期刊
FEBS LETTERS
卷 595, 期 21, 页码 2691-2700出版社
WILEY
DOI: 10.1002/1873-3468.14199
关键词
AAA plus; cell cycle; coiled-coil; Lon; protease; unfolding
资金
- Medical Research Council [U105184326]
- Wellcome Trust [202754/Z/16/Z]
- Wellcome Trust [202754/Z/16/Z] Funding Source: Wellcome Trust
Lon protease in bacteria is an ATP-dependent protease targeting misfolded and folded substrates, with the N-terminal domains facilitating substrate recognition and degradation. The full-length structure of Lon protease from Thermus thermophilus reveals a unique architecture essential for substrate sensing and entry into the AAA+ ring, confirming its role in degrading substrates in bacteria.
In bacteria, Lon is a large hexameric ATP-dependent protease that targets misfolded and also folded substrates, some of which are involved in cell division and survival of cellular stress. The N-terminal domain of Lon facilitates substrate recognition, but how the domains confer such activity has remained unclear. Here, we report the full-length structure of Lon protease from Thermus thermophilus at 3.9 angstrom resolution in a substrate-engaged state. The six N-terminal domains are arranged in three pairs, stabilized by coiled-coil segments and forming an additional channel for substrate sensing and entry into the AAA+ ring. Sequence conservation analysis and proteolysis assays confirm that this architecture is required for the degradation of both folded and unfolded substrates in bacteria.
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