Difference between revisions of "Phosphatase Subfamily PPP5C"

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(Evolution)
 
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[[Phosphatase classification|Phosphatase Classification]]: [[Phosphatase_Fold_MTDP|Fold MTDP]]: [[Phosphatase_Superfamily_MTDP|Superfamily MTDP]]: [[Phosphatase_Family_PPP|Family PPP]]: [[Phosphatase_Subfamily_PPP5C|Subfamily PPP5C]]
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[[Phosphatase classification|Phosphatase Classification]]: [[Phosphatase_Fold_PPPL|Fold PPPL]]: [[Phosphatase_Superfamily_PPPL|Superfamily PPPL]]: [[Phosphatase_Family_PPP|Family PPP]]: [[Phosphatase_Subfamily_PPP5C|Subfamily PPP5C]]
  
 
=== Evolution ===
 
=== Evolution ===
The PPP5C subfamily is found throughout eukaryotes, including [[Phosphatase_Glossary#Opisthokonta|opisthokonta]], amoebazoa, plants and etc. PPP5Cs have tandem tetratricopeptide repeat (TPR) structural motifs at N-terminal, which distinguish them from other PPP subfamilies.
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The PPP5C subfamily is found throughout eukaryotes. PPP5Cs have tandem tetratricopeptide repeat (TPR) structural motifs at N-terminal, which distinguish them from other PPP subfamilies, and were used to classify PPP5C in yeast and Dictyostelium in phosphatome.net database.
  
 
=== Domain ===
 
=== Domain ===
The PPP5C subfamily has tandem tetratricopeptide repeat (TPR), a structural motif, at N-terminal and phosphatase domain at C-terminal.  
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PPP5Cs typically have tandem [[Protein_Domain#TPR|tetratricopeptide repeats (TPRs)]] at N-terminal and phosphatase domain at C-terminal. Dictyostelium has an additional but partial TPR of ~30 aa residues.
  
 
=== Functions ===
 
=== Functions ===
PP5 is widely expressed but at a lower level than most other serine/threonine protein phosphatases in mammals, and it is highly conserved among other eukaryotes [2], [3]. Unlike most other phosphatases having isoforms encoded by different genes, the regulatory and catalytic domains of PP5 are combined within the same chain. PP5 contains three tetratricopeptide repeat (TPR) motifs at its N-terminus which serve as protein-protein interaction motifs. Removal of the TPR domains by limited proteolysis leads to a substantially elevated phosphatase activity [4], and recent structural analyses indicate that the access to the active site of the phosphatase is blocked by TPR domains [5]. Moreover, TPR domains are also involved in the stimulation of PP5 activity via interaction with polyunsaturated fatty acids [4], [6]. Mammalian PP5 has been found to play an important role in hormone and stress induced signaling, DNA repair, intracellular proliferation, differentiation, migration, survival and death [7]–[9]. However, knowledge about PP5 in insects is poorly known.
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PPP5C is the catalytic subunit of holoenzyme PP5, the function of which is reviewed at <cite>zhong11</cite>.
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PPP5C also known as Protein Phospahtase 5 (PP5) is unique among PPP family members in that its catalytic and regulatory domains are contained in the same polypeptide chain. It has a tetratricopeptide repeat (TPR) domain which maintains the phosphatase in an auto-inhibited conformation that is neutralized when the heat shock protein Hsp90, or fatty acids, bind to this region. ε.
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The phosphatase interacts with various proteins and participate in multiple signaling pathways. The phosphatase interacts with ATM, ATR, 53BP1, and DNA-depdent protein kianse catalytic subunits (DNA-PKc) following DNA damage. While enchance the activity of ATM and ATR, the phosphatase negatively regulates 53BP1 and DNA-PKc by dephosphorylating them. It regulates Raf-MEK-ERK pathway via inhibiting Raf-1 by dephosphorylating Serine 338. PPP5 is involved in mammalian circadian clock by activating the major clock kinae casein kinase I (CKI) ε. In addition, the elevated levels of this phosphatase may be associated with breast cancer development.
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Measles virus infection inactivates Cellular PP5 with Consequent Suppression of Sp1 and c-Myc Activities <cite>Sato15</cite>.
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=== References ===
 
=== References ===
 
<biblio>
 
<biblio>
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#Sato15 pmid=26157124
 
#zhong11 pmid=21451261
 
#zhong11 pmid=21451261
 
</biblio>
 
</biblio>

Latest revision as of 15:10, 22 March 2017

Phosphatase Classification: Fold PPPL: Superfamily PPPL: Family PPP: Subfamily PPP5C

Evolution

The PPP5C subfamily is found throughout eukaryotes. PPP5Cs have tandem tetratricopeptide repeat (TPR) structural motifs at N-terminal, which distinguish them from other PPP subfamilies, and were used to classify PPP5C in yeast and Dictyostelium in phosphatome.net database.

Domain

PPP5Cs typically have tandem tetratricopeptide repeats (TPRs) at N-terminal and phosphatase domain at C-terminal. Dictyostelium has an additional but partial TPR of ~30 aa residues.

Functions

PPP5C is the catalytic subunit of holoenzyme PP5, the function of which is reviewed at [1].

PPP5C also known as Protein Phospahtase 5 (PP5) is unique among PPP family members in that its catalytic and regulatory domains are contained in the same polypeptide chain. It has a tetratricopeptide repeat (TPR) domain which maintains the phosphatase in an auto-inhibited conformation that is neutralized when the heat shock protein Hsp90, or fatty acids, bind to this region. ε.

The phosphatase interacts with various proteins and participate in multiple signaling pathways. The phosphatase interacts with ATM, ATR, 53BP1, and DNA-depdent protein kianse catalytic subunits (DNA-PKc) following DNA damage. While enchance the activity of ATM and ATR, the phosphatase negatively regulates 53BP1 and DNA-PKc by dephosphorylating them. It regulates Raf-MEK-ERK pathway via inhibiting Raf-1 by dephosphorylating Serine 338. PPP5 is involved in mammalian circadian clock by activating the major clock kinae casein kinase I (CKI) ε. In addition, the elevated levels of this phosphatase may be associated with breast cancer development.

Measles virus infection inactivates Cellular PP5 with Consequent Suppression of Sp1 and c-Myc Activities [2].


References

  1. Zhong J, Liao J, Liu X, Wang P, Liu J, Hou W, Zhu B, Yao L, Wang J, Li J, Stark JM, Xie Y, and Xu X. Protein phosphatase PP6 is required for homology-directed repair of DNA double-strand breaks. Cell Cycle. 2011 May 1;10(9):1411-9. DOI:10.4161/cc.10.9.15479 | PubMed ID:21451261 | HubMed [zhong11]
  2. Sato H, Yoneda M, Honma R, Ikeda F, Watanabe S, and Kai C. Measles Virus Infection Inactivates Cellular Protein Phosphatase 5 with Consequent Suppression of Sp1 and c-Myc Activities. J Virol. 2015 Oct;89(19):9709-18. DOI:10.1128/JVI.00825-15 | PubMed ID:26157124 | HubMed [Sato15]
All Medline abstracts: PubMed | HubMed