The structure of Tse3 and its catalytic domain in comparison with representative structures containing the SLT domain (PF01464 in the Pfam database). (a) Ribbon model of the overall structure of Tse3. The N-terminal domain and the C-terminal catalytic domain are coloured red and cyan, respectively, while the linker segment is shown in yellow. The loop that is not visible in the electron-density map (residues 13–19) is schematically represented by a green dashed curve. (b) Ribbon diagram of the C-terminal SLT-like domain of Tse3. (c–g) Representative SLT domains of the lytic transglycosylases MltE (PDB entry 2y8p
) (c), Slt35 (PDB entry 1qus
) (f) and Slt70 (PDB entry 1qsa
) (g) from E. coli and the goose-type lyzosymes from goose egg (PDB entry 153l
) (d) and Atlantic cod (PDB entry 3gxr
) (e). Catalytic glutamic acids and metal ions are highlighted as stick models and magenta spheres, respectively.