3E7B image
Entry Detail
PDB ID:
3E7B
Keywords:
Title:
Crystal Structure of Protein Phosphatase-1 Bound to the natural toxin inhibitor Tautomycin
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2008-08-18
Release Date:
2008-11-04
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Serine/threonine-protein phosphatase PP1-alpha catalytic subunit
Chain IDs:A, B
Chain Length:299
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Crystal structures of protein phosphatase-1 bound to nodularin-R and tautomycin: a novel scaffold for structure-based drug design of serine/threonine phosphatase inhibitors
J.Mol.Biol. 385 11 21 (2009)
PMID: 18992256 DOI: 10.1016/j.jmb.2008.10.053

Abstact

Protein phosphatase 1 occurs in all tissues and regulates many pathways, ranging from cell-cycle progression to carbohydrate metabolism. Many naturally occurring, molecular toxins modulate PP1 activity, though the exact mechanism of this differential regulation is not understood. A detailed elucidation of these interactions is crucial for understanding the cellular basis of phosphatase function and signaling pathways but, more importantly, they can serve as the basis for highly specific therapeutics, e.g. against cancer. We report the crystal structures of PP1 in complex with nodularin-R at 1.63 A and tautomycin at 1.70 A resolution. The PP1:nodularin-R complex was used to demonstrate the utility of our improved PP1 production technique, which produces highly active, soluble PP1. Tautomycin is one of the few toxins that reportedly preferentially binds PP1>PP2A. Therefore, the PP1:tautomycin structure is the first complex structure with a toxin with preferred PP1 specificity. Furthermore, since tautomycin is a linear non-peptide-based toxin, our reported structure will aid the design of lead compounds for novel PP1-specific pharmaceuticals.

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