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Zur Lage P, Stefanopoulou P, Styczynska-Soczka K, Quinn N, Mali G, von Kriegsheim A, Mill P, Jarman AP. Ciliary dynein motor preassembly is regulated by Wdr92 in association with HSP90 co-chaperone, R2TP. J Cell Biol 2018; 217:2583-2598. [PMID: 29743191 PMCID: PMC6028525 DOI: 10.1083/jcb.201709026] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 02/21/2018] [Accepted: 04/06/2018] [Indexed: 01/12/2023] Open
Abstract
Wdr92 is associated with the multifunctional cochaperone, R2TP, but its function is unknown. In this study, the authors show that Drosophila Wdr92 is exclusively required for preassembly of ciliary dynein motor complexes, which are confined to sensory neuron ciliary dendrites and sperm flagella. Wdr92 is proposed to direct R2TP/HSP90 to dynein chain clients to chaperone cytoplasmic preassembly. The massive dynein motor complexes that drive ciliary and flagellar motility require cytoplasmic preassembly, a process requiring dedicated dynein assembly factors (DNAAFs). How DNAAFs interact with molecular chaperones to control dynein assembly is not clear. By analogy with the well-known multifunctional HSP90-associated cochaperone, R2TP, several DNAAFs have been suggested to perform novel R2TP-like functions. However, the involvement of R2TP itself (canonical R2TP) in dynein assembly remains unclear. Here we show that in Drosophila melanogaster, the R2TP-associated factor, Wdr92, is required exclusively for axonemal dynein assembly, likely in association with canonical R2TP. Proteomic analyses suggest that in addition to being a regulator of R2TP chaperoning activity, Wdr92 works with the DNAAF Spag1 at a distinct stage in dynein preassembly. Wdr92/R2TP function is likely distinct from that of the DNAAFs proposed to form dynein-specific R2TP-like complexes. Our findings thus establish a connection between dynein assembly and a core multifunctional cochaperone.
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Affiliation(s)
- Petra Zur Lage
- Centre for Discovery Brain Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, Scotland, UK
| | - Panagiota Stefanopoulou
- Centre for Discovery Brain Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, Scotland, UK
| | - Katarzyna Styczynska-Soczka
- Centre for Discovery Brain Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, Scotland, UK
| | - Niall Quinn
- Edinburgh Cancer Research UK Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, UK
| | - Girish Mali
- Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, UK
| | - Alex von Kriegsheim
- Edinburgh Cancer Research UK Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, UK.,Systems Biology Ireland, University College Dublin, Belfield, Dublin, Ireland
| | - Pleasantine Mill
- Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, Scotland, UK
| | - Andrew P Jarman
- Centre for Discovery Brain Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, Scotland, UK
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