6CFO

HUMAN PYRUVATE DEHYDROGENASE E1 COMPONENT COMPLEX WITH COVALENT TDP ADDUCT ACETYL PHOSPHINATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Pyruvate dehydrogenase complex deficiency is linked to regulatory loop disorder in the alpha V138M variant of human pyruvate dehydrogenase.

Whitley, M.J.Arjunan, P.Nemeria, N.S.Korotchkina, L.G.Park, Y.H.Patel, M.S.Jordan, F.Furey, W.

(2018) J Biol Chem 293: 13204-13213

  • DOI: https://doi.org/10.1074/jbc.RA118.003996
  • Primary Citation of Related Structures:  
    6CER, 6CFO

  • PubMed Abstract: 

    The pyruvate dehydrogenase multienzyme complex (PDHc) connects glycolysis to the tricarboxylic acid cycle by producing acetyl-CoA via the decarboxylation of pyruvate. Because of its pivotal role in glucose metabolism, this complex is closely regulated in mammals by reversible phosphorylation, the modulation of which is of interest in treating cancer, diabetes, and obesity. Mutations such as that leading to the αV138M variant in pyruvate dehydrogenase, the pyruvate-decarboxylating PDHc E1 component, can result in PDHc deficiency, an inborn error of metabolism that results in an array of symptoms such as lactic acidosis, progressive cognitive and neuromuscular deficits, and even death in infancy or childhood. Here we present an analysis of two X-ray crystal structures at 2.7-Å resolution, the first of the disease-associated human αV138M E1 variant and the second of human wildtype (WT) E1 with a bound adduct of its coenzyme thiamin diphosphate and the substrate analogue acetylphosphinate. The structures provide support for the role of regulatory loop disorder in E1 inactivation, and the αV138M variant structure also reveals that altered coenzyme binding can result in such disorder even in the absence of phosphorylation. Specifically, both E1 phosphorylation at αSer-264 and the αV138M substitution result in disordered loops that are not optimally oriented or available to efficiently bind the lipoyl domain of PDHc E2. Combined with an analysis of αV138M activity, these results underscore the general connection between regulatory loop disorder and loss of E1 catalytic efficiency.


  • Organizational Affiliation

    From the Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pyruvate dehydrogenase E1 component subunit alpha, somatic form, mitochondrial
A, C
365Homo sapiensMutation(s): 0 
Gene Names: PDHA1PHE1A
EC: 1.2.4.1
UniProt & NIH Common Fund Data Resources
Find proteins for P08559 (Homo sapiens)
Explore P08559 
Go to UniProtKB:  P08559
PHAROS:  P08559
GTEx:  ENSG00000131828 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08559
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Pyruvate dehydrogenase E1 component subunit beta, mitochondrial
B, D
341Homo sapiensMutation(s): 0 
Gene Names: PDHBPHE1B
EC: 1.2.4.1
UniProt & NIH Common Fund Data Resources
Find proteins for P11177 (Homo sapiens)
Explore P11177 
Go to UniProtKB:  P11177
PHAROS:  P11177
GTEx:  ENSG00000168291 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11177
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.27α = 90
b = 120.73β = 90
c = 129.78γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesDK080748

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-11
    Type: Initial release
  • Version 1.1: 2018-07-18
    Changes: Data collection, Database references
  • Version 1.2: 2018-09-05
    Changes: Data collection, Database references
  • Version 1.3: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.5: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description