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Serine/threonine-protein phosphatase 5



Oryctolagus cuniculus (Rabbit)
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at protein leveli


Serine/threonine-protein phosphatase that dephosphorylates a myriad of proteins involved in different signaling pathways including the kinases CSNK1E, ASK1/MAP3K5, PRKDC and RAF1, the nuclear receptors NR3C1, PPARG, ESR1 and ESR2, SMAD proteins and TAU/MAPT. Implicated in wide ranging cellular processes, including apoptosis, differentiation, DNA damage response, cell survival, regulation of ion channels or circadian rhythms, in response to steroid and thyroid hormones, calcium, fatty acids, TGF-beta as well as oxidative and genotoxic stresses. Participates in the control of DNA damage response mechanisms such as checkpoint activation and DNA damage repair through, for instance, the regulation ATM/ATR-signaling and dephosphorylation of PRKDC and TP53BP1. Inhibits ASK1/MAP3K5-mediated apoptosis induced by oxidative stress. Plays a positive role in adipogenesis, mainly through the dephosphorylation and activation of PPARG transactivation function. Also dephosphorylates and inhibits the anti-adipogenic effect of NR3C1. Regulates the circadian rhythms, through the dephosphorylation and activation of CSNK1E. May modulate TGF-beta signaling pathway by the regulation of SMAD3 phosphorylation and protein expression levels. Dephosphorylates and may play a role in the regulation of TAU/MAPT. Through their dephosphorylation, may play a role in the regulation of ions channels such as KCNH2.1 Publication

Catalytic activityi

[a protein]-serine/threonine phosphate + H2O = [a protein]-serine/threonine + phosphate.


Mg2+By similarity, Mn2+By similarityNote: Binds 2 magnesium or manganese ions per subunit.By similarity

Enzyme regulationi

Autoinhibited. In the autoinhibited state, the TPR domain interacts with the catalytic region and prevents substrate access to the catalytic pocket. Allosterically activated by various polyunsaturated fatty acids, free long-chain fatty-acids and long-chain fatty acyl-CoA esters, arachidonic acid being the most effective activator. HSP90A and probably RAC1, GNA12 and GNA13 can also release the autoinhibition by the TPR repeat. Activation by RAC1, GNA12 and GNA13 is synergistic with the one produced by fatty acids binding. Inhibited by okadaic acid.1 Publication

GO - Molecular functioni

Complete GO annotation...

Keywords - Molecular functioni

Hydrolase, Protein phosphatase

Keywords - Ligandi

Magnesium, Manganese, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Serine/threonine-protein phosphatase 5 (EC:
Short name:
Alternative name(s):
Protein phosphatase T
Short name:
Gene namesi
OrganismiOryctolagus cuniculus (Rabbit)
Taxonomic identifieri9986 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresGliresLagomorphaLeporidaeOryctolagus
  • UP000001811 Componenti: Unplaced

Subcellular locationi

  • Nucleus By similarity
  • Cytoplasm By similarity
  • Cell membrane By similarity

  • Note: Predominantly nuclear. But also present in the cytoplasm. Translocates from the cytoplasm to the plasma membrane in a RAC1-dependent manner.By similarity

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cell membrane, Cytoplasm, Membrane, Nucleus

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini‹1 – 42›42Serine/threonine-protein phosphatase 5PRO_0000058896Add

Post-translational modificationi

Activated by at least two different proteolytic cleavages producing a 56 kDa and a 50 kDa form.1 Publication


Subunit structurei

Interacts with CPNE1 (via VWFA domain) (By similarity). Part of a complex with HSP90/HSP90AA1 and steroid receptors. Interacts with CDC16, CDC27. Interacts with KLHDC10 (via the 6 Kelch repeats); inhibits the phosphatase activity on MAP3K5. Interacts (via TPR repeats) with HSP90AA1 (via TPR repeat-binding motif) or HSPA1A/HSPA1B; the interaction is direct and activates the phosphatase activity. Dissociates from HSPA1A/HSPA1B and HSP90AA1 in response to arachidonic acid. Interacts with ATM and ATR; both interactions are induced by DNA damage and enhance ATM and ATR kinase activity. Interacts with RAD17; reduced by DNA damage. Interacts with nuclear receptors such as NR3C1/GCR and PPARG (activated by agonist); regulates their transactivation activities. Interacts (via TPR repeats) with S100 proteins S100A1, S100A2, S100A6, S100B and S100P; the interactions are calcium-dependent, strongly activate PPP5C phosphatase activity and compete with HSP90AA1 and MAP3K5 interactions. Interacts with SMAD2 and SMAD3 but not with SMAD1; decreases SMAD3 phosphorylation and protein levels. Interacts (via TPR repeats) with CRY1 and CRY2; the interaction with CRY2 downregulates the phosphatase activity on CSNK1E. Interacts (via TPR repeats) with the active form of RAC1, GNA12 or GNA13; these interactions activate the phosphatase activity and translocate PPP5C to the cell membrane.By similarity1 Publication

Protein-protein interaction databases



3D structure databases


Family & Domainsi


Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Regioni38 – 425Required for autoinhibitionBy similarity

Sequence similaritiesi

Phylogenomic databases

eggNOGiKOG0376. Eukaryota.
COG0639. LUCA.


Sequence statusi: Fragment.

P55739-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40 
Mass (Da):4,719
Last modified:November 1, 1997 - v1

Experimental Info

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Non-terminal residuei1 – 11


3D structure databases


Protein-protein interaction databases


Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Phylogenomic databases

eggNOGiKOG0376. Eukaryota.
COG0639. LUCA.

Family and domain databases


Entry informationi

Entry nameiPPP5_RABIT
AccessioniPrimary (citable) accession number: P55739
Entry historyi
Integrated into UniProtKB/Swiss-Prot: November 1, 1997
Last sequence update: November 1, 1997
Last modified: October 5, 2016
This is version 78 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program


Keywords - Technical termi

Complete proteome, Reference proteome


  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.