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Main intersubunit interactions within the EfPDT and DpNDT tetramers. Innermost core region of the main contacting interface between subunits of (a) EfPDT and (b) DpNDT, showing the principal cis interactions of the tetramers. (c) Close-up view of the two intersubunit disulfide bridges of DpNDT showing the 2mFo-DFc electron density map (1σ level). Trans intersubunit contacts in (d) DpNDT and in (e) EfPDT. Same color code as in Fig. 2 has been used.
