7T8B

Octameric Human Twinkle Helicase Clinical Variant W315L


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural insight and characterization of human Twinkle helicase in mitochondrial disease.

Riccio, A.A.Bouvette, J.Perera, L.Longley, M.J.Krahn, J.M.Williams, J.G.Dutcher, R.Borgnia, M.J.Copeland, W.C.

(2022) Proc Natl Acad Sci U S A 119: e2207459119-e2207459119

  • DOI: https://doi.org/10.1073/pnas.2207459119

  • PubMed Abstract: 

    Twinkle is the mammalian helicase vital for replication and integrity of mitochondrial DNA. Over 90 Twinkle helicase disease variants have been linked to progressive external ophthalmoplegia and ataxia neuropathies among other mitochondrial diseases. Despite the biological and clinical importance, Twinkle represents the only remaining component of the human minimal mitochondrial replisome that has yet to be structurally characterized. Here, we present 3-dimensional structures of human Twinkle W315L. Employing cryo-electron microscopy (cryo-EM), we characterize the oligomeric assemblies of human full-length Twinkle W315L, define its multimeric interface, and map clinical variants associated with Twinkle in inherited mitochondrial disease. Cryo-EM, crosslinking-mass spectrometry, and molecular dynamics simulations provide insight into the dynamic movement and molecular consequences of the W315L clinical variant. Collectively, this ensemble of structures outlines a framework for studying Twinkle function in mitochondrial DNA replication and associated disease states.


  • Organizational Affiliation

    Mitochondrial DNA Replication group, Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Twinkle mtDNA helicase
A, B, C, D, E
A, B, C, D, E, F, G, H
695Homo sapiensMutation(s): 1 
Gene Names: TWNKC10orf2PEO1
EC: 3.6.4.12
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RR1 (Homo sapiens)
Explore Q96RR1 
Go to UniProtKB:  Q96RR1
PHAROS:  Q96RR1
GTEx:  ENSG00000107815 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96RR1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesZ01 ES065078
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesZ01 ES065080

Revision History  (Full details and data files)

  • Version 1.0: 2022-07-27
    Type: Initial release
  • Version 1.1: 2022-08-24
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection