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- PDB-6ez8: Human Huntingtin-HAP40 complex structure -

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Basic information

Entry
Database: PDB / ID: 6ez8
TitleHuman Huntingtin-HAP40 complex structure
Components
  • Factor VIII intron 22 protein
  • Huntingtin
KeywordsPROTEIN BINDING / Huntingtin / HAP40/F8A / Cryo-EM / Huntington's disease
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 / Soluble NSF attachment protein, SNAP / Huntingtin / Huntingtin, middle-repeat / Huntingtin family / : / : / : / Huntingtin, N-terminal HEAT / Huntingtin, bridge ...Factor VIII intron 22 protein / Soluble NSF attachment protein, SNAP / 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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å
AuthorsGuo, Q. / Bin, H. / Cheng, J. / Pfeifer, G. / Baumeister, W. / Fernandez-Busnadiego, R. / Kochanek, S.
Funding support Germany, United States, 3items
OrganizationGrant numberCountry
European CommissionFP7 GA ERC-2012-SyG_318987-ToPAG Germany
CHDIA12302 United States
CHDI foundation Germany
CitationJournal: Nature / Year: 2018
Title: The cryo-electron microscopy structure of huntingtin.
Authors: Qiang Guo / Bin Huang / Jingdong Cheng / Manuel Seefelder / Tatjana Engler / Günter Pfeifer / Patrick Oeckl / Markus Otto / Franziska Moser / Melanie Maurer / Alexander Pautsch / Wolfgang ...Authors: Qiang Guo / Bin Huang / Jingdong Cheng / Manuel Seefelder / Tatjana Engler / Günter Pfeifer / Patrick Oeckl / Markus Otto / Franziska Moser / Melanie Maurer / Alexander Pautsch / Wolfgang Baumeister / Rubén Fernández-Busnadiego / Stefan Kochanek /
Abstract: Huntingtin (HTT) is a large (348 kDa) protein that is essential for embryonic development and is involved in diverse cellular activities such as vesicular transport, endocytosis, autophagy and the ...Huntingtin (HTT) is a large (348 kDa) protein that is essential for embryonic development and is involved in diverse cellular activities such as vesicular transport, endocytosis, autophagy and the regulation of transcription. Although an integrative understanding of the biological functions of HTT is lacking, the large number of identified HTT interactors suggests that it serves as a protein-protein interaction hub. Furthermore, Huntington's disease is caused by a mutation in the HTT gene, resulting in a pathogenic expansion of a polyglutamine repeat at the amino terminus of HTT. However, only limited structural information regarding HTT is currently available. Here we use cryo-electron microscopy to determine the structure of full-length human HTT in a complex with HTT-associated protein 40 (HAP40; encoded by three F8A genes in humans) to an overall resolution of 4 Å. HTT is largely α-helical and consists of three major domains. The amino- and carboxy-terminal domains contain multiple HEAT (huntingtin, elongation factor 3, protein phosphatase 2A and lipid kinase TOR) repeats arranged in a solenoid fashion. These domains are connected by a smaller bridge domain containing different types of tandem repeats. HAP40 is also largely α-helical and has a tetratricopeptide repeat-like organization. HAP40 binds in a cleft and contacts the three HTT domains by hydrophobic and electrostatic interactions, thereby stabilizing the conformation of HTT. These data rationalize previous biochemical results and pave the way for improved understanding of the diverse cellular functions of HTT.
History
DepositionNov 14, 2017Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 21, 2018Provider: repository / Type: Initial release
Revision 1.1Mar 7, 2018Group: Database references / Other / Category: cell / citation / citation_author
Item: _cell.length_a / _cell.length_b ..._cell.length_a / _cell.length_b / _cell.length_c / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 2.0Mar 28, 2018Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Database references / Derived calculations / Polymer sequence / Source and taxonomy / Structure summary
Category: atom_site / entity ...atom_site / entity / entity_poly / entity_poly_seq / entity_src_gen / pdbx_poly_seq_scheme / pdbx_unobs_or_zero_occ_atoms / pdbx_unobs_or_zero_occ_residues / struct_conf / struct_conn / struct_ref_seq / struct_ref_seq_dif
Item: _atom_site.label_seq_id / _entity.formula_weight ..._atom_site.label_seq_id / _entity.formula_weight / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _entity_src_gen.pdbx_end_seq_num / _pdbx_unobs_or_zero_occ_atoms.label_seq_id / _struct_conf.beg_label_seq_id / _struct_conf.end_label_seq_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_label_seq_id / _struct_ref_seq.pdbx_auth_seq_align_beg / _struct_ref_seq.seq_align_end
Revision 2.1Dec 11, 2019Group: Other / Category: atom_sites
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3]

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Structure visualization

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Assembly

Deposited unit
A: Huntingtin
B: Factor VIII intron 22 protein


Theoretical massNumber of molelcules
Total (without water)386,6172
Polymers386,6172
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area10700 Å2
ΔGint-56 kcal/mol
Surface area109410 Å2
MethodPISA

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Components

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


Mass: 347475.375 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: HTT, HD, IT15 / Production host: Homo sapiens (human) / References: UniProt: P42858
#2: Protein Factor VIII intron 22 protein / CpG island 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, F8A, F8A2, F8A, F8A3, F8A / Production host: Homo sapiens (human) / 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: Huntingtin-HAP40 complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.352 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293
Buffer solutionpH: 8
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 %

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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 / Calibrated defocus min: 1400 nm / Calibrated defocus max: 3000 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 32 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM softwareName: RELION / Version: 2.1 / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 98310 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00720887
ELECTRON MICROSCOPYf_angle_d1.13628378
ELECTRON MICROSCOPYf_dihedral_angle_d11.32212674
ELECTRON MICROSCOPYf_chiral_restr0.0573395
ELECTRON MICROSCOPYf_plane_restr0.013576

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