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- PDB-7xc5: Crystal structure of the ANK domain of CLPB -

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Basic information

Entry
Database: PDB / ID: 7xc5
TitleCrystal structure of the ANK domain of CLPB
ComponentsIsoform 2 of Caseinolytic peptidase B protein homolog
KeywordsHYDROLASE / ANK repeat / TRANSPORT PROTEIN
Function / homology
Function and homology information


granulocyte differentiation / RIG-I signaling pathway / ATP-dependent protein disaggregase activity / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / antiviral innate immune response / mitochondrial intermembrane space / cellular response to heat / ATP hydrolysis activity / mitochondrion / ATP binding / cytoplasm
Similarity search - Function
: / ClpA/B family / Clp ATPase, C-terminal / AAA domain (Cdc48 subfamily) / C-terminal, D2-small domain, of ClpB protein / C-terminal, D2-small domain, of ClpB protein / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats ...: / ClpA/B family / Clp ATPase, C-terminal / AAA domain (Cdc48 subfamily) / C-terminal, D2-small domain, of ClpB protein / C-terminal, D2-small domain, of ClpB protein / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / ATPase, AAA-type, core / Ankyrin repeat-containing domain superfamily / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Mitochondrial disaggregase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.1 Å
AuthorsLiu, Y. / Wu, D. / Lu, G. / Gao, N. / Lin, J.
Funding support China, 4items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31725007 China
National Natural Science Foundation of China (NSFC)31922036 China
National Natural Science Foundation of China (NSFC)32130063 China
National Natural Science Foundation of China (NSFC)31770784 China
CitationJournal: PLoS Biol / Year: 2023
Title: Comprehensive structural characterization of the human AAA+ disaggregase CLPB in the apo- and substrate-bound states reveals a unique mode of action driven by oligomerization.
Authors: Damu Wu / Yan Liu / Yuhao Dai / Guopeng Wang / Guoliang Lu / Yan Chen / Ningning Li / Jinzhong Lin / Ning Gao /
Abstract: The human AAA+ ATPase CLPB (SKD3) is a protein disaggregase in the mitochondrial intermembrane space (IMS) and functions to promote the solubilization of various mitochondrial proteins. Loss-of- ...The human AAA+ ATPase CLPB (SKD3) is a protein disaggregase in the mitochondrial intermembrane space (IMS) and functions to promote the solubilization of various mitochondrial proteins. Loss-of-function CLPB mutations are associated with a few human diseases with neutropenia and neurological disorders. Unlike canonical AAA+ proteins, CLPB contains a unique ankyrin repeat domain (ANK) at its N-terminus. How CLPB functions as a disaggregase and the role of its ANK domain are currently unclear. Herein, we report a comprehensive structural characterization of human CLPB in both the apo- and substrate-bound states. CLPB assembles into homo-tetradecamers in apo-state and is remodeled into homo-dodecamers upon substrate binding. Conserved pore-loops (PLs) on the ATPase domains form a spiral staircase to grip and translocate the substrate in a step-size of 2 amino acid residues. The ANK domain is not only responsible for maintaining the higher-order assembly but also essential for the disaggregase activity. Interactome analysis suggests that the ANK domain may directly interact with a variety of mitochondrial substrates. These results reveal unique properties of CLPB as a general disaggregase in mitochondria and highlight its potential as a target for the treatment of various mitochondria-related diseases.
History
DepositionMar 23, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 18, 2023Provider: repository / Type: Initial release
Revision 1.1Aug 2, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _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 / _citation_author.identifier_ORCID
Revision 1.2May 29, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
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Assembly

Deposited unit
A: Isoform 2 of Caseinolytic peptidase B protein homolog


Theoretical massNumber of molelcules
Total (without water)22,1901
Polymers22,1901
Non-polymers00
Water52229
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area0 Å2
ΔGint0 kcal/mol
Surface area8700 Å2
Unit cell
Length a, b, c (Å)87.160, 67.680, 30.310
Angle α, β, γ (deg.)90.000, 104.180, 90.000
Int Tables number5
Space group name H-MC121

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Components

#1: Protein Isoform 2 of Caseinolytic peptidase B protein homolog / Suppressor of potassium transport defect 3


Mass: 22189.711 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CLPB, HSP78, SKD3 / Plasmid: pET22 / Production host: Escherichia coli BL21(DE3) (bacteria)
References: UniProt: Q9H078, Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides
#2: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 29 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 1.95 Å3/Da / Density % sol: 37.02 % / Mosaicity: 0 °
Crystal growTemperature: 289 K / Method: evaporation / pH: 6.8 / Details: PEG 3350

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: SSRF / Beamline: BL18U1 / Wavelength: 0.97915 Å
DetectorType: DECTRIS PILATUS3 6M / Detector: PIXEL / Date: Mar 5, 2022
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.97915 Å / Relative weight: 1
ReflectionResolution: 1.99→33.84 Å / Num. obs: 11694 / % possible obs: 99.4 % / Redundancy: 3.3 % / Biso Wilson estimate: 34.7 Å2 / CC1/2: 0.998 / Rmerge(I) obs: 0.058 / Rpim(I) all: 0.038 / Rrim(I) all: 0.07 / Net I/σ(I): 11.2 / Num. measured all: 38740 / Scaling rejects: 2
Reflection shell

Diffraction-ID: 1

Resolution (Å)Redundancy (%)Rmerge(I) obsNum. measured allNum. unique obsCC1/2Rpim(I) allRrim(I) allNet I/σ(I) obs% possible all
1.99-2.043.40.62329038600.8650.3950.7391.999.5
8.9-33.8430.0254251410.9990.0170.0330.696.2

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Processing

Software
NameVersionClassification
Aimless0.7.7data scaling
PHENIX1.19_4092refinement
PDB_EXTRACT3.27data extraction
XDSdata reduction
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.1→33.84 Å / SU ML: 0.27 / Cross valid method: THROUGHOUT / σ(F): 1.36 / Phase error: 33.36 / Stereochemistry target values: ML
RfactorNum. reflection% reflection
Rfree0.2362 447 4.49 %
Rwork0.206 9519 -
obs0.2074 9966 99.16 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso max: 119.9 Å2 / Biso mean: 48.9111 Å2 / Biso min: 23.11 Å2
Refinement stepCycle: final / Resolution: 2.1→33.84 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1287 0 0 29 1316
Biso mean---43.93 -
Num. residues----166
LS refinement shell

Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0 / Total num. of bins used: 3 / % reflection obs: 99 %

Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkNum. reflection all
2.1-2.40.31611610.257731513312
2.4-3.030.24631380.235831783316
3.03-33.840.21461480.183431903338

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