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The serine/threonine kinase Pim-1

Malte Bachmann1, Tarik Möröy

  • 1Institut für Zellbiologie (Tumorforschung), Universitaetsklinikum Essen, IFZ, Virchowstrasse 173, D-45122 Essen, Germany.

The International Journal of Biochemistry & Cell Biology
|February 8, 2005
PubMed

Insights

The human pim-1 gene produces two serine/threonine kinase proteins, essential for cell cycle and apoptosis. Pim-1 acts as an immune response booster, induced by cytokines.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Immunology

Background:

  • The human pim-1 gene encodes a serine/threonine kinase, part of the calcium/calmodulin-regulated kinase (CAMK) family.
  • Pim-1 possesses a kinase domain, ATP anchor, and active site, crucial for its enzymatic activity.
  • Two Pim-1 protein isoforms (44 kD and 34 kD) are produced from the same gene via alternative initiation codons.

Purpose of the Study:

  • To elucidate the structure and function of the human pim-1 gene and its encoded proteins.
  • To investigate the expression patterns and cellular localization of Pim-1.
  • To understand the role of Pim-1 in cellular processes like cell cycle progression and apoptosis, and its impact on immune responses.

Main Methods:

  • Gene expression analysis to determine Pim-1 localization across various human tissues.
  • Protein characterization to identify different Pim-1 isoforms and their domains.
  • Functional assays to assess Pim-1's kinase activity and substrate phosphorylation.
  • Stimulation studies using cytokines to evaluate Pim-1's response and effect on immune cells.

Main Results:

  • Pim-1 expression is observed in diverse tissues, including hematopoietic, lymphoid, prostate, testis, and oral epithelial cells.
  • Pim-1 phosphorylates various targets involved in cell cycle control and apoptosis.
  • Cytokine-induced expression of Pim-1 enhances immune system responses, earning it the moniker 'booster'.

Conclusions:

  • The pim-1 gene encodes functionally significant serine/threonine kinase proteins with broad expression patterns.
  • Pim-1 plays a critical role in regulating cell cycle, apoptosis, and immune function.
  • Pim-1's ability to enhance immune responses highlights its potential therapeutic relevance in immune modulation.

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