Fig. 1

Structure of the Irga6 dimer. a Schematic view of the domain architecture of mouse Irga6. The first and last amino acids of each domain are indicated. b Ribbon-type representation of the Irga6 dimer. In the left molecule, domains are colored according to the domain architecture, the right molecule is colored in grey. The nucleotide and Mg²⁺ ion (green) are shown in sphere representation. The GTPase domain dimer is boxed. The dotted line indicates a 2-fold axis. Secondary structure was numbered according to ref. [23]. c Top view on the GTPase domain dimer. d Magnification of the contact sites. Dotted lines indicate interactions. e Superposition of different switch I conformations in the asymmetric unit; the same colors as in Additional file 1: Figure S2 are used for the switch I regions of the individual subunits. Switch I residues of subunit A (yellow) involved in ribose binding are labelled and shown in stick representation. Irga6 immunity-related GTPase 6