4git
From Proteopedia
Crystal structure of alpha sub-domain of Lon protease from Brevibacillus thermoruber
Structural highlights
FunctionQ84FG5_9BACL ATP-dependent serine protease that mediates the selective degradation of mutant and abnormal proteins as well as certain short-lived regulatory proteins. Required for cellular homeostasis and for survival from DNA damage and developmental changes induced by stress. Degrades polypeptides processively to yield small peptide fragments that are 5 to 10 amino acids long. Binds to DNA in a double-stranded, site-specific manner (By similarity).[HAMAP-Rule:MF_01973] Publication Abstract from PubMedLon 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 alpha 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 alpha 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. Structural basis for DNA-mediated allosteric regulation facilitated by the AAA+ module of Lon protease.,Lee AY, Chen YD, Chang YY, Lin YC, Chang CF, Huang SJ, Wu SH, Hsu CH Acta Crystallogr D Biol Crystallogr. 2014 Feb;70(Pt 2):218-30. doi:, 10.1107/S139900471302631X. Epub 2014 Jan 17. PMID:24531457[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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