Abstract
Abstract We have studied the effects of various PDB-causing mutations of SQSTM1 on the in vitro ubiquitin-binding properties of the p62 protein. All mutations caused loss of monoubiquitin-binding and impaired K48-linked polyubiquitin-binding, which was only evident at physiological temperature. This suggests that SQSTM1 mutations predispose to PDB through a common mechanism that depends on loss of ubiquitin-binding by p62. Introduction: Mutations in the SQSTM1 gene, which affect the ubiquitin-associated (UBA) domain of the p62 protein, are a common cause of Paget's disease of bone (PDB). We previously showed that the isolated UBA domain of p62 binds K48-linked polyubiquitin chains in vitro and that PDB-causing mutations in the UBA domain can be resolved in to those which retain (P392L and G411S) or lose (M404V and G425R) the ability to bind K48-linked polyubiquitin. To further clarify the mechanisms by which these mutations predispose to PDB, we have extended these analyses to study the ubiquitin-binding properties of the PDB-causing mutations in the context of the full-length p62 protein. Materials and Methods: We studied the effects of various PDB-causing mutations on the interaction between glutathione S-transferase (GST)-tagged p62 proteins and monoubiquitin, as well as K48-linked polyubiquitin chains, using in vitro ubiquitin-binding assays. Results: All of the PDB-causing mutations assessed (P392L, E396X, M404V, G411S, and G425R) caused loss of monoubiquitin binding and impaired K48-linked polyubiquitin-binding when introduced into the full-length p62 protein. However, these effects were only observed when the binding experiments were conducted at physiological temperature (37°C); they were not seen at room temperature or at 4°C. Conclusions: Our in vitro findings suggest that PDB-causing mutations of SQSTM1 could predispose to disease through a common mechanism that is dependent on impaired binding of p62 to a ubiquitylated target and show that 5q35-linked PDB is the first example of a human disorder caused by loss of function mutations in a UBA domain.
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Dates
Type | When |
---|---|
Created | 19 years, 4 months ago (April 27, 2006, 3:54 a.m.) |
Deposited | 1 year, 5 months ago (March 13, 2024, 11:07 a.m.) |
Indexed | 1 month, 4 weeks ago (July 7, 2025, 5:26 a.m.) |
Issued | 20 years, 5 months ago (April 1, 2005) |
Published | 20 years, 5 months ago (April 1, 2005) |
Published Online | 15 years, 9 months ago (Dec. 4, 2009) |
Published Print | 20 years, 5 months ago (April 1, 2005) |
@article{Cavey_2005, title={Loss of Ubiquitin-Binding Associated With Paget’s Disease of Bone p62 (SQSTM1) Mutations}, volume={20}, ISSN={1523-4681}, url={http://dx.doi.org/10.1359/jbmr.041205}, DOI={10.1359/jbmr.041205}, number={4}, journal={Journal of Bone and Mineral Research}, publisher={Oxford University Press (OUP)}, author={Cavey, James R and Ralston, Stuart H and Hocking, Lynne J and Sheppard, Paul W and Ciani, Barbara and Searle, Mark S and Layfield, Robert}, year={2005}, month=apr, pages={619–624} }