2BDX

X-ray Crystal Structure of dihydromicrocystin-LA bound to Protein Phosphatase-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal Structures of Protein Phosphatase-1 Bound to Motuporin and Dihydromicrocystin-LA: Elucidation of the Mechanism of Enzyme Inhibition by Cyanobacterial Toxins.

Maynes, J.T.Luu, H.A.Cherney, M.M.Andersen, R.J.Williams, D.Holmes, C.F.James, M.N.

(2006) J.Mol.Biol. 356: 111-120

  • DOI: 10.1016/j.jmb.2005.11.019
  • Primary Citation of Related Structures:  2BCD

  • PubMed Abstract: 
  • The microcystins and nodularins are tumour promoting hepatotoxins that are responsible for global adverse human health effects and wildlife fatalities in countries where drinking water supplies contain cyanobacteria. The toxins function by inhibiting ...

    The microcystins and nodularins are tumour promoting hepatotoxins that are responsible for global adverse human health effects and wildlife fatalities in countries where drinking water supplies contain cyanobacteria. The toxins function by inhibiting broad specificity Ser/Thr protein phosphatases in the host cells, thereby disrupting signal transduction pathways. A previous crystal structure of a microcystin bound to the catalytic subunit of protein phosphatase-1 (PP-1c) showed distinct changes in the active site region when compared with protein phosphatase-1 structures bound to other toxins. We have elucidated the crystal structures of the cyanotoxins, motuporin (nodularin-V) and dihydromicrocystin-LA bound to human protein phosphatase-1c (gamma isoform). The atomic structures of these complexes reveal the structural basis for inhibition of protein phosphatases by these toxins. Comparisons of the structures of the cyanobacterial toxin:phosphatase complexes explain the biochemical mechanism by which microcystins but not nodularins permanently modify their protein phosphatase targets by covalent addition to an active site cysteine residue.


    Organizational Affiliation

    Canadian Institutes of Health Research, Group in Protein Structure and Function Department of Biochemistry, Faculty of Medicine, University of Alberta, Edmonton, Alta, Canada T6G 2H7.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine protein phosphatase PP1-gamma catalytic subunit
A
323Homo sapiensGene Names: PPP1CC
EC: 3.1.3.16
Find proteins for P36873 (Homo sapiens)
Go to Gene View: PPP1CC
Go to UniProtKB:  P36873
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DIHYDROMICROCYSTIN-LA
B
7N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000215
Query on PRD_000215
BDIHYDROMICROCYSTIN-LAOligopeptide / Toxin

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.212 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 99.978α = 90.00
b = 99.978β = 90.00
c = 62.949γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
REFMACrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling
AMoREphasing
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-17
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2011-07-27
    Type: Version format compliance
  • Version 1.4: 2012-12-12
    Type: Other