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  Domain Name: PTPA
Phosphotyrosyl phosphatase activator (PTPA) is also known as protein phosphatase 2A (PP2A) phosphatase activator. PTPA is an essential, well conserved protein that stimulates the tyrosyl phosphatase activity of PP2A. It also reactivates the serine/threonine phosphatase activity of an inactive form of PP2A. Together, PTPA and PP2A constitute an ATPase. It has been suggested that PTPA alters the relative specificity of PP2A from phosphoserine/phosphothreonine substrates to phosphotyrosine substrates in an ATP-hydrolysis-dependent manner. Basal expression of PTPA is controlled by the transcription factor Yin Yang1 (YY1). PTPA has been suggested to play a role in the insertion of metals to the PP2A catalytic subunit (PP2Ac) active site, to act as a chaperone, and more recently, to have peptidyl prolyl cis/trans isomerase activity that specifically targets human PP2Ac.
No pairwise interactions are available for this conserved domain.

Total Mutations Found: 0
Total Disease Mutations Found: 0
This domain occurred 1 times on human genes (7 proteins).

 If you've navigated here from a protein, hovering over a position on the weblogo will display the corresponding protein position for that domain position.

 The histograms below the weblogo indicate mutations found on the domain. Red is for disease (OMIM) and blue is for SNPs.

 Functional Features are displayed as orange boxes under the histograms. You can choose which features are displayed in the box below.

Range on the Protein:  

   Protein ID            Protein Position

Domain Position:  

Feature Name:Total Found:
peptide binding pocket
peptide-induced dimer int
ATP binding site
putative PP2A binding sur
putative interaction site

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Please Cite: Peterson, T.A., Adadey, A., Santana-Cruz ,I., Sun, Y., Winder A, Kann, M.G., (2010) DMDM: Domain Mapping of Disease Mutations. Bioinformatics 26 (19), 2458-2459.

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