Molecular cloning and characterization of mitogen-activated protein kinase 2 in Toxoplasma gondii

Huan Huang, Yan Fen Ma, Yi Bao, Hattie Lee, Michael P. Lisanti, Herbert B. Tanowitz, Louis M. Weiss

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Mitogen-activated protein kinase (MAPK) pathways are major signal transduction systems by which eukaryotic cells convert environmental cues to intracellular events, such as cell proliferation and differentiation. Toxoplasma gondii is an obligate intracellular protozoan that is both a human and animal pathogen. This Apicomplexan causes significant morbidity and mortality in immune-competent and immune-compromised hosts. In humans, the most common manifestations of T. gondii infections are chorioretinitis in congenital infection and encephalitis in immune-compromised patients, such as patients with advanced AIDS. We have identified a T. gondii homolog of the MAPK family that we have called TgMAPK2. Sequence analyses demonstrated that TgMAPK2 has homology with lower eukaryotic ER K2, but has significant differences from mammalian ER K2. TgMAPK2 has an open reading frame of 2,037 bp, 678 amino acids, and its molecular weight is 73.1 kDa. It contains the typical 12 subdomains of a MAPK and has a TDY motif in the dual phosphorylation and activation subdomains. This suggests that TgMAPK2 may play an important role in stress response. Recombinant TgMAPK2 was catalytically active and was not inhibited by a human ER K2 inhibitor, FR180204. A partial TgMAPK2 lacking the ATP binding motifs, GxGxxGxV, was successfully regulated by a ligand-controlled destabilization domain (ddFKBP) expression vector system in T. gondii. Since TgMAPK2 is significantly different from its mammalian counterpart, it may be useful as a drug target. This work establishes a foundation for further study for this unique kinase.

Original languageEnglish (US)
Pages (from-to)3519-3526
Number of pages8
JournalCell Cycle
Volume10
Issue number20
DOIs
StatePublished - Oct 31 2011

Fingerprint

Mitogen-Activated Protein Kinase 1
Toxoplasma
Molecular Cloning
Mitogen-Activated Protein Kinases
Chorioretinitis
Toxoplasmosis
Eukaryotic Cells
Open Reading Frames
Cues
Sequence Analysis
Cell Differentiation
Signal Transduction
Acquired Immunodeficiency Syndrome
Phosphotransferases
Adenosine Triphosphate
Molecular Weight
Phosphorylation
Cell Proliferation
Ligands
Morbidity

Keywords

  • DdFKBP
  • Differentiation
  • Mitogen-activated protein kinase
  • Phosphorylation
  • Protozoa
  • Signal transduction
  • Toxoplasma gondii

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Cite this

Molecular cloning and characterization of mitogen-activated protein kinase 2 in Toxoplasma gondii. / Huang, Huan; Ma, Yan Fen; Bao, Yi; Lee, Hattie; Lisanti, Michael P.; Tanowitz, Herbert B.; Weiss, Louis M.

In: Cell Cycle, Vol. 10, No. 20, 31.10.2011, p. 3519-3526.

Research output: Contribution to journalArticle

Huang, Huan ; Ma, Yan Fen ; Bao, Yi ; Lee, Hattie ; Lisanti, Michael P. ; Tanowitz, Herbert B. ; Weiss, Louis M. / Molecular cloning and characterization of mitogen-activated protein kinase 2 in Toxoplasma gondii. In: Cell Cycle. 2011 ; Vol. 10, No. 20. pp. 3519-3526.
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