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- EMDB-41854: Structure of Human Mitochondrial Chaperonin V72I Mutant -

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Basic information

Entry
Database: EMDB / ID: EMD-41854
TitleStructure of Human Mitochondrial Chaperonin V72I Mutant
Map datacryo-em map of mHsp60-V72I
Sample
  • Complex: Human Mitochondrial Chaperonin V72I Mutant
    • Protein or peptide: 60 kDa heat shock protein, mitochondrial
Keywordschaperonin / human mitochondrial mHsp60 / hereditary spastic paraplegia SPG13 / cryo-EM / molecular dynamic simulation / CHAPERONE
Function / homology
Function and homology information


coated vesicle / isotype switching to IgG isotypes / lipopolysaccharide receptor complex / TFAP2A acts as a transcriptional repressor during retinoic acid induced cell differentiation / apolipoprotein A-I binding / mitochondrial unfolded protein response / migrasome / high-density lipoprotein particle binding / protein import into mitochondrial intermembrane space / positive regulation of T cell mediated immune response to tumor cell ...coated vesicle / isotype switching to IgG isotypes / lipopolysaccharide receptor complex / TFAP2A acts as a transcriptional repressor during retinoic acid induced cell differentiation / apolipoprotein A-I binding / mitochondrial unfolded protein response / migrasome / high-density lipoprotein particle binding / protein import into mitochondrial intermembrane space / positive regulation of T cell mediated immune response to tumor cell / Mitochondrial protein import / chaperonin ATPase / positive regulation of macrophage activation / cellular response to interleukin-7 / biological process involved in interaction with symbiont / MyD88-dependent toll-like receptor signaling pathway / 'de novo' protein folding / sperm plasma membrane / B cell activation / B cell proliferation / DNA replication origin binding / apoptotic mitochondrial changes / apolipoprotein binding / positive regulation of interleukin-10 production / positive regulation of interferon-alpha production / protein maturation / response to unfolded protein / chaperone-mediated protein complex assembly / clathrin-coated pit / sperm midpiece / Mitochondrial protein degradation / T cell activation / positive regulation of interleukin-12 production / response to cold / isomerase activity / secretory granule / lipopolysaccharide binding / ATP-dependent protein folding chaperone / positive regulation of interleukin-6 production / positive regulation of type II interferon production / activation of cysteine-type endopeptidase activity involved in apoptotic process / double-stranded RNA binding / positive regulation of T cell activation / unfolded protein binding / p53 binding / protein folding / single-stranded DNA binding / protein-folding chaperone binding / protein refolding / mitochondrial inner membrane / early endosome / protein stabilization / mitochondrial matrix / positive regulation of apoptotic process / ubiquitin protein ligase binding / negative regulation of apoptotic process / enzyme binding / cell surface / ATP hydrolysis activity / protein-containing complex / mitochondrion / RNA binding / extracellular space / extracellular exosome / ATP binding / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Chaperonin Cpn60, conserved site / Chaperonins cpn60 signature. / Chaperonin Cpn60/GroEL / GroEL-like equatorial domain superfamily / TCP-1-like chaperonin intermediate domain superfamily / GroEL-like apical domain superfamily / TCP-1/cpn60 chaperonin family / Chaperonin Cpn60/GroEL/TCP-1 family
Similarity search - Domain/homology
60 kDa heat shock protein, mitochondrial
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsChen L / Wang J
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI173104 United States
CitationJournal: Structure / Year: 2024
Title: Cryo-EM structure and molecular dynamic simulations explain the enhanced stability and ATP activity of the pathological chaperonin mutant.
Authors: Aiza Syed / Jihang Zhai / Baolin Guo / Yuan Zhao / Joseph Che-Yen Wang / Lingling Chen /
Abstract: Chaperonins Hsp60s are required for cellular vitality by assisting protein folding in an ATP-dependent mechanism. Although conserved, the human mitochondrial mHsp60 exhibits molecular characteristics ...Chaperonins Hsp60s are required for cellular vitality by assisting protein folding in an ATP-dependent mechanism. Although conserved, the human mitochondrial mHsp60 exhibits molecular characteristics distinct from the E. coli GroEL, with different conformational assembly and higher subunit association dynamics, suggesting a different mechanism. We previously found that the pathological mutant mHsp60 exhibits enhanced subunit association stability and ATPase activity. To provide structural explanations for the V72I mutational effects, here we determined a cryo-EM structure of mHsp60. Our structural analysis combined with molecular dynamic simulations showed mHsp60 with increased inter-subunit interface, binding free energy, and dissociation force, all contributing to its enhanced subunit association stability. The gate to the nucleotide-binding (NB) site in mHsp60 mimicked the open conformation in the nucleotide-bound state with an additional open channel leading to the NB site, both promoting the mutant's ATPase activity. Our studies highlight the importance of mHsp60's characteristics in its biological function.
History
DepositionSep 7, 2023-
Header (metadata) releaseAug 14, 2024-
Map releaseAug 14, 2024-
UpdateAug 14, 2024-
Current statusAug 14, 2024Processing site: RCSB / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_41854.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationcryo-em map of mHsp60-V72I
Voxel sizeX=Y=Z: 1.069 Å
Density
Contour LevelBy AUTHOR: 0.005
Minimum - Maximum-0.05108892 - 0.07656991
Average (Standard dev.)0.0000084147205 (±0.001551699)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-159-159-159
Dimensions320320320
Spacing320320320
CellA=B=C: 342.08002 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Human Mitochondrial Chaperonin V72I Mutant

EntireName: Human Mitochondrial Chaperonin V72I Mutant
Components
  • Complex: Human Mitochondrial Chaperonin V72I Mutant
    • Protein or peptide: 60 kDa heat shock protein, mitochondrial

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Supramolecule #1: Human Mitochondrial Chaperonin V72I Mutant

SupramoleculeName: Human Mitochondrial Chaperonin V72I Mutant / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 60 kDa/nm

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Macromolecule #1: 60 kDa heat shock protein, mitochondrial

MacromoleculeName: 60 kDa heat shock protein, mitochondrial / type: protein_or_peptide / ID: 1 / Number of copies: 7 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 55.875164 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: AKDVKFGADA RALMLQGVDL LADAVAVTMG PKGRTVIIEQ SWGSPKVTKD GVTVAKSIDL KDKYKNIGAK LIQDVANNTN EEAGDGTTT ATVLARSIAK EGFEKISKGA NPVEIRRGVM LAVDAVIAEL KKQSKPVTTP EEIAQVATIS ANGDKEIGNI I SDAMKKVG ...String:
AKDVKFGADA RALMLQGVDL LADAVAVTMG PKGRTVIIEQ SWGSPKVTKD GVTVAKSIDL KDKYKNIGAK LIQDVANNTN EEAGDGTTT ATVLARSIAK EGFEKISKGA NPVEIRRGVM LAVDAVIAEL KKQSKPVTTP EEIAQVATIS ANGDKEIGNI I SDAMKKVG RKGVITVKDG KTLNDELEII EGMKFDRGYI SPYFINTSKG QKCEFQDAYV LLSEKKISSI QSIVPALEIA NA HRKPLVI IAEDVDGEAL STLVLNRLKV GLQVVAVKAP GFGDNRKNQL KDMAIATGGA VFGEEGLTLN LEDVQPHDLG KVG EVIVTK DDAMLLKGKG DKAQIEKRIQ EIIEQLDVTT SEYEKEKLNE RLAKLSDGVA VLKVGGTSDV EVNEKKDRVT DALN ATRAA VEEGIVLGGG CALLRCIPAL DSLTPANEDQ KIGIEIIKRT LKIPAMTIAK NAGVEGSLIV EKIMQSSSEV GYDAM AGDF VNMVEKGIID PTKVVRTALL DAAGVASLLT TAEVVVTEIP

UniProtKB: 60 kDa heat shock protein, 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

Concentration7.5 mg/mL
BufferpH: 7.5
GridModel: Quantifoil R2/2 / Material: COPPER / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.8 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C7 (7 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 532348
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC

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Atomic model buiding 1

Initial modelPDB ID:

7l7s


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

PDB-8u39:
Structure of Human Mitochondrial Chaperonin V72I mutant

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