6WJN:
reference: Cryo-EM Reveals Unanchored M1-Ubiquitin Chain Binding at hRpn11 of the 26S Proteasome., Chen X, Dorris Z, Shi D, Huang RK, Khant H, Fox T, de Val N, Williams D, Zhang P, Walters KJ, Structure. 2020 Aug 5. pii: S0969-2126(20)30244-6. doi:, 10.1016/j.str.2020.07.011. PMID: 32783951

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