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. 2019 Nov 23;11(2):124–137. doi: 10.1007/s13238-019-00671-z

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Overall structure ofMtEccC-ATPase₃. (A) Domain arrangements of EccC proteins from Mycobacterium tuberculosis. (B) Cartoon and surface representation for MtEccCb1-ATPase₃. The helices and beta-sheets are colored cyan and magenta, respectively. ATP and the magnesium ion, are shown in stick representation and as a sphere, respectively. (C) Cartoon representation of MtEccCb1-ATPase₃ (C1A3, pale green), MtEccC2-ATPase₃ (C2A3, light blue), MtEccC3-ATPase₃ (C3A3, salmon) and MtEccC5-ATPase₃ (C5A3, pink). (D) Superposition of the four structures in (C). Structures of the four variable regions (V1–V4) are marked with circles. (E) Close-up views of the four variable regions in (D)