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- PDB-7sxo: Yeast Lon (PIM1) with endogenous substrate -

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Basic information

Entry
Database: PDB / ID: 7sxo
TitleYeast Lon (PIM1) with endogenous substrate
Components
  • Lon protease homolog, mitochondrial
  • endogenous substrate
KeywordsHYDROLASE / Protease / AAA+ ATPase
Function / homology
Function and homology information


regulation of mitochondrial DNA metabolic process / oxidation-dependent protein catabolic process / mitochondrial respiratory chain complex assembly / endopeptidase La / mitochondrial DNA metabolic process / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / chaperone-mediated protein complex assembly / mitochondrion organization / protein folding ...regulation of mitochondrial DNA metabolic process / oxidation-dependent protein catabolic process / mitochondrial respiratory chain complex assembly / endopeptidase La / mitochondrial DNA metabolic process / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / chaperone-mediated protein complex assembly / mitochondrion organization / protein folding / single-stranded DNA binding / cellular response to oxidative stress / response to heat / sequence-specific DNA binding / mitochondrial matrix / serine-type endopeptidase activity / ATP hydrolysis activity / mitochondrion / ATP binding
Similarity search - Function
Lon protease homologue, chloroplastic/mitochondrial / 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 N-terminal domain profile. / Lon protease, N-terminal domain ...Lon protease homologue, chloroplastic/mitochondrial / 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 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 / ADENOSINE-5'-TRIPHOSPHATE / Lon protease homolog, mitochondrial
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Escherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsYang, J. / Song, A.S. / Wiseman, R.L. / Lander, G.C.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) United States
CitationJournal: J Biol Chem / Year: 2022
Title: Cryo-EM structure of hexameric yeast Lon protease (PIM1) highlights the importance of conserved structural elements.
Authors: Jie Yang / Albert S Song / R Luke Wiseman / Gabriel C Lander /
Abstract: Lon protease is a conserved ATP-dependent serine protease composed of an AAA+ domain that mechanically unfolds substrates and a serine protease domain that degrades these unfolded substrates. In ...Lon protease is a conserved ATP-dependent serine protease composed of an AAA+ domain that mechanically unfolds substrates and a serine protease domain that degrades these unfolded substrates. In yeast, dysregulation of Lon protease (PIM1) attenuates lifespan and leads to gross mitochondrial morphological perturbations. Although structures of the bacterial and human Lon protease reveal a hexameric assembly, yeast PIM1 was speculated to form a heptameric assembly and is uniquely characterized by a ∼50-residue insertion between the ATPase and protease domains. To further understand the yeast-specific properties of PIM1, we determined a high-resolution cryo-electron microscopy structure of PIM1 in a substrate-translocating state. Here, we reveal that PIM1 forms a hexamer, conserved with that of bacterial and human Lon proteases, wherein the ATPase domains form a canonical closed spiral that enables pore loop residues to translocate substrates to the protease chamber. In the substrate-translocating state, PIM1 protease domains form a planar protease chamber in an active conformation and are uniquely characterized by a ∼15-residue C-terminal extension. These additional C-terminal residues form an α-helix located along the base of the protease domain. Finally, we did not observe density for the yeast-specific insertion between the ATPase and protease domains, likely due to high conformational flexibility. Biochemical studies to investigate the insertion using constructs that truncated or replaced the insertion with a glycine-serine linker suggest that the yeast-specific insertion is dispensable for PIM1's enzymatic function. Altogether, our structural and biochemical studies highlight unique components of PIM1 machinery and demonstrate evolutionary conservation of Lon protease function.
History
DepositionNov 24, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 12, 2022Provider: repository / Type: Initial release
Revision 1.1Jul 27, 2022Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Assembly

Deposited unit
A: Lon protease homolog, mitochondrial
B: Lon protease homolog, mitochondrial
C: Lon protease homolog, mitochondrial
D: Lon protease homolog, mitochondrial
E: Lon protease homolog, mitochondrial
F: Lon protease homolog, mitochondrial
G: endogenous substrate
hetero molecules


Theoretical massNumber of molelcules
Total (without water)657,05717
Polymers654,0777
Non-polymers2,98010
Water0
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 homolog, mitochondrial


Mass: 108839.602 Da / Num. of mol.: 6 / Fragment: UNP residues 182-1133
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / Gene: PIM1, LON, YBL022C, YBL0440 / Production host: Escherichia coli (E. coli) / References: UniProt: P36775, endopeptidase La
#2: Protein/peptide endogenous substrate


Mass: 1039.273 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli)
#3: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE / Adenosine triphosphate


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#4: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE / Adenosine diphosphate


Mass: 427.201 Da / Num. of mol.: 2 / 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: Cryo-EM structure of yeast Lon (PIM1) in complex with endogenous substrate
Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenConc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 81945 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00225377
ELECTRON MICROSCOPYf_angle_d0.55134331
ELECTRON MICROSCOPYf_dihedral_angle_d4.8863414
ELECTRON MICROSCOPYf_chiral_restr0.0423891
ELECTRON MICROSCOPYf_plane_restr0.0054343

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