3TXM:
reference: The proteasomal subunit Rpn6 is a molecular clamp holding the core and regulatory subcomplexes together., Pathare GR, Nagy I, Bohn S, Unverdorben P, Hubert A, Korner R, Nickell S, Lasker K, Sali A, Tamura T, Nishioka T, Forster F, Baumeister W, Bracher A, Proc Natl Acad Sci U S A. 2012 Jan 3;109(1):149-54. Epub 2011 Dec 20. PMID: 22187461

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