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. 2019 Apr 4;16:10. doi: 10.1186/s12977-019-0471-4

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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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Proposed structural model of the interaction of CypA with the hexameric CA lattice. a Top view of two neighboring hexamers (PDB: 4XFX) showing the location of CypA (cyan asterisk) bridging between two CA molecules. The CA subunits that are bridged by binding of CypA are highlighted in magenta. b Side view of a structural model obtained from all-atom molecular dynamics (MD) simulations of the CypA-CA complex in a helical assembly (PDB: 5FJB). CypA (cyan) binds to the CypA loops of two CA subunits (magenta, only the N-terminal domains are shown) via its canonical binding site (left) and proposed non-canonical binding site (right), respectively. Residues involved in binding at the non-canonical binding site and the cysteine residue (C51) used for site-specific labeling are indicated