rd3I}}}{{\rm{\beta }}}_{1}^{82}\). d, The interaction between F107 from L_Rγ5 and the bilin \({}^{{\rm{Rd3I}}}{{\rm{\beta }}}_{3}^{82}\). e, A focused view of the structure of the layer Rd1I showing the central triangle area. PBPs, the linker protein, bilins and residues are shown in surface, cartoon, ball-and-stick and stick representations, respectively. Three β82 PCBs are boxed and analysed in detail in f–h. f, The interactions between Y201 and F207 from L_RC2 and the bilin \({}^{{\rm{Rd1I}}}{{\rm{\beta }}}_{2}^{82}\). g, The interaction between Y90 from L_RC2 and the bilin \({}^{{\rm{Rd1I}}}{{\rm{\beta }}}_{1}^{82}\). h, The interaction between Y137 from L_RC2 and the bilin \({}^{{\rm{Rd1I}}}{{\rm{\beta }}}_{3}^{82}\).