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A phosphatase is an enzyme that removes a phosphate group from its substrate by hydrolysing phosphoric acid monoesters into a phosphate ion and a molecule with a free hydroxyl group (see dephosphorylation). This action is directly opposite to that of phosphorylases and kinases, which attach phosphate groups to their substrates by using energetic molecules like ATP. A common phosphatase in many organisms is alkaline phosphatase.

Phosphatases can be categorised into two main categories: Cysteine-dependent Phosphatases (CDPs) and metallo-phosphatases (which are dependent on metal ions in their active sites for activity).


CDPs catalyse the hydrolysis of a phosphoester bond via a phospho-cysteine intermediate [1].


Mechanism of Tyrosine dephosphorylation by a CDP

The free cysteine nucleophile forms a bond with the phosphorus atom of the phosphate moiety, and the P-O bond linking the phosphate group to the tyrosine is protonated, either by a suitably positioned acidic amino acid residue (Asp in the diagram below) or a water molecule. The phospho-cysteine intermediate is then hydrolysed by another water molecule, thus regenerating the active site for another dephosphorylation reaction.

Metallo-phosphatases (eg PP2C) co-ordinate 2 catalytically essential metal ions within their active site. There is currently some confusion of the identity of these metal ions, as successive attempts to identify them yield different answers. There is currently evidence that these metals could be Magnesium, Manganese, Iron, Zinc, or any combination thereof. It is thought that a hydroxyl ion bridging the two metal ions takes part in nucleophilic attack on the phosphorus ion.


Phosphatases can be subdivided based upon their substrate specificity.

Class Example Substrate Reference
Tyrosine-specific phosphatases PTP1B Phospho-Tyrosine [2]
Serine/Threonine specific phosphatases PP2C Phospho-Serine/Threonine [3]
Dual Specificity Phosphatases VHR Phospho-Tyrosine/Serine/Threonine [4]
Histidine Phosphatase PHP Phospho-Histidine [5]
Lipid Phosphatase PTEN Phosphatidyl-Inositol-3,4,5-Triphosphate [6]

Physiological Relevance

Phosphatases act in opposition to kinases/phosphorylases, which add phosphate groups to proteins. The addition of a phosphate group may activate or de-activate an enzyme (e.g., Kinase signalling pathways[7] ) or enable a protein-protein interaction to occur (e.g., SH3 domains [8]); therefore phosphatases are integral to many signal transduction pathways. It should be noted that phosphate addition and removal do not necessarily correspond to enzyme activation or inhibition, and that several enzymes have separate phosphorylation sites for activating or inhibiting functional regulation. CDK, for example, can be either activated or deactivated depending on the specific amino acid residue being phosphorylated. Phosphates are important in signal transduction because they regulate the proteins to which they are attached. To reverse the regulatory effect, the phosphate is removed. This occurs on its own by hydrolysis, or is mediated by protein phosphatases.

Protein Phosphatases

Serine/threonine-specific protein phosphatases

Serine and threonine phosphates are stable under physiological conditions, so a phosphatase has to remove the phosphate to reverse the regulation. There are four known groups:

  1. PP1 (α, β, γ1, γ2)
  2. PP2A
  3. PP2B (AKA calcineurin)
  4. PP2C
  5. PP4
  6. PP5

The first three have sequence homology in the catalytic domain, but differ in substrate specifity.

Ser/Thr-specific protein phosphatases are regulated by their location within the cell and by specific inhibitor proteins.

Phosphatases and bipolar disorder

Phosphates and depression

See also


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