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. 2022 Jul 22;13:4226. doi: 10.1038/s41467-022-31790-7

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© The Author(s) 2022

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 Cryo-EM density map of the Hep-P3 fibril. The fibril parameters including the length of half pitch (180° helical turn), helical rise and twist angle are indicated. The two protofilements are colored in blue and purple, respectively. Extra densities are displayed with the same threshold (0.008) as protein densities. Extra densities for heparin are colored in orange in the density map. No specified radius was used to plot around residues/heparin. b Cross-section view of the structural model fitted in the density map. The density map is the same map in (a) but restricted to areas within a 2 Å radius of the α-syn model, and then combined with the heparin densities in (a). c Cross-section view of the electrostatic potential surface of the Hep-P3 fibril. The heparin-binding sites are highlighted dash boxes. A surface potential color bar is shown. d Molecular docking of heparin into the extra densities. Heparin molecules are shown in sticks and colored in purple). Cross-section view is shown on the left. Side view is shown in boxes on the right.