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- PDB-9ykz: Un-crosslinked hClpP -

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Basic information

Entry
Database: PDB / ID: 9ykz
TitleUn-crosslinked hClpP
ComponentsATP-dependent Clp protease proteolytic subunit, mitochondrial
KeywordsHYDROLASE / Mitochondrial protein / serine protease / structural protein
Function / homology
Function and homology information


membrane protein proteolysis / mitochondrial protein catabolic process / endopeptidase Clp / endopeptidase Clp complex / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / Mitochondrial protein degradation / proteolysis involved in protein catabolic process / peptidase activity / ATPase binding ...membrane protein proteolysis / mitochondrial protein catabolic process / endopeptidase Clp / endopeptidase Clp complex / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / Mitochondrial protein degradation / proteolysis involved in protein catabolic process / peptidase activity / ATPase binding / endopeptidase activity / mitochondrial matrix / serine-type endopeptidase activity / mitochondrion / proteolysis / identical protein binding
Similarity search - Function
ClpP, Ser active site / Endopeptidase Clp serine active site. / ClpP, histidine active site / Endopeptidase Clp histidine active site. / ATP-dependent Clp protease proteolytic subunit / Clp protease proteolytic subunit /Translocation-enhancing protein TepA / Clp protease / ClpP/crotonase-like domain superfamily
Similarity search - Domain/homology
ATP-dependent Clp protease proteolytic subunit, mitochondrial
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsChen, W.C.
Funding support United States, 3items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States) United States
National Institutes of Health/Office of the DirectorS10 OD032467 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS095892 United States
CitationJournal: To Be Published
Title: Assembly and proteolytic activation human ClpXP defined by cryo-EM
Authors: Chen, W.C.
History
DepositionOct 8, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 19, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
H: ATP-dependent Clp protease proteolytic subunit, mitochondrial
I: ATP-dependent Clp protease proteolytic subunit, mitochondrial
J: ATP-dependent Clp protease proteolytic subunit, mitochondrial
K: ATP-dependent Clp protease proteolytic subunit, mitochondrial
L: ATP-dependent Clp protease proteolytic subunit, mitochondrial
M: ATP-dependent Clp protease proteolytic subunit, mitochondrial
N: ATP-dependent Clp protease proteolytic subunit, mitochondrial


Theoretical massNumber of molelcules
Total (without water)211,4917
Polymers211,4917
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
ATP-dependent Clp protease proteolytic subunit, mitochondrial / Caseinolytic mitochondrial matrix peptidase proteolytic subunit / Endopeptidase Clp


Mass: 30213.020 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CLPP / Production host: Escherichia coli (E. coli) / References: UniProt: Q16740, endopeptidase Clp
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: Un-crosslinked hClpP / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
125 mMHEPES1
2150 mMsodium chlorideNaCl1
32 mMmagnesium chlorideMgCl21
45 %glycerol1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE / Humidity: 90 %
Details: The sample was prepared using manual blot-and-plunge freezing method in cold room (4 degrees Celsius)

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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 FIELD / Nominal magnification: 4500 X / Calibrated magnification: 54945 X / Nominal defocus max: 3300 nm / Nominal defocus min: 230 nm / Cs: 3.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 6.8 sec. / Electron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3298
Image scansSampling size: 5 µm / Width: 3838 / Height: 3710 / Movie frames/image: 50

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.7.0particle selection
4cryoSPARC4.7.0CTF correction
9PHENIX1.21_5207model refinement
10cryoSPARC4.7.0initial Euler assignment
11cryoSPARC4.7.0final Euler assignment
13cryoSPARC4.7.03D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 46168 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Atomic model buildingPDB-ID: 9DW0

9dw0


Accession code: 9DW0 / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 69.59 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00229485
ELECTRON MICROSCOPYf_angle_d0.532212830
ELECTRON MICROSCOPYf_chiral_restr0.04491505
ELECTRON MICROSCOPYf_plane_restr0.00691609
ELECTRON MICROSCOPYf_dihedral_angle_d12.73383580

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