1Y8O

Crystal structure of the PDK3-L2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.210 

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:  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 se ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
[Pyruvate dehydrogenase [lipoamide]] kinase isozyme 3
A
419Homo sapiensGene Names: PDK3 (PDHK3)
EC: 2.7.11.2
Find proteins for Q15120 (Homo sapiens)
Go to Gene View: PDK3
Go to UniProtKB:  Q15120
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex
B
128Homo sapiensGene Names: DLAT (DLTA)
EC: 2.3.1.12
Find proteins for P10515 (Homo sapiens)
Go to Gene View: DLAT
Go to UniProtKB:  P10515
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
RED
Query on RED

Download SDF File 
Download CCD File 
B
DIHYDROLIPOIC ACID
C8 H16 O2 S2
IZFHEQBZOYJLPK-SSDOTTSWSA-N
 Ligand Interaction
ADP
Query on ADP

Download SDF File 
Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ADPKd: 1300 nM BINDINGMOAD
ADPKd: 1300 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.210 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 120.752α = 90.00
b = 120.752β = 90.00
c = 239.153γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
REFMACrefinement
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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