Oxidized-form structure of E.coli Lon Proteolytic domain

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.156 

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A redox switch shapes the Lon protease exit pore to facultatively regulate proteolysis.

Nishii, W.Kukimoto-Niino, M.Terada, T.Shirouzu, M.Muramatsu, T.Kojima, M.Kihara, H.Yokoyama, S.

(2015) Nat Chem Biol 11: 46-51

  • DOI: https://doi.org/10.1038/nchembio.1688
  • Primary Citation of Related Structures:  
    3WU3, 3WU4, 3WU5, 3WU6

  • PubMed Abstract: 

    The Lon AAA+ protease degrades damaged or misfolded proteins in its intramolecular chamber. Its activity must be precisely controlled, but the mechanism by which Lon is regulated in response to different environments is not known. Facultative anaerobes in the Enterobacteriaceae family, mostly symbionts and pathogens, encounter both anaerobic and aerobic environments inside and outside the host's body, respectively. The bacteria characteristically have two cysteine residues on the Lon protease (P) domain surface that unusually form a disulfide bond. Here we show that the cysteine residues act as a redox switch of Lon. Upon disulfide bond reduction, the exit pore of the P-domain ring narrows by ∼30%, thus interrupting product passage and decreasing activity by 80%; disulfide bonding by oxidation restores the pore size and activity. The redox switch (E°' = -227 mV) is appropriately tuned to respond to variation between anaerobic and aerobic conditions, thus optimizing the cellular proteolysis level for each environment.

  • Organizational Affiliation

    1] RIKEN Systems and Structural Biology Center, Yokohama, Japan. [2] RIKEN Structural Biology Laboratory, Yokohama, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lon protease
A, B, C, D, E
A, B, C, D, E, F
200Escherichia coli DH1Mutation(s): 1 
Gene Names: lonEcDH1_3170ECDH1ME8569_0424
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.156 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.391α = 90
b = 86.391β = 90
c = 124.37γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description