1
|
Wegner P, Drube J, Ziegler L, Strotmann B, Marquardt R, Küchler C, Groth M, Nieswandt B, Andreas N, Drube S. The Neurobeachin-like 2 protein (NBEAL2) controls the homeostatic level of the ribosomal protein RPS6 in mast cells. Immunology 2024; 172:61-76. [PMID: 38272677 DOI: 10.1111/imm.13756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/05/2024] [Indexed: 01/27/2024] Open
Abstract
The Beige and Chediak-Higashi (BEACH) domain-containing, Neurobeachin-like 2 (NBEAL2) protein is a molecule with a molecular weight of 300 kDa. Inactivation of NBEAL2 by loss-of-function mutations in humans as well as deletion of the Nbeal2 gene in mice results in functional defects in cells of the innate immune system such as neutrophils, NK-cells, megakaryocytes, platelets and of mast cells (MCs). To investigate the detailed function of NBEAL2 in murine MCs we generated MCs from wild type (wt) and Nbeal2-/- mice, and deleted Nbeal2 by CRISPR/Cas9 technology in the murine mast cell line MC/9. We also predicted the structure of NBEAL2 to infer its function and to examine potential mechanisms for its association with interaction partners by using the deep learning-based method RoseTTAFold and the Pymol© software. The function of NBEAL2 was analysed by molecular and immunological techniques such as co-immunoprecipitation (co-IP) experiments, western blotting, enzyme-linked immunosorbent assay and flow cytometry. We identified RPS6 as an interaction partner of NBEAL2. Thereby, the NBEAL2/RPS6 complex formation is probably required to control the protein homeostasis of RPS6 in MCs. Consequently, inactivation of NBEAL2 leads to accumulation of strongly p90RSK-phosphorylated RPS6 molecules which results in the development of an abnormal MC phenotype characterised by prolonged growth factor-independent survival and in a pro-inflammatory MC-phenotype.
Collapse
Affiliation(s)
- Philine Wegner
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Julia Drube
- Institut für Molekulare Zellbiologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Lisa Ziegler
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Birgit Strotmann
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Raphaela Marquardt
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Claudia Küchler
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Marco Groth
- CF Next-Generation Sequencing, Fritz Lipmann Institute, Jena, Germany
| | - Bernhard Nieswandt
- Institute of Experimental Biomedicine, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, Würzburg, Germany
| | - Nico Andreas
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| | - Sebastian Drube
- Institut für Immunologie, Friedrich-Schiller-Universität Jena, Universitätsklinikum Jena, Jena, Germany
| |
Collapse
|