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. 2022 Nov 24;29(12):1159–1169. doi: 10.1038/s41594-022-00857-w

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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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Extended Data Fig. 6 — a) 2D representation of the overview of BS3 crosslinks. The crosslinks correspond to inter-protein mono-links that have at least three crosslinked peptide-spectrum matches (CSM). The subunit colours are consistent with Fig. 2. b) Crosslinks as mapped to SNAPc containing Pol II PIC structure using Xlink analyzer² plugin in UCSF chimera. The inset show the crosslinks observed between SNAPc subunits and the GTFs’ TFIIA and TFIIB respectively. c) Histogram representing the distribution of Cα pair distances of unique crosslinks mapped to the structure. Dotted line indicates the 30 Å cut-off for BS3 crosslinked Cα pair. A total of 87.8% of the crosslinks were satisfied within this 30 Å cutoff.