6X9O

High resolution cryoEM structure of huntingtin in complex with HAP40


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Huntingtin structure is orchestrated by HAP40 and shows a polyglutamine expansion-specific interaction with exon 1.

Harding, R.J.Deme, J.C.Hevler, J.F.Tamara, S.Lemak, A.Cantle, J.P.Szewczyk, M.M.Begeja, N.Goss, S.Zuo, X.Loppnau, P.Seitova, A.Hutchinson, A.Fan, L.Truant, R.Schapira, M.Carroll, J.B.Heck, A.J.R.Lea, S.M.Arrowsmith, C.H.

(2021) Commun Biol 4: 1374-1374

  • DOI: 10.1038/s42003-021-02895-4
  • Primary Citation of Related Structures:  
    6X9O

  • PubMed 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 hetero-dimer with HAP40 of unknown functional relevance. We demonstrate in vivo and in cell models that HTT and HAP40 cellular abundance are coupled ...

    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.


    Organizational Affiliation

    Princess Margaret Cancer Centre and Department of Medical Biophysics, University of Toronto, Toronto, ON, M5G 1L7, Canada. Cheryl.Arrowsmith@uhnresearch.ca.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HuntingtinA3156Homo sapiensMutation(s): 2 
Gene Names: HTTHDIT15
UniProt & NIH Common Fund Data Resources
Find proteins for P42858 (Homo sapiens)
Explore P42858 
Go to UniProtKB:  P42858
PHAROS:  P42858
GTEx:  ENSG00000197386 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42858
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
40-kDa huntingtin-associated proteinB389Homo sapiensMutation(s): 0 
Gene Names: F8A1F8A2F8A3
UniProt & NIH Common Fund Data Resources
Find proteins for P23610 (Homo sapiens)
Explore P23610 
Go to UniProtKB:  P23610
GTEx:  ENSG00000277150 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23610
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-17
    Type: Initial release
  • Version 1.1: 2022-03-30
    Changes: Database references