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. 2021 Jan 11;11:277. doi: 10.1038/s41598-020-79489-3

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Crystal structure of the fungal cyanase decamer. (a) Overall structure of the Tl-Cyn decamer (top view). Each monomer is depicted in a different color. The side chains of Y14 are shown as sticks, pointing towards the center of the structure. The malonate (labeled Mal) and formate (labeled For) molecules bound to the active sites of the decamer are shown as sticks. The five-fold symmetry axis of the decamer is indicated with the black pentagon. (b) Overall structure of the Tl-Cyn decamer viewed after a 90° rotation around the horizontal axis. (c) Overall structure of the Tl-Cyn viewed after a 36° rotation around the vertical axis from panel (b). A two-fold axis of the decamer is indicated with the black oval. (d) Molecular surface of the Tl-Cyn decamer, viewed in the same orientation as in (a). (e) Omit F_o − F_c electron density at 2.2 Å resolution for malonate, contoured at 3 s. (f) Omit F_o − F_c electron density at 2.2 Å resolution for two formate molecules, contoured at 3σ. g, Overlay of the binding modes of malonate (black carbon atoms) and two formate molecules (gray carbon atoms).