1Y8N

Crystal structure of the PDK3-L2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of pyruvate dehydrogenase kinase 3 bound to lipoyl domain 2 of human pyruvate dehydrogenase complex.

Kato, M.Chuang, J.L.Tso, S.C.Wynn, R.M.Chuang, D.T.

(2005) EMBO J 24: 1763-1774

  • DOI: 10.1038/sj.emboj.7600663
  • Primary Citation of Related Structures:  
    1Y8O, 1Y8N, 1Y8P

  • PubMed Abstract: 
  • The human pyruvate dehydrogenase complex (PDC) is regulated by reversible phosphorylation by four isoforms of pyruvate dehydrogenase kinase (PDK). PDKs phosphorylate serine residues in the dehydrogenase (E1p) component of PDC, but their amino-acid sequen ...

    The human pyruvate dehydrogenase complex (PDC) is regulated by reversible phosphorylation by four isoforms of pyruvate dehydrogenase kinase (PDK). PDKs phosphorylate serine residues in the dehydrogenase (E1p) component of PDC, but their amino-acid sequences are unrelated to eukaryotic Ser/Thr/Tyr protein kinases. PDK3 binds to the inner lipoyl domains (L2) from the 60-meric transacetylase (E2p) core of PDC, with concomitant stimulated kinase activity. Here, we present crystal structures of the PDK3-L2 complex with and without bound ADP or ATP. These structures disclose that the C-terminal tail from one subunit of PDK3 dimer constitutes an integral part of the lipoyl-binding pocket in the N-terminal domain of the opposing subunit. The two swapped C-terminal tails promote conformational changes in active-site clefts of both PDK3 subunits, resulting in largely disordered ATP lids in the ADP-bound form. Our structural and biochemical data suggest that L2 binding stimulates PDK3 activity by disrupting the ATP lid, which otherwise traps ADP, to remove product inhibition exerted by this nucleotide. We hypothesize that this allosteric mechanism accounts, in part, for E2p-augmented PDK3 activity.


    Organizational Affiliation

    Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
[Pyruvate dehydrogenase [lipoamide]] kinase isozyme 3 A419Homo sapiensMutation(s): 0 
Gene Names: PDK3PDHK3
EC: 2.7.1.99 (PDB Primary Data), 2.7.11.2 (UniProt)
Find proteins for Q15120 (Homo sapiens)
Explore Q15120 
Go to UniProtKB:  Q15120
NIH Common Fund Data Resources
PHAROS:  Q15120
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex B128Homo sapiensMutation(s): 0 
Gene Names: DLATDLTA
EC: 2.3.1.12
Find proteins for P10515 (Homo sapiens)
Explore P10515 
Go to UniProtKB:  P10515
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PHAROS:  P10515
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
RED
Query on RED

Download Ideal Coordinates CCD File 
B
DIHYDROLIPOIC ACID
C8 H16 O2 S2
IZFHEQBZOYJLPK-SSDOTTSWSA-N
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.806α = 90
b = 120.806β = 90
c = 238.587γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2011-10-05
    Changes: Non-polymer description