Phosphatase

PP2A structural importance, regulation and its aberrant expression in cancer

Parthasarathy Seshacharyulu, Poomy Pandey, Kaustubh Datta, Surinder Kumar Batra

Research output: Contribution to journalShort survey

185 Citations (Scopus)

Abstract

Protein Phosphatase 2A (PP2A) is an important and ubiquitously expressed serine threonine phosphatase and regulates the function by dephosphorylating many critical cellular molecules like Akt, p53, c-Myc and β-catenin. It plays a critical role in cellular processes, such as cell proliferation, signal transduction and apoptosis. Structurally, it is multifarious as it is composed of catalytic, scaffold and regulatory subunits. The catalytic and scaffold subunits have two isoforms and the regulatory subunit has four different families containing different isoforms. The regulatory subunit is the most diverse with temporal and spatial specificity. PP2A undergoes post-translational modifications (i.e. phosphorylation and methylation), which in turn, regulates its enzymatic activity. Aberrant expression, mutations and somatic alterations of the PP2A scaffold and regulatory subunits have been observed in various human malignancies, including lung, breast, skin and colon cancer, highlighting its role as a 'tumor suppressor'. This review is focused on the structural complexity of serine/threonine phosphatase PP2A and summarizes its expression pattern in cancer. Additionally, the PP2A interacting and regulatory proteins and substrates are also discussed. Finally, the mouse models developed to understand the biological role of PP2A subunits in an in vivo model system are also reviewed in this article.

Original languageEnglish (US)
Pages (from-to)9-18
Number of pages10
JournalCancer Letters
Volume335
Issue number1
DOIs
StatePublished - Jul 10 2013

Fingerprint

Protein Phosphatase 2
Phosphoric Monoester Hydrolases
Neoplasms
Phosphoprotein Phosphatases
Protein Isoforms
Catenins
Skin Neoplasms
Post Translational Protein Processing
Colonic Neoplasms
Methylation
Signal Transduction
Lung Neoplasms
Catalytic Domain
Phosphorylation
Cell Proliferation
Apoptosis
Breast Neoplasms
Mutation
Proteins

Keywords

  • Dephosphorylation
  • Holoenzyme
  • PP2A subunits
  • Phosphorylation
  • Protein phosphatase type 2A (PP2A)
  • Signaling

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Phosphatase : PP2A structural importance, regulation and its aberrant expression in cancer. / Seshacharyulu, Parthasarathy; Pandey, Poomy; Datta, Kaustubh; Batra, Surinder Kumar.

In: Cancer Letters, Vol. 335, No. 1, 10.07.2013, p. 9-18.

Research output: Contribution to journalShort survey

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