6XOS

CryoEM structure of human presequence protease in partial open state 1

Summary for 6XOS

• Entry DOI: 10.2210/pdb6xos/pdb
• EMDB information: 22278 22279 22280 22281 22282
• Descriptor: Presequence protease, mitochondrial (1 entity in total)
• Functional Keywords: partial open state, hydrolase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 1
• Total formula weight: 114901.46

Authors

Liang, W.G.,Zhao, M.,Tang, W. (deposition date: 2020-07-07, release date: 2021-07-07, Last modification date: 2024-05-15)

Primary citation

Liang, W.G.,Wijaya, J.,Wei, H.,Noble, A.J.,Mancl, J.M.,Mo, S.,Lee, D.,Lin King, J.V.,Pan, M.,Liu, C.,Koehler, C.M.,Zhao, M.,Potter, C.S.,Carragher, B.,Li, S.,Tang, W.J.
Structural basis for the mechanisms of human presequence protease conformational switch and substrate recognition.
Nat Commun, 13:1833-1833, 2022

PubMed Abstract: Presequence protease (PreP), a 117 kDa mitochondrial M16C metalloprotease vital for mitochondrial proteostasis, degrades presequence peptides cleaved off from nuclear-encoded proteins and other aggregation-prone peptides, such as amyloid β (Aβ). PreP structures have only been determined in a closed conformation; thus, the mechanisms of substrate binding and selectivity remain elusive. Here, we leverage advanced vitrification techniques to overcome the preferential denaturation of one of two ~55 kDa homologous domains of PreP caused by air-water interface adsorption. Thereby, we elucidate cryoEM structures of three apo-PreP open states along with Aβ- and citrate synthase presequence-bound PreP at 3.3-4.6 Å resolution. Together with integrative biophysical and pharmacological approaches, these structures reveal the key stages of the PreP catalytic cycle and how the binding of substrates or PreP inhibitor drives a rigid body motion of the protein for substrate binding and catalysis. Together, our studies provide key mechanistic insights into M16C metalloproteases for future therapeutic innovations.

PubMed: 35383169
DOI: 10.1038/s41467-022-29322-4

Experimental method

ELECTRON MICROSCOPY (3.7 Å)