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- PDB-7p6u: Lon protease from Thermus Thermophilus -

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Basic information

Entry
Database: PDB / ID: 7p6u
TitleLon protease from Thermus Thermophilus
Components
  • (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)
  • Lon protease
KeywordsCELL CYCLE / bacterial cell division / AAA+ / unfolding / protease
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 / cytoplasm
Similarity search - Function
LON domain-like / Lon protease, bacterial / Archaeosine Trna-guanine Transglycosylase; Chain: A, domain 4 / : / Lon protease, bacterial/eukaryotic-type / Lon protease AAA+ ATPase lid domain / Peptidase S16, active site / ATP-dependent serine proteases, lon family, serine active site. / Lon proteolytic domain profile. / Peptidase S16, Lon proteolytic domain ...LON domain-like / Lon protease, bacterial / Archaeosine Trna-guanine Transglycosylase; Chain: A, domain 4 / : / Lon protease, bacterial/eukaryotic-type / Lon protease AAA+ ATPase lid domain / 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 N-terminal domain profile. / Lon protease, N-terminal domain / Lon protease, N-terminal domain superfamily / ATP-dependent protease La (LON) substrate-binding domain / Found in ATP-dependent protease La (LON) / Helicase, Ruva Protein; domain 3 - #60 / Ribosomal Protein S5; domain 2 - #10 / PUA-like superfamily / Ribosomal Protein S5; domain 2 / Helicase, Ruva Protein; domain 3 / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / Ribosomal protein S5 domain 2-type fold, subgroup / Roll / P-loop containing nucleotide triphosphate hydrolases / Ribosomal protein S5 domain 2-type fold / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Rossmann fold / P-loop containing nucleoside triphosphate hydrolase / 2-Layer Sandwich / Orthogonal Bundle / 3-Layer(aba) Sandwich / Mainly Beta / Mainly Alpha / Alpha Beta
Similarity search - Domain/homology
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER / Lon protease
Similarity search - Component
Biological speciesThermus thermophilus (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsCoscia, F. / Lowe, J.
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)U105184326 United Kingdom
Wellcome Trust202754/Z/16/Z United Kingdom
CitationJournal: FEBS Lett / Year: 2021
Title: Cryo-EM structure of the full-length Lon protease from Thermus thermophilus.
Authors: Francesca Coscia / Jan Löwe /
Abstract: In bacteria, Lon is a large hexameric ATP-dependent protease that targets misfolded and also folded substrates, some of which are involved in cell division and survival of cellular stress. The N- ...In bacteria, Lon is a large hexameric ATP-dependent protease that targets misfolded and also folded substrates, some of which are involved in cell division and survival of cellular stress. The N-terminal domain of Lon facilitates substrate recognition, but how the domains confer such activity has remained unclear. Here, we report the full-length structure of Lon protease from Thermus thermophilus at 3.9 Å resolution in a substrate-engaged state. The six N-terminal domains are arranged in three pairs, stabilized by coiled-coil segments and forming an additional channel for substrate sensing and entry into the AAA+ ring. Sequence conservation analysis and proteolysis assays confirm that this architecture is required for the degradation of both folded and unfolded substrates in bacteria.
History
DepositionJul 18, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Oct 27, 2021Provider: repository / Type: Initial release
Revision 1.0Oct 27, 2021Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Oct 27, 2021Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Nov 17, 2021Group: Data collection / Database references
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Revision 1.2Oct 1, 2025Group: Advisory / Data collection ...Advisory / Data collection / Derived calculations / Structure summary
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Revision 1.1Oct 1, 2025Data content type: EM metadata / Data content type: EM metadata / Group: Experimental summary / Data content type: EM metadata / Category: em_admin / Data content type: EM metadata / Item: _em_admin.last_update

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Assembly

Deposited unit
A: Lon protease
B: Lon protease
C: Lon protease
D: Lon protease
E: Lon protease
F: Lon protease
S: (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)539,80212
Polymers537,2717
Non-polymers2,5315
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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


Mass: 89442.945 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Thermus thermophilus (bacteria) / Gene: lon, lon_1, TthHC11_08200 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9LCX1, endopeptidase La
#2: Protein/peptide (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)


Mass: 613.749 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Substrate trapped in the Lon protease chamber: it was impossible to define the sequence from the side chains density, therefore it was indicated as a poly-UNK chain
Source: (gene. exp.) Thermus thermophilus (bacteria) / Production host: Escherichia coli BL21(DE3) (bacteria)
#3: Chemical
ChemComp-ANP / PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER


Mass: 506.196 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C10H17N6O12P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: AMP-PNP, energy-carrying molecule analogue*YM
Has ligand of interestY
Has protein modificationN

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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 protease from Thermus thermophilus / Type: COMPLEX
Details: Engaged with a peptide substrate, nucleotide AMP-PNP
Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Thermus thermophilus (bacteria)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
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 FIELD
Image recordingElectron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

Software
NameVersionClassificationNB
phenix.real_space_refine1.19.2_4158refinement
PHENIX1.19.2_4158refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 44449 / Symmetry type: POINT
RefinementHighest resolution: 3.9 Å / Cross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 87.01 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.006737651
ELECTRON MICROSCOPYf_angle_d1.373851063
ELECTRON MICROSCOPYf_chiral_restr0.07525803
ELECTRON MICROSCOPYf_plane_restr0.01126620
ELECTRON MICROSCOPYf_dihedral_angle_d9.18845180

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