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Cartoon (a) and topology (b) representation of ECH from T. thermophilus HB8. (c) Top view. The threefold axis is perpendicular to the paper. The N-terminal globular domain is shown in surface representation and the trimerization domain is shown in ribbon representation, with helices α10–α12 labelled. (a) and (c) were made using PyMOL (DeLano, 2002 ▸). The topology diagram of the TtECH structure was made using Pro-origami (Stivala et al., 2011 ▸).
