4NY3 image
Entry Detail
PDB ID:
4NY3
Title:
Human PTPA in complex with peptide
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-12-10
Release Date:
2014-07-23
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Serine/threonine-protein phosphatase 2A activator
Chain IDs:A, B
Chain Length:304
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
Chain IDs:C, D
Chain Length:6
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Structural basis for PTPA interaction with the invariant C-terminal tail of PP2A.
Biol.Chem. 395 881 889 (2014)
PMID: 25003389 DOI: 10.1515/hsz-2014-0106

Abstact

Protein phosphatase 2A (PP2A) is a highly abundant heterotrimeric Ser/Thr phosphatase involved in the regulation of a variety of signaling pathways. The PP2A phosphatase activator (PTPA) is an ATP-dependent activation chaperone, which plays a key role in the biogenesis of active PP2A. The C-terminal tail of the catalytic subunit of PP2A is highly conserved and can undergo a number of posttranslational modifications that serve to regulate the function of PP2A. Here we have studied structurally the interaction of PTPA with the conserved C-terminal tail of the catalytic subunit carrying different posttranslational modifications. We have identified an additional interaction site for the invariant C-terminal tail of the catalytic subunit on PTPA, which can be modulated via posttranslational modifications. We show that phosphorylation of Tyr307(PP2A-C) or carboxymethylation of Leu309(PP2A-C) abrogates or diminishes binding of the C-terminal tail, whereas phosphorylation of Thr304(PP2A-C) is of no consequence. We suggest that the invariant C-terminal residues of the catalytic subunit can act as affinity enhancer for different PP2A interaction partners, including PTPA, and a different 'code' of posttranslational modifications can favour interactions to one subunit over others.

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