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- PDB-7dxk: Human 128QHuntingtin-HAP40 complex structure -

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Basic information

Entry
Database: PDB / ID: 7dxk
TitleHuman 128QHuntingtin-HAP40 complex structure
Components
  • 40-kDa huntingtin-associated protein
  • Huntingtin
KeywordsSTRUCTURAL PROTEIN / Huntingtin / 128Q / HAP40
Function / homology
Function and homology information


vesicle cytoskeletal trafficking / regulation of cAMP-dependent protein kinase activity / regulation of phosphoprotein phosphatase activity / positive regulation of inositol 1,4,5-trisphosphate-sensitive calcium-release channel activity / microtubule-based transport / vocal learning / regulation of CAMKK-AMPK signaling cascade / negative regulation of proteasomal protein catabolic process / positive regulation of mitophagy / profilin binding ...vesicle cytoskeletal trafficking / regulation of cAMP-dependent protein kinase activity / regulation of phosphoprotein phosphatase activity / positive regulation of inositol 1,4,5-trisphosphate-sensitive calcium-release channel activity / microtubule-based transport / vocal learning / regulation of CAMKK-AMPK signaling cascade / negative regulation of proteasomal protein catabolic process / positive regulation of mitophagy / profilin binding / vesicle transport along microtubule / positive regulation of cilium assembly / presynaptic cytosol / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / positive regulation of aggrephagy / postsynaptic cytosol / positive regulation of lipophagy / dynein intermediate chain binding / beta-tubulin binding / Golgi organization / dynactin binding / establishment of mitotic spindle orientation / Regulation of MECP2 expression and activity / autophagosome / inclusion body / heat shock protein binding / centriole / negative regulation of extrinsic apoptotic signaling pathway / protein destabilization / cytoplasmic vesicle membrane / kinase binding / p53 binding / late endosome / transmembrane transporter binding / nuclear body / early endosome / positive regulation of apoptotic process / axon / dendrite / apoptotic process / perinuclear region of cytoplasm / Golgi apparatus / endoplasmic reticulum / protein-containing complex / nucleoplasm / identical protein binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Factor VIII intron 22 protein / Huntingtin / Huntingtin, middle-repeat / Huntingtin family / : / : / : / Huntingtin, N-terminal HEAT / Huntingtin, bridge / Huntingtin, N-terminal HEAT 1 ...Factor VIII intron 22 protein / Huntingtin / Huntingtin, middle-repeat / Huntingtin family / : / : / : / Huntingtin, N-terminal HEAT / Huntingtin, bridge / Huntingtin, N-terminal HEAT 1 / Huntingtin, C-terminal HEAT / Armadillo-like helical / Tetratricopeptide-like helical domain superfamily / Armadillo-type fold
Similarity search - Domain/homology
40-kDa huntingtin-associated protein / Huntingtin
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsGuo, Q. / Fernandez-Busnadiego, R.
Funding support Germany, European Union, 4items
OrganizationGrant numberCountry
German Research Foundation (DFG)412854449 Germany
European CommissionERC-2012-SyG 318987-ToPAGEuropean Union
German Research Foundation (DFG)EXC 2067/1- 390729940 Germany
German Research Foundation (DFG)STE 2517/1-1 Germany
CitationJournal: Structure / Year: 2021
Title: Pathological polyQ expansion does not alter the conformation of the Huntingtin-HAP40 complex.
Authors: Bin Huang / Qiang Guo / Marie L Niedermeier / Jingdong Cheng / Tatjana Engler / Melanie Maurer / Alexander Pautsch / Wolfgang Baumeister / Florian Stengel / Stefan Kochanek / Rubén Fernández-Busnadiego /
Abstract: The abnormal amplification of a CAG repeat in the gene coding for huntingtin (HTT) leads to Huntington's disease (HD). At the protein level, this translates into the expansion of a polyglutamine ...The abnormal amplification of a CAG repeat in the gene coding for huntingtin (HTT) leads to Huntington's disease (HD). At the protein level, this translates into the expansion of a polyglutamine (polyQ) stretch located at the HTT N terminus, which renders HTT aggregation prone by unknown mechanisms. Here we investigated the effects of polyQ expansion on HTT in a complex with its stabilizing interaction partner huntingtin-associated protein 40 (HAP40). Surprisingly, our comprehensive biophysical, crosslinking mass spectrometry and cryo-EM experiments revealed no major differences in the conformation of HTT-HAP40 complexes of various polyQ length, including 17QHTT-HAP40 (wild type), 46QHTT-HAP40 (typical polyQ length in HD patients), and 128QHTT-HAP40 (extreme polyQ length). Thus, HTT polyQ expansion does not alter the global conformation of HTT when associated with HAP40.
History
DepositionJan 19, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 24, 2021Provider: repository / Type: Initial release
Revision 1.1Oct 6, 2021Group: Database references / Category: citation / citation_author / database_2
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _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 / _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Huntingtin
B: 40-kDa huntingtin-associated protein


Theoretical massNumber of molelcules
Total (without water)400,8402
Polymers400,8402
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Huntingtin / / Huntington disease protein / HD protein


Mass: 361698.406 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: 128Q-Huntingtin
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) synthetic construct (others)
Gene: HTT, HD, IT15 / Production host: Escherichia coli K-12 (bacteria) / References: UniProt: P42858
#2: Protein 40-kDa huntingtin-associated protein / HAP40 / CpG island protein / Factor VIII intron 22 protein


Mass: 39141.879 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: F8A1, F8A2, F8A3 / Production host: Escherichia coli K-12 (bacteria) / References: UniProt: P23610

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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: Human 128QHuntingtin-HAP40 complex structure / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli K-12 (bacteria)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: Quantifoil
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameCategory
10RELIONinitial Euler assignment
11RELIONfinal Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 122992 / Symmetry type: POINT

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