Download MendeleyStructural basis for DNA-mediated allosteric regulation facilitated by the AAA(+) module of Lon protease.
Lee, A.Y., Chen, Y.D., Chang, Y.Y., Lin, Y.C., Chang, C.F., Huang, S.J., Wu, S.H., Hsu, C.H.(2014) Acta Crystallogr D Biol Crystallogr 70: 218-230
- PubMed: 24531457
- DOI: https://doi.org/10.1107/S139900471302631X
- Primary Citation of Related Structures:
4GIT - PubMed Abstract:
Lon belongs to a unique group of AAA+ proteases that bind DNA. However, the DNA-mediated regulation of Lon remains elusive. Here, the crystal structure of the α subdomain of the Lon protease from Brevibacillus thermoruber (Bt-Lon) is presented, together with biochemical data, and the DNA-binding mode is delineated, showing that Arg518, Arg557 and Arg566 play a crucial role in DNA binding. Electrostatic interactions contributed by arginine residues in the AAA+ module are suggested to be important to DNA binding and allosteric regulation of enzymatic activities. Intriguingly, Arg557, which directly binds DNA in the α subdomain, has a dual role in the negative regulation of ATPase stimulation by DNA and in the domain-domain communication in allosteric regulation of Bt-Lon by substrate. In conclusion, structural and biochemical evidence is provided to show that electrostatic interaction in the AAA+ module is important for DNA binding by Lon and allosteric regulation of its enzymatic activities by DNA and substrate.
Organizational Affiliation:
National Institute of Cancer Research, National Health Research Institutes, Zhunan, Miaoli 35053, Taiwan.
