This is the OB domain from 26S proteasome regulatory subunit 7 (PRS7, also known as PSMC2, Rpt1 or MSS1), a component of the 19S proteasome cap [1-5]. These are one of six ATPases of the regulatory particle that form a heterohexameric ring. This domain mediates interactions with USP14 or Ubp6 [2,4].

1: Deep classification of a large cryo-EM dataset defines the conformational landscape of the 26S proteasome. Unverdorben P, Beck F, Sledz P, Schweitzer A, Pfeifer G, Plitzko JM, Baumeister W, Forster F; Proc Natl Acad Sci U S A. 2014;111:5544-5549. PMID:24706844

2: An atomic structure of the human 26S proteasome. Huang X, Luan B, Wu J, Shi Y; Nat Struct Mol Biol. 2016;23:778-785. PMID:27428775

3: Structural mechanism for nucleotide-driven remodeling of the AAA-ATPase unfoldase in the activated human 26S proteasome. Zhu Y, Wang WL, Yu D, Ouyang Q, Lu Y, Mao Y; Nat Commun. 2018;9:1360. PMID:29636472

4: Conformational Landscape of the p28-Bound Human Proteasome Regulatory Particle. Lu Y, Wu J, Dong Y, Chen S, Sun S, Ma YB, Ouyang Q, Finley D, Kirschner MW, Mao Y; Mol Cell. 2017;67:322-333. PMID:28689658

5: In Situ Structure of Neuronal C9orf72 Poly-GA Aggregates Reveals Proteasome Recruitment. Guo Q, Lehmer C, Martinez-Sanchez A, Rudack T, Beck F, Hartmann H, Perez-Berlanga M, Frottin F, Hipp MS, Hartl FU, Edbauer D, Baumeister W, Fernandez-Busnadiego R; Cell. 2018;172:696-705. PMID:29398115