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Substrate access and processing by the 20S proteasome core particle

Groll, Michael and Huber, Robert 2003. Substrate access and processing by the 20S proteasome core particle. The International Journal of Biochemistry & Cell Biology 35 (5) , pp. 606-616. 10.1016/S1357-2725(02)00390-4

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Intracellular proteolysis is an essential process. In eukaryotes, most proteins in the cytosol and nucleus are degraded by the ubiquitin (Ub)–proteasome pathway. A major component within this system is the 26S proteasome, a 2.5 MDa molecular machine, built from more than 31 different subunits. This complex is formed by a cylinder-shaped multimeric complex referred to as the proteolytic 20S proteasome (core particle, CP) capped at each end by another multimeric component called the 19S complex (regulatory particle, RP) or PA700. Structure, assembly and enzymatic mechanism have been elucidated only for the CP, whereas the organization of the RP is less well understood. The CP is composed of 28 subunits, which are arranged as an α7β7β7α7-complex in four stacked rings. The interior of the free core particle, which harbors the active sites, is inaccessible for folded and unfolded substrates and represents a latent state. This inhibition is relieved upon binding of the RP to the CP by formation of the 26S proteasome holoenzyme. This review summarizes the current knowledge of the structural features of 20S proteasomes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 1357-2725
Last Modified: 24 Jun 2017 11:00

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