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- EMDB-71450: Human ClpP initial assembly -

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Basic information

Entry
Database: EMDB / ID: EMD-71450
TitleHuman ClpP initial assembly
Map data
Sample
  • Complex: Human ClpX-bound ClpP
    • Protein or peptide: ATP-dependent Clp protease proteolytic subunit, mitochondrial
KeywordsMitochondrial protein / serine protease / structural protein / HYDROLASE
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 / : / 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 / : / 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsChen WC
Funding support United States, 3 items
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: Nat Commun / Year: 2026
Title: Cryo-EM structures of human ClpXP reveal mechanisms of assembly and proteolytic activation.
Authors: Wenqian Chen / Gabriel C Lander / Jie Yang /
Abstract: The human ClpXP complex (hClpXP) orchestrates mitochondrial protein quality control through targeted degradation of misfolded and unnecessary proteins. While bacterial ClpXP systems are well ...The human ClpXP complex (hClpXP) orchestrates mitochondrial protein quality control through targeted degradation of misfolded and unnecessary proteins. While bacterial ClpXP systems are well characterized, the assembly and regulation of human ClpXP remain poorly understood. In this study, we elucidate the complete assembly pathway of hClpXP through high-resolution cryo-electron microscopy (cryo-EM) structures. Our findings confirm that hClpP exists as a single-ring heptamer in isolation and reveal a previously undocumented initial assembly complex in which hexameric hClpX first engages with heptameric hClpP. We further demonstrate how this interaction drives substantial conformational rearrangements that facilitate the formation of tetradecameric hClpP within the fully assembled complex. Notably, we characterize a unique eukaryotic sequence in hClpX, termed the E-loop, which plays a critical role in stabilizing hexamer assembly and maintaining ATPase activity. Additionally, we show that peptide binding at the hClpP active site triggers further structural changes essential for achieving full proteolytic competence. Together, these structures provide unprecedented mechanistic insights into the stepwise assembly and activation of hClpXP, significantly advancing our understanding of this essential mitochondrial protein degradation machinery.
History
DepositionJun 26, 2025-
Header (metadata) releaseNov 19, 2025-
Map releaseNov 19, 2025-
UpdateMar 11, 2026-
Current statusMar 11, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_71450.png

Downloads & links

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Map

FileDownload / File: emd_71450.map.gz / Format: CCP4 / Size: 11.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.15 Å/pix.
x 144 pix.
= 165.6 Å		1.15 Å/pix.
x 144 pix.
= 165.6 Å		1.15 Å/pix.
x 144 pix.
= 165.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.15 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.327
Minimum - Maximum-0.8399728 - 1.6793545
Average (Standard dev.)0.019025696 (±0.09212732)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions144144144
Spacing144144144
CellA=B=C: 165.59999 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_71450_msk_1.map
Projections & Slices
AxesZYX

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Histogram

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Half map: #2

Fileemd_71450_half_map_1.map
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Half map: #1

Fileemd_71450_half_map_2.map
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Sample components

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Entire : Human ClpX-bound ClpP

EntireName: Human ClpX-bound ClpP
Components
  • Complex: Human ClpX-bound ClpP
    • Protein or peptide: ATP-dependent Clp protease proteolytic subunit, mitochondrial

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Supramolecule #1: Human ClpX-bound ClpP

SupramoleculeName: Human ClpX-bound ClpP / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 300 KDa

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Macromolecule #1: ATP-dependent Clp protease proteolytic subunit, mitochondrial

MacromoleculeName: ATP-dependent Clp protease proteolytic subunit, mitochondrial
type: protein_or_peptide / ID: 1 / Number of copies: 7 / Enantiomer: LEVO / EC number: endopeptidase Clp
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 24.092797 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: LIPIVVEQTG RGERAYDIYS RLLRERIVCV MGPIDDSVAS LVIAQLLFLQ SESNKKPIHM YINSPGGVVT AGLAIYDTMQ YILNPICTW CVGQAASMGS LLLAAGTPGM RHSLPNSRIM IHQPSGGARG QATDIAIQAE EIMKLKKQLY NIYAKHTKQS L QVIESAME ...String:
LIPIVVEQTG RGERAYDIYS RLLRERIVCV MGPIDDSVAS LVIAQLLFLQ SESNKKPIHM YINSPGGVVT AGLAIYDTMQ YILNPICTW CVGQAASMGS LLLAAGTPGM RHSLPNSRIM IHQPSGGARG QATDIAIQAE EIMKLKKQLY NIYAKHTKQS L QVIESAME RDRYMSPMEA QEFGILDKVL VHPPQDGEDE PTLVQKEPVE AAPAAEPVPA ST

UniProtKB: ATP-dependent Clp protease proteolytic subunit, mitochondrial

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration2 mg/mL
BufferpH: 7.5
Component:
ConcentrationNameFormula
25.0 mMHEPES
150.0 mMsodium chlorideNaCl
5.0 %glycerol
2.0 mMmagnesium chlorideMgCl2
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber 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

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Number grids imaged: 1 / Number real images: 3298 / Average exposure time: 6.8 sec. / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated magnification: 54945 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 3.7 mm / Nominal defocus max: 3.3000000000000003 µm / Nominal defocus min: 0.23 µm / Nominal magnification: 45000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1940578
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

9dvy

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.7.0) / Number images used: 26419
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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Atomic model buiding 1

Initial modelPDB ID:

9dvy


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-9pb1:
Human ClpP initial assembly

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