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. 2021 Jul 22;12:4469. doi: 10.1038/s41467-021-24715-3

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© The Author(s) 2021

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. 3 — a Side view of the L (upper panel) and P (lower panel) rings with one subunit colored rainbow. b Intersubunit interactions between a FlgH subunit (H₀) and its neighboring six FlgH subunits (H_±1, H_±2, H_±3). The segments of six neighboring FlgH subunits interacting with the subunit H₀ are labeled with their subunit ID and colored as: light green, interactions with the inner layer; light blue, interactions with the middle layer; and pink, interactions with the outer layer. c, d Top view of the P ring, showing the intersubunit interactions between FlgI (I₀) and its neighboring subunit (I_±1). e Hydrophobic interactions and a short anti-parallel β sheet formed by two neighboring FlgI-IR_L domains. f Two hydrophobic pockets (inner and outer pocket) formed by two neighboring FlgI-IR_U domains. Hydrophobic side chains are displayed in gray sticks in e and f. g Interactions between FlgH (H₀) and three FlgI (I₀, I_±1) subunits. The extended chain of FlgH in the outer layer form hydrophobic interactions with the inner and outer pockets formed by FlgI subunits. The position of I-18 of FlgI is indicated by a thin dashed line because it is behind Val-110. The boundary lines between FlgI subunits are indicated by thick dashed lines.