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- PDB-6x9o: High resolution cryoEM structure of huntingtin in complex with HAP40 -
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Open data
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Basic information
Entry | Database: PDB / ID: 6x9o | ||||||
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Title | High resolution cryoEM structure of huntingtin in complex with HAP40 | ||||||
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![]() | PROTEIN BINDING / Huntingtin / HTT / 40-kDa huntingtin-associated protein / HAP40 / Structural Genomics / Structural Genomics Consortium / SGC | ||||||
Function / homology | ![]() 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 / establishment of mitotic spindle orientation / dynactin binding / 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 / early endosome / nuclear body / positive regulation of apoptotic process / axon / apoptotic process / dendrite / perinuclear region of cytoplasm / Golgi apparatus / endoplasmic reticulum / protein-containing complex / nucleoplasm / identical protein binding / nucleus / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.6 Å | ||||||
![]() | Harding, R.J. / Deme, J.C. / Lea, S.M. / Arrowsmith, C.H. / Structural Genomics Consortium (SGC) | ||||||
![]() | ![]() Title: Huntingtin structure is orchestrated by HAP40 and shows a polyglutamine expansion-specific interaction with exon 1. Authors: Rachel J Harding / Justin C Deme / Johannes F Hevler / Sem Tamara / Alexander Lemak / Jeffrey P Cantle / Magdalena M Szewczyk / Nola Begeja / Siobhan Goss / Xiaobing Zuo / Peter Loppnau / ...Authors: Rachel J Harding / Justin C Deme / Johannes F Hevler / Sem Tamara / Alexander Lemak / Jeffrey P Cantle / Magdalena M Szewczyk / Nola Begeja / Siobhan Goss / Xiaobing Zuo / Peter Loppnau / Alma Seitova / Ashley Hutchinson / Lixin Fan / Ray Truant / Matthieu Schapira / Jeffrey B Carroll / Albert J R Heck / Susan M Lea / Cheryl H Arrowsmith / ![]() ![]() ![]() ![]() Abstract: Huntington's disease results from expansion of a glutamine-coding CAG tract in the huntingtin (HTT) gene, producing an aberrantly functioning form of HTT. Both wildtype and disease-state HTT form a ...Huntington's disease results from expansion of a glutamine-coding CAG tract in the huntingtin (HTT) gene, producing an aberrantly functioning form of HTT. Both wildtype and disease-state HTT form a hetero-dimer with HAP40 of unknown functional relevance. We demonstrate in vivo and in cell models that HTT and HAP40 cellular abundance are coupled. Integrating data from a 2.6 Å cryo-electron microscopy structure, cross-linking mass spectrometry, small-angle X-ray scattering, and modeling, we provide a near-atomic-level view of HTT, its molecular interaction surfaces and compacted domain architecture, orchestrated by HAP40. Native mass spectrometry reveals a remarkably stable hetero-dimer, potentially explaining the cellular inter-dependence of HTT and HAP40. The exon 1 region of HTT is dynamic but shows greater conformational variety in the polyglutamine expanded mutant than wildtype exon 1. Our data provide a foundation for future functional and drug discovery studies targeting Huntington's disease and illuminate the structural consequences of HTT polyglutamine expansion. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 473.8 KB | Display | ![]() |
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PDB format | ![]() | 383.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 90.3 KB | Display | |
Data in CIF | ![]() | 134.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22106MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 349472.344 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#2: Protein | Mass: 41342.254 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Human huntingtin-HAP40 complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT | |||||||||||||||||||||||||
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Source (natural) | Organism: ![]() | |||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 7.4 | |||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 0.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||||||||||||
Specimen support | Details: 15 mA / Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/4 | |||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 8 sec. / Electron dose: 48 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 QUANTUM (4k x 4k) |
EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
Image scans | Movie frames/image: 32 |
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Processing
Software | Name: PHENIX / Version: 1.17.1_3660: / Classification: refinement | ||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 647468 / Symmetry type: POINT | ||||||||||||||||||||||||||||
Refine LS restraints |
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