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DPF2 regulates OCT4 protein level and nuclear distribution

Chao Liu1, Dijuan Zhang2, Yuxian Shen3

  • 1Department of Histology and Embryology, Institute of Stem Cell and Tissue Engineering, School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui 230032 China; Center for Biomedical Engineering and Technology (BioMET), University of Maryland, Baltimore, MD 21201 USA.

Biochimica Et Biophysica Acta
|September 30, 2015
PubMed

Insights

DPF2 protein regulates levels of OCT4 (octamer-binding transcription factor 4), a key factor in embryonic development and cancer. DPF2 acts as an E3 ligase, promoting OCT4 ubiquitination and degradation, thus controlling its nuclear distribution.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Oncology

Background:

  • Octamer-binding transcription factor 4 (OCT4) is crucial for mammalian embryonic development and oncogenesis.
  • Regulation of OCT4 protein levels and nuclear distribution is not fully understood.
  • DPF2, a plant homeodomain finger protein, is implicated in cellular processes.

Purpose of the Study:

  • To investigate the role of DPF2 in regulating OCT4 protein expression and nuclear localization.
  • To elucidate the mechanism by which DPF2 affects OCT4 levels and stability.
  • To understand the implications of DPF2-OCT4 interaction in cellular differentiation.

Main Methods:

  • Immunoprecipitation and GST-pull down assays to confirm DPF2-OCT4 interaction.
  • In vitro ubiquitination assays to assess DPF2's ligase activity.
  • siRNA-mediated knockdown of DPF2 in P19 and H9 cells.
  • Overexpression studies in 293 cells to analyze DPF2's effect on OCT4 ubiquitination and degradation.
  • Analysis of OCT4 ubiquitination linkage (Ub-K48).

Main Results:

  • DPF2 interacts with OCT4 and functions as an E3 ligase, promoting OCT4 ubiquitination and degradation.
  • Knockdown of DPF2 increases OCT4 protein levels and stability.
  • DPF2 regulates OCT4 nuclear distribution, independent of its ligase activity.
  • DPF2 specifically mediates K48-linked poly-ubiquitination of OCT4, leading to its proteasomal degradation.

Conclusions:

  • DPF2 plays a significant role in controlling OCT4 protein homeostasis and nuclear localization.
  • The DPF2-mediated ubiquitination pathway is a key regulatory mechanism for OCT4.
  • Understanding this regulation provides insights into embryonic development and oncogenesis.
Keywords:
DPF2E3OCT4PHD fingerUbiquitination

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