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. 2020 Feb 28;10:3731. doi: 10.1038/s41598-020-60617-y

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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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Asc-1 Interactions observed in the “transition” state. (a) 2D diagram of interactions between d-serine and Asc-1. (b) Monitoring of the distance (Å) between the carbon of d-serine carboxylate group and the oxygen of the Tyr333 hydroxyl group (d₁, green), between the d-serine nitrogen and Asn52 main chain oxygen (d₂, blue), between d-serine side chain oxygen and Phe243 main chain oxygen (d₃, orange), between the carbon of d-serine side chain and centroid of Phe243 phenyl ring (d₄, red). (c) Snapshot of MD simulation at 84 ns showing a “transition” state conformation with d1-d4 distances indicated.