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Pang YP, Casal Moura M, Thompson GE, Nelson DR, Hummel AM, Jenne DE, Emerling D, Volkmuth W, Robinson WH, Specks U. Remote Activation of a Latent Epitope in an Autoantigen Decoded With Simulated B-Factors. Front Immunol 2019; 10:2467. [PMID: 31708920 PMCID: PMC6823208 DOI: 10.3389/fimmu.2019.02467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 10/03/2019] [Indexed: 11/13/2022] Open
Abstract
Mutants of a catalytically inactive variant of Proteinase 3 (PR3)—iPR3-Val103 possessing a Ser195Ala mutation relative to wild-type PR3-Val103—offer insights into how autoantigen PR3 interacts with antineutrophil cytoplasmic antibodies (ANCAs) in granulomatosis with polyangiitis (GPA) and whether such interactions can be interrupted. Here we report that iHm5-Val103, a triple mutant of iPR3-Val103, bound a monoclonal antibody (moANCA518) from a GPA patient on an epitope remote from the mutation sites, whereas the corresponding epitope of iPR3-Val103 was latent to moANCA518. Simulated B-factor analysis revealed that the binding of moANCA518 to iHm5-Val103 was due to increased main-chain flexibility of the latent epitope caused by remote mutations, suggesting rigidification of epitopes with therapeutics to alter pathogenic PR3·ANCA interactions as new GPA treatments.
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Affiliation(s)
- Yuan-Ping Pang
- Computer-Aided Molecular Design Laboratory, Mayo Clinic, Rochester, MN, United States
| | - Marta Casal Moura
- Thoracic Disease Research Unit, Mayo Clinic, Rochester, MN, United States
| | - Gwen E Thompson
- Thoracic Disease Research Unit, Mayo Clinic, Rochester, MN, United States
| | - Darlene R Nelson
- Thoracic Disease Research Unit, Mayo Clinic, Rochester, MN, United States
| | - Amber M Hummel
- Thoracic Disease Research Unit, Mayo Clinic, Rochester, MN, United States
| | - Dieter E Jenne
- Comprehensive Pneumology Center, Helmholtz Zentrum München & Max-Planck Institute for Neuroimmunology, Martinsried, Germany
| | | | | | - William H Robinson
- Department of Medicine, Stanford University, Palo Alto, CA, United States
| | - Ulrich Specks
- Thoracic Disease Research Unit, Mayo Clinic, Rochester, MN, United States
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