+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-23019 | |||||||||||||||
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Title | Substrate-free human mitochondrial LONP1 | |||||||||||||||
Map data | Substrate-free human mitochondrial LONP1 | |||||||||||||||
Sample |
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Keywords | AAA+ / ATPase / protease / mitochondrial / LONP1 / LON / HYDROLASE | |||||||||||||||
Function / homology | Function and homology information oxidation-dependent protein catabolic process / PH domain binding / mitochondrial protein catabolic process / G-quadruplex DNA binding / endopeptidase La / mitochondrial DNA metabolic process / mitochondrial genome maintenance / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / mitochondrial nucleoid ...oxidation-dependent protein catabolic process / PH domain binding / mitochondrial protein catabolic process / G-quadruplex DNA binding / endopeptidase La / mitochondrial DNA metabolic process / mitochondrial genome maintenance / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / mitochondrial nucleoid / insulin receptor substrate binding / chaperone-mediated protein complex assembly / DNA polymerase binding / regulation of peptidyl-tyrosine phosphorylation / negative regulation of insulin receptor signaling pathway / Mitochondrial protein degradation / proteolysis involved in protein catabolic process / mitochondrion organization / ADP binding / protein catabolic process / single-stranded DNA binding / cellular response to oxidative stress / sequence-specific DNA binding / single-stranded RNA binding / response to hypoxia / mitochondrial matrix / serine-type endopeptidase activity / ATP hydrolysis activity / mitochondrion / nucleoplasm / ATP binding / identical protein binding / membrane / cytosol Similarity search - Function | |||||||||||||||
Biological species | Homo sapiens (human) | |||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.5 Å | |||||||||||||||
Authors | Shin M / Watson ER | |||||||||||||||
Funding support | United States, 4 items
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Citation | Journal: Nat Commun / Year: 2021 Title: Structures of the human LONP1 protease reveal regulatory steps involved in protease activation. Authors: Mia Shin / Edmond R Watson / Albert S Song / Jeffrey T Mindrebo / Scott J Novick / Patrick R Griffin / R Luke Wiseman / Gabriel C Lander / Abstract: The human mitochondrial AAA+ protein LONP1 is a critical quality control protease involved in regulating diverse aspects of mitochondrial biology including proteostasis, electron transport chain ...The human mitochondrial AAA+ protein LONP1 is a critical quality control protease involved in regulating diverse aspects of mitochondrial biology including proteostasis, electron transport chain activity, and mitochondrial transcription. As such, genetic or aging-associated imbalances in LONP1 activity are implicated in pathologic mitochondrial dysfunction associated with numerous human diseases. Despite this importance, the molecular basis for LONP1-dependent proteolytic activity remains poorly defined. Here, we solved cryo-electron microscopy structures of human LONP1 to reveal the underlying molecular mechanisms governing substrate proteolysis. We show that, like bacterial Lon, human LONP1 adopts both an open and closed spiral staircase orientation dictated by the presence of substrate and nucleotide. Unlike bacterial Lon, human LONP1 contains a second spiral staircase within its ATPase domain that engages substrate as it is translocated toward the proteolytic chamber. Intriguingly, and in contrast to its bacterial ortholog, substrate binding within the central ATPase channel of LONP1 alone is insufficient to induce the activated conformation of the protease domains. To successfully induce the active protease conformation in substrate-bound LONP1, substrate binding within the protease active site is necessary, which we demonstrate by adding bortezomib, a peptidomimetic active site inhibitor of LONP1. These results suggest LONP1 can decouple ATPase and protease activities depending on whether AAA+ or both AAA+ and protease domains bind substrate. Importantly, our structures provide a molecular framework to define the critical importance of LONP1 in regulating mitochondrial proteostasis in health and disease. | |||||||||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_23019.map.gz | 14.5 MB | EMDB map data format | |
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Header (meta data) | emd-23019-v30.xml emd-23019.xml | 23.6 KB 23.6 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_23019_fsc.xml | 7.4 KB | Display | FSC data file |
Images | emd_23019.png | 95.1 KB | ||
Masks | emd_23019_msk_1.map | 15.6 MB | Mask map | |
Filedesc metadata | emd-23019.cif.gz | 7.2 KB | ||
Others | emd_23019_half_map_1.map.gz emd_23019_half_map_2.map.gz | 14.5 MB 14.5 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-23019 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-23019 | HTTPS FTP |
-Validation report
Summary document | emd_23019_validation.pdf.gz | 1.1 MB | Display | EMDB validaton report |
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Full document | emd_23019_full_validation.pdf.gz | 1.1 MB | Display | |
Data in XML | emd_23019_validation.xml.gz | 11.6 KB | Display | |
Data in CIF | emd_23019_validation.cif.gz | 15.9 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-23019 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-23019 | HTTPS FTP |
-Related structure data
Related structure data | 7kslMC 7krzC 7ksmC C: citing same article (ref.) M: atomic model generated by this map |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_23019.map.gz / Format: CCP4 / Size: 15.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Substrate-free human mitochondrial LONP1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.15 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
File | emd_23019_msk_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: Half-map of substrate-free human mitochondrial LONP1
File | emd_23019_half_map_1.map | ||||||||||||
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Annotation | Half-map of substrate-free human mitochondrial LONP1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half-map of substrate-free human mitochondrial LONP1
File | emd_23019_half_map_2.map | ||||||||||||
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Annotation | Half-map of substrate-free human mitochondrial LONP1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Substrate-free human mitochondrial LONP1
Entire | Name: Substrate-free human mitochondrial LONP1 |
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Components |
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-Supramolecule #1: Substrate-free human mitochondrial LONP1
Supramolecule | Name: Substrate-free human mitochondrial LONP1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 Details: Complexes consisting of homohexameric LONP1 protease from Homo sapiens |
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Source (natural) | Organism: Homo sapiens (human) / Organelle: Mitochondria / Location in cell: Matrix |
Molecular weight | Theoretical: 462 KDa |
-Macromolecule #1: Lon protease homolog, mitochondrial
Macromolecule | Name: Lon protease homolog, mitochondrial / type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO / EC number: endopeptidase La |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 58.498098 KDa |
Recombinant expression | Organism: Escherichia coli BL21(DE3) (bacteria) |
Sequence | String: FRERLKELVV PKHVMDVVDE ELSKLGLLDN HSSEFNVTRN YLDWLTSIPW GKYSNENLDL ARAQAVLEED HYGMEDVKKR ILEFIAVSQ LRGSTQGKIL CFYGPPGVGK TSIARSIARA LNREYFRFSV GGMTDVAEIK GHRRTYVGAM PGKIIQCLKK T KTENPLIL ...String: FRERLKELVV PKHVMDVVDE ELSKLGLLDN HSSEFNVTRN YLDWLTSIPW GKYSNENLDL ARAQAVLEED HYGMEDVKKR ILEFIAVSQ LRGSTQGKIL CFYGPPGVGK TSIARSIARA LNREYFRFSV GGMTDVAEIK GHRRTYVGAM PGKIIQCLKK T KTENPLIL IDEVDKIGRG YQGDPSSALL ELLDPEQNAN FLDHYLDVPV DLSKVLFICT ANVTDTIPEP LRDRMEMINV SG YVAQEKL AIAERYLVPQ ARALCGLDES KAKLSSDVLT LLIKQYCRES GVRNLQKQVE KVLRKSAYKI VSGEAESVEV TPE NLQDFV GKPVFTVERM YDVTPPGVVM GLAWTAMGGS TLFVETSLRR PQDKDAKGDK DGSLEVTGQL GEVMKESARI AYTF ARAFL MQHAPANDYL VTSHIHLHVP EGATPKDGPS AGCTIVTALL SLAMGRPVRQ NLAMTGEVSL TGKILPVGGI KEKTI AAKR AGVTCIVLPA ENKKDFYDLA AFITEGLEVH FVEHYREIFD IAF UniProtKB: Lon protease homolog, mitochondrial |
-Macromolecule #2: ADENOSINE-5'-DIPHOSPHATE
Macromolecule | Name: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 2 / Number of copies: 5 / Formula: ADP |
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Molecular weight | Theoretical: 427.201 Da |
Chemical component information | ChemComp-ADP: |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 2.5 mg/mL | |||||||||||||||||||||
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Buffer | pH: 8 Component:
Details: Solutions were made fresh from concentrated and filtered using a 0.1 um syringe filter to avoid microbial contamination. Samples were mixed on ice and incubated for 5 minutes prior to vitrification. | |||||||||||||||||||||
Grid | Model: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 7 sec. / Pretreatment - Atmosphere: OTHER Details: EM grids were plasma cleaned prior to sample application for 7 seconds using a Solarus plasma cleaner (Gatan, Inc.) with a 75% nitrogen, 25% oxygen atmosphere at 15W. | |||||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: HOMEMADE PLUNGER Details: 4 uL of sample was applied per grid and manually blotted for 4 seconds followed by immediately plunge-freezing in liquid ethane cooled by liquid nitrogen.. | |||||||||||||||||||||
Details | This sample was monodisperse |
-Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Temperature | Min: 80.0 K / Max: 90.0 K |
Alignment procedure | Coma free - Residual tilt: 0.14 mrad |
Details | Coma-free alignment procedure from Herzik & Wu, Nature Methods (2017). Preliminary grid screening was performed manually prior to data collection. |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3710 pixel / Digitization - Dimensions - Height: 3838 pixel / Digitization - Frames/image: 0-113 / Number grids imaged: 1 / Number real images: 2912 / Average exposure time: 11.4 sec. / Average electron dose: 50.0 e/Å2 Details: Images were collected in counting mode at 10 frames per second. |
Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
Electron optics | C2 aperture diameter: 70.0 µm / Calibrated defocus max: 1.5 µm / Calibrated defocus min: 0.5 µm / Calibrated magnification: 43478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 36000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | Model: Talos Arctica / Image courtesy: FEI Company |
+Image processing
-Atomic model buiding 1
Details | Initial rigid body docking was done using UCSF Chimera. |
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Refinement | Space: REAL / Protocol: AB INITIO MODEL / Overall B value: 30 / Target criteria: Correlation coefficient |
Output model | PDB-7ksl: |