Allosteric modulation of the Lon protease via ssDNA binding and local charge changes.
| Autor: | Ogdahl JL; Department of Biochemistry and Molecular Biology, Molecular and Cellular Biology Program, University of Massachusetts, Amherst, USA., Chien P; Department of Biochemistry and Molecular Biology, Molecular and Cellular Biology Program, University of Massachusetts, Amherst, USA. Electronic address: pchien@umass.edu. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of biological chemistry [J Biol Chem] 2024 Nov 13; Vol. 301 (1), pp. 107993. Date of Electronic Publication: 2024 Nov 13. |
| DOI: | 10.1016/j.jbc.2024.107993 |
| Abstrakt: | The ATPase Associated with diverse cellular Activities (AAA+) family of proteases play crucial roles in cellular proteolysis and stress responses. Like other AAA + proteases, the Lon protease is known to be allosterically regulated by nucleotide and substrate binding. Although it was originally classified as a DNA binding protein, the impact of DNA binding on Lon activity is unclear. In this study, we characterize the regulation of Lon by single-stranded DNA (ssDNA) binding and serendipitously identify general activation strategies for Lon. Upon binding to ssDNA, Lon's ATP hydrolysis rate increases due to improved nucleotide binding, leading to enhanced degradation of protein substrates, including physiologically important targets. We demonstrate that mutations in basic residues that are crucial for Lon's DNA binding not only reduce ssDNA binding but result in charge-specific consequences on Lon activity. Introducing negative charge at these sites induces activation akin to that induced by ssDNA binding, whereas neutralizing the charge reduces Lon's activity. Based on single molecule measurements, we find this change in activity correlated with changes in Lon oligomerization. Our study provides insights into the complex regulation of the Lon protease driven by electrostatic contributions from either DNA binding or mutations. Competing Interests: Conflict of interests The authors declare that they have no conflicts of interest with the contents of this article. (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.) |
| Databáze: | MEDLINE |
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