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Basic information

Entry
Database: PDB / ID: 7fiz
TitleProcessive cleavage of substrate at individual proteolytic active sites of the Lon protease complex (conformation 3)
Components
  • Lon proteaseLon protease family
  • Unknown endogenous substrate
KeywordsHYDROLASE / AAA / protease / complex / proteolysis
Function / homology
Function and homology information


endopeptidase La / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / cellular response to heat / sequence-specific DNA binding / serine-type endopeptidase activity / ATP hydrolysis activity / ATP binding / identical protein binding / cytoplasm
Similarity search - Function
Lon protease, bacterial / Lon protease, bacterial/eukaryotic-type / Peptidase S16, active site / ATP-dependent serine proteases, lon family, serine active site. / Lon proteolytic domain profile. / Peptidase S16, Lon proteolytic domain / Lon protease / Lon protease (S16) C-terminal proteolytic domain / Lon protease, N-terminal domain superfamily / Lon N-terminal domain profile. ...Lon protease, bacterial / Lon protease, bacterial/eukaryotic-type / Peptidase S16, active site / ATP-dependent serine proteases, lon family, serine active site. / Lon proteolytic domain profile. / Peptidase S16, Lon proteolytic domain / Lon protease / Lon protease (S16) C-terminal proteolytic domain / Lon protease, N-terminal domain superfamily / Lon N-terminal domain profile. / Lon protease, N-terminal domain / ATP-dependent protease La (LON) substrate-binding domain / Found in ATP-dependent protease La (LON) / PUA-like superfamily / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S5 domain 2-type fold / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / Lon protease
Similarity search - Component
Biological speciesMeiothermus taiwanensis (bacteria)
Meiothermus taiwanensis WR-220 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.28 Å
AuthorsLi, S. / Hsieh, K. / Kuo, C. / Su, S. / Huang, K. / Zhang, K. / Chang, C.I.
Funding support Taiwan, 1items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, Taiwan)108-2320-B-001-011-MY3 Taiwan
CitationJournal: Sci Adv / Year: 2021
Title: Processive cleavage of substrate at individual proteolytic active sites of the Lon protease complex.
Authors: Shanshan Li / Kan-Yen Hsieh / Chiao-I Kuo / Shih-Chieh Su / Kai-Fa Huang / Kaiming Zhang / Chung-I Chang /
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 ...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.
History
DepositionAug 1, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 24, 2021Provider: repository / Type: Initial release

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Structure visualization

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Assembly

Deposited unit
B: Lon protease
C: Lon protease
D: Lon protease
E: Lon protease
F: Lon protease
A: Lon protease
S: Unknown endogenous substrate
hetero molecules


Theoretical massNumber of molelcules
Total (without water)544,89912
Polymers542,3787
Non-polymers2,5205
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area47320 Å2
ΔGint-116 kcal/mol
Surface area203770 Å2

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Components

#1: Protein
Lon protease / Lon protease family / ATP-dependent protease La


Mass: 90081.336 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Meiothermus taiwanensis (bacteria) / Gene: lonA1, lon / Production host: Escherichia coli (E. coli) / References: UniProt: A0A059VAZ3, endopeptidase La
#2: Protein/peptide Unknown endogenous substrate


Mass: 1890.321 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Meiothermus taiwanensis WR-220 (bacteria)
Production host: Escherichia coli (E. coli)
#3: Chemical
ChemComp-AGS / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-GAMMA-S / ADENOSINE 5'-(3-THIOTRIPHOSPHATE) / ADENOSINE 5'-(GAMMA-THIOTRIPHOSPHATE) / ADENOSINE-5'-DIPHOSPHATE MONOTHIOPHOSPHATE


Mass: 523.247 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O12P3S / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP-gamma-S, energy-carrying molecule analogue*YM
#4: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE / Adenosine diphosphate


Mass: 427.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Lon bound to endogenous substrate / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.6 MDa / Experimental value: YES
Source (natural)Organism: Meiothermus taiwanensis WR-220 (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 48 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
EM software
IDNameVersionCategory
2EPUimage acquisition
13cryoSPARC33D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.28 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 77159 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00837672
ELECTRON MICROSCOPYf_angle_d1.0551116
ELECTRON MICROSCOPYf_dihedral_angle_d5.60423243
ELECTRON MICROSCOPYf_chiral_restr0.0585829
ELECTRON MICROSCOPYf_plane_restr0.016647

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