Download MendeleyCrystal structure of Lon protease: molecular architecture of gated entry to a sequestered degradation chamber
Cha, S.S., An, Y.J., Lee, C.R., Lee, H.S., Kim, Y.G., Kim, S.J., Kwon, K.K., De Donatis, G.M., Lee, J.H., Maurizi, M.R., Kang, S.G.(2010) EMBO J 29: 3520-3530
- PubMed: 20834233
- DOI: https://doi.org/10.1038/emboj.2010.226
- Primary Citation of Related Structures:
3K1J - PubMed Abstract:
Lon proteases are distributed in all kingdoms of life and are required for survival of cells under stress. Lon is a tandem fusion of an AAA+ molecular chaperone and a protease with a serine-lysine catalytic dyad. We report the 2.0-Å resolution crystal structure of Thermococcus onnurineus NA1 Lon (TonLon). The structure is a three-tiered hexagonal cylinder with a large sequestered chamber accessible through an axial channel. Conserved loops extending from the AAA+ domain combine with an insertion domain containing the membrane anchor to form an apical domain that serves as a gate governing substrate access to an internal unfolding and degradation chamber. Alternating AAA+ domains are in tight- and weak-binding nucleotide states with different domain orientations and intersubunit contacts, reflecting intramolecular dynamics during ATP-driven protein unfolding and translocation. The bowl-shaped proteolytic chamber is contiguous with the chaperone chamber allowing internalized proteins direct access to the proteolytic sites without further gating restrictions.
Organizational Affiliation:
Marine Biotechnology Research Center, Korea Ocean Research and Development Institute, Ansan, Republic of Korea. chajung@kordi.re.kr
