Download MendeleyStructural Insights into the Allosteric Operation of the Lon AAA+ Protease
Lin, C.-C., Su, S.-C., Su, M.-Y., Liang, P.-H., Feng, C.-C., Wu, S.-H., Chang, C.-I.(2016) Structure 24: 667-675
- PubMed: 27041592
- DOI: https://doi.org/10.1016/j.str.2016.03.001
- Primary Citation of Related Structures:
4YPL, 4YPN - PubMed Abstract:
The Lon AAA+ protease (LonA) is an evolutionarily conserved protease that couples the ATPase cycle into motion to drive substrate translocation and degradation. A hallmark feature shared by AAA+ proteases is the stimulation of ATPase activity by substrates. Here we report the structure of LonA bound to three ADPs, revealing the first AAA+ protease assembly where the six protomers are arranged alternately in nucleotide-free and bound states. Nucleotide binding induces large coordinated movements of conserved pore loops from two pairs of three non-adjacent protomers and shuttling of the proteolytic groove between the ATPase site and a previously unknown Arg paddle. Structural and biochemical evidence supports the roles of the substrate-bound proteolytic groove in allosteric stimulation of ATPase activity and the conserved Arg paddle in driving substrate degradation. Altogether, this work provides a molecular framework for understanding how ATP-dependent chemomechanical movements drive allosteric processes for substrate degradation in a major protein-destruction machine.
Organizational Affiliation:
Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan 11529, ROC; Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan 30013, ROC.
