7FID

Processive cleavage of substrate at individual proteolytic active sites of the Lon proteasecomplex (conformation 1)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.44 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Processive cleavage of substrate at individual proteolytic active sites of the Lon protease complex.

Li, S.Hsieh, K.Y.Kuo, C.I.Su, S.C.Huang, K.F.Zhang, K.Chang, C.I.

(2021) Sci Adv 7: eabj9537-eabj9537

  • DOI: https://doi.org/10.1126/sciadv.abj9537
  • Primary Citation of Related Structures:  
    7EUX, 7EUY, 7EV4, 7EV6, 7FID, 7FIE, 7FIZ

  • PubMed Abstract: 

    The Lon protease is the prototype of a family of proteolytic machines with adenosine triphosphatase modules built into a substrate degradation chamber. Lon is known to degrade protein substrates in a processive fashion, cutting a protein chain processively into small peptides before commencing cleavages of another protein chain. Here, we present structural and biochemical evidence demonstrating that processive substrate degradation occurs at each of the six proteolytic active sites of Lon, which forms a deep groove that partially encloses the substrate polypeptide chain by accommodating only the unprimed residues and permits processive cleavage in the C-to-N direction. We identify a universally conserved acidic residue at the exit side of the binding groove indispensable for the proteolytic activity. This noncatalytic residue likely promotes processive proteolysis by carboxyl-carboxylate interactions with cleaved intermediates. Together, these results uncover a previously unrecognized mechanism for processive substrate degradation by the Lon protease.


  • Organizational Affiliation

    MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale and Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230027, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lon protease806Meiothermus taiwanensisMutation(s): 0 
Gene Names: lonA1lon
EC: 3.4.21.53
UniProt
Find proteins for A0A059VAZ3 (Meiothermus taiwanensis)
Explore A0A059VAZ3 
Go to UniProtKB:  A0A059VAZ3
Entity Groups  
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UniProt GroupA0A059VAZ3
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
unknown endogenous substrateG [auth S]22Meiothermus taiwanensisMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.44 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC3.0

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, Taiwan)Taiwan108-2320-B-001-011-MY3

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-24
    Type: Initial release