7W71

Crystal structure of the PDZ-C domain of E. coli RseP in complex with 12C7 Fab

Summary for 7W71

• Entry DOI: 10.2210/pdb7w71/pdb
• Descriptor: Regulator of sigma-E protease RseP, Heavy chain of Fab, Light chain of Fab (3 entities in total)
• Functional Keywords: intramembrane protease, hydrolase, hydrolase-immune system complex, hydrolase/immune system
• Biological source: Escherichia coli; More
• Total number of polymer chains: 6
• Total formula weight: 113722.73

Authors

Hirose, T.,Katagiri, S.,Nogi, T. (deposition date: 2021-12-02, release date: 2022-09-07, Last modification date: 2024-10-30)

Primary citation

Imaizumi, Y.,Takanuki, K.,Miyake, T.,Takemoto, M.,Hirata, K.,Hirose, M.,Oi, R.,Kobayashi, T.,Miyoshi, K.,Aruga, R.,Yokoyama, T.,Katagiri, S.,Matsuura, H.,Iwasaki, K.,Kato, T.,Kaneko, M.K.,Kato, Y.,Tajiri, M.,Akashi, S.,Nureki, O.,Hizukuri, Y.,Akiyama, Y.,Nogi, T.
Mechanistic insights into intramembrane proteolysis by E. coli site-2 protease homolog RseP.
Sci Adv, 8:eabp9011-eabp9011, 2022

PubMed Abstract: Site-2 proteases are a conserved family of intramembrane proteases that cleave transmembrane substrates to regulate signal transduction and maintain proteostasis. Here, we elucidated crystal structures of inhibitor-bound forms of bacterial site-2 proteases including RseP. Structure-based chemical modification and cross-linking experiments indicated that the RseP domains surrounding the active center undergo conformational changes to expose the substrate-binding site, suggesting that RseP has a gating mechanism to regulate substrate entry. Furthermore, mutational analysis suggests that a conserved electrostatic linkage between the transmembrane and peripheral membrane-associated domains mediates the conformational changes. In vivo cleavage assays also support that the substrate transmembrane helix is unwound by strand addition to the intramembrane β sheet of RseP and is clamped by a conserved asparagine residue at the active center for efficient cleavage. This mechanism underlying the substrate binding, i.e., unwinding and clamping, appears common across distinct families of intramembrane proteases that cleave transmembrane segments.

PubMed: 36001659
DOI: 10.1126/sciadv.abp9011

Experimental method

X-RAY DIFFRACTION (3.2 Å)