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. 2022 Jun 14;41(18):e109990. doi: 10.15252/embj.2021109990

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© 2022 The Authors. Published under the terms of the CC BY NC ND 4.0 license

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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A, B
The figures focus on the cytoplasmic central opening of the proteins TqsA (A, brown) and YdiK (B, blue). Images on the left in both figures show the overall positioning of the opening in the pentameric complexes. The illustrations on the right represent distinct views of this region from three different directions.

C, D
Close views showing the hydrophobic interactions between two adjacent H1 helices, which are vital for maintaining the pentameric architecture of the AI‐2 exporters.

E
Structural superposition of TqsA and YdiK in specific regions of the proteins in order to highlight their structural deviations. Helical hairpins are shown on the left while H2, H4, and H5 on the right.