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Genomic structure of the mouse PP4 gene: a developmentally regulated protein phosphatase

M C Hu1, J W Shui, K A Mihindukulasuriya

  • 1Department of Molecular and Cellular Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA. michu@mdanderson.org

Gene
|November 15, 2001
PubMed

Insights

Researchers cloned and characterized the murine serine/threonine protein phosphatase 4 (PP4), revealing identical amino acid sequences to human PP4. This protein phosphatase is conserved across species and differentially expressed during embryonic development.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Protein phosphatases are crucial regulators of cellular processes.
  • Serine/threonine protein phosphatase 4 (PP4), also known as PPX, is a key enzyme in cellular signaling pathways.

Purpose of the Study:

  • To clone and characterize the murine cDNA and genomic DNA encoding PP4.
  • To investigate the structure, function, and regulation of PP4.
  • To analyze the expression pattern of PP4 in murine tissues and embryos.

Main Methods:

  • Cloning of murine cDNA and genomic DNA for PP4.
  • Sequence analysis of protein, cDNA, and genomic PP4.
  • Genomic Southern blotting to assess species conservation.
  • Northern blotting and in situ hybridization for expression analysis.

Main Results:

  • Murine and human PP4 share identical amino acid sequences despite distinct nucleotide sequences.
  • Genomic Southern blots confirmed PP4 conservation across species.
  • PP4 is highly expressed in adult testis, kidney, liver, and lung, with lower expression in most other tissues.
  • PP4 exhibits differential expression during murine embryonic development.

Conclusions:

  • PP4 is a conserved serine/threonine protein phosphatase with identical protein sequences in mice and humans.
  • The expression patterns suggest PP4 plays a significant role in adult tissues and embryonic development.
  • Further research into PP4's structure, function, and regulation is warranted.

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