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. 2019 Dec 12;9:18983. doi: 10.1038/s41598-019-55528-6

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© The Author(s) 2019

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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FXR1 (1-337) fragment demonstrates amyloid properties in the bacteria-based C-DAG system. (a) E.coli cells producing CsgAss-Sup35NM and CsgAss-FXR1(1-337) proteins form red colonies whereas cells producing CsgAss-Sup35M form pale colonies on agar plates containing CR. (b) Micrographs of CsgAss-Sup35NM, CsgAss-Sup35M and CsgAss-FXR1(1-337) scraped cell samples harvested from CR-containing agar. Extracellular material containing CsgAss-Sup35NM and CsgAss-FXR1(1-337) binds CR (upper panel) and displays yellow-green birefringence when viewed between crossed polarizers (lower panel). Scale bar, 100 μM (c) Secreted CsgAss-Sup35NM and CsgAss-FXR1(1-337) proteins form fibrils visualized by transmission electron microscopy. Scale bar, 1000 nM. The E. coli cells are seen as dark spots on the middle image.