6MGQ

ERAP1 in the open conformation bound to 10mer phosphinic inhibitor DG014

Summary for 6MGQ

• Entry DOI: 10.2210/pdb6mgq/pdb
• Related PRD ID: PRD_002326
• Descriptor: Endoplasmic reticulum aminopeptidase 1, Phosphinic inhibitor DG014, alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: inhibitor, aminopeptidase, immune system, hydrolase, hydrolase-inhibitor complex, hydrolase/inhibitor
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 6
• Total formula weight: 332958.36

Authors

Stern, L.J.,Maben, Z. (deposition date: 2018-09-14, release date: 2019-12-18, Last modification date: 2023-10-11)

Primary citation

Maben, Z.,Arya, R.,Georgiadis, D.,Stratikos, E.,Stern, L.J.
Conformational dynamics linked to domain closure and substrate binding explain the ERAP1 allosteric regulation mechanism.
Nat Commun, 12:5302-5302, 2021

PubMed Abstract: The endoplasmic-reticulum aminopeptidase ERAP1 processes antigenic peptides for loading on MHC-I proteins and recognition by CD8 T cells as they survey the body for infection and malignancy. Crystal structures have revealed ERAP1 in either open or closed conformations, but whether these occur in solution and are involved in catalysis is not clear. Here, we assess ERAP1 conformational states in solution in the presence of substrates, allosteric activators, and inhibitors by small-angle X-ray scattering. We also characterize changes in protein conformation by X-ray crystallography, and we localize alternate C-terminal binding sites by chemical crosslinking. Structural and enzymatic data suggest that the structural reconfigurations of ERAP1 active site are physically linked to domain closure and are promoted by binding of long peptide substrates. These results clarify steps required for ERAP1 catalysis, demonstrate the importance of conformational dynamics within the catalytic cycle, and provide a mechanism for the observed allosteric regulation and Lys/Arg528 polymorphism disease association.

PubMed: 34489420
DOI: 10.1038/s41467-021-25564-w

Experimental method

X-RAY DIFFRACTION (2.92 Å)