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. 2020 Apr 27;11:2041. doi: 10.1038/s41467-020-15736-5

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — a Tomographic slices showing F6 and F7 stage 1 chemosensory arrays in the same P. aeruginosa cell (left) and an F7 stage 5 chemosensory array in E. coli (right). Over the course of evolution, the F6 system is lost and the F7 system evolves similar ultrastructure and function to the F6 system. Features to identify chemoreceptors are highlighted: periplasmic domain (PD), inner membrane (IM), and CheA/CheW layer (AW). b Molecular models of F7 chemosensory arrays in P. aeruginosa (left) and E. coli (right) built based on^64,65. Proteins displayed in this representation are: CheA (A), CheB(B), CheR(R), CheD(D), F7-CheY (Y₇), F6-like CheY (Y₆), and F6-like CheZ (Z₆). Models are colored according to their hypothetical original class: F7 (red) and F6 (yellow). c Working model of the evolution of the F7 chemosensory system in γ-proteobacteria and β-proteobacteria. Scale bars are 50 nm.