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Multiple protein kinases from Trypanosoma gambiense.

R D Walter

    Hoppe-Seyler'S Zeitschrift Fur Physiologische Chemie
    |May 1, 1978
    PubMed
    Summary

    Three protein kinases were identified in Trypanosoma gambiense, phosphorylating serine and threonine residues. Their activities were influenced by nucleotides and nucleosides, but not cyclic nucleotides.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Parasitology

    Background:

    • Trypanosoma gambiense is a protozoan parasite responsible for human African trypanosomiasis.
    • Protein kinases play crucial roles in cellular signaling pathways.
    • Understanding parasitic protein kinases is vital for developing targeted therapies.

    Purpose of the Study:

    • To characterize the protein kinase activities present in Trypanosoma gambiense.
    • To identify the preferred substrates and phosphorylated residues.
    • To investigate the effects of cyclic nucleotides, nucleotides, and nucleosides on enzyme activity.

    Main Methods:

    • Fractionation of Trypanosoma gambiense extract.
    • Assay of protein kinase activity using various acceptor proteins (phosvitin, histone, protamine).
    • Determination of phosphorylated amino acid residues (serine, threonine).
    • Analysis of molecular weights via gel filtration or similar techniques.
    • Testing the effects of cyclic nucleotides, cyclic AMP receptors, nucleotides, and nucleosides.

    Main Results:

    • Three distinct protein kinase activities were identified.
    • The enzymes showed preference for phosvitin, histone, and protamine.
    • Serine and threonine residues were phosphorylated.
    • Enzyme activities were unaffected by cyclic nucleotides or cyclic AMP receptors.
    • Molecular weights were determined to be >200,000, 95,000, and 37,000 Da.
    • Nucleotides and nucleosides modulated enzyme activities to varying degrees.

    Conclusions:

    • Trypanosoma gambiense possesses multiple protein kinases with distinct substrate specificities.
    • These kinases phosphorylate serine and threonine residues.
    • Their activity regulation differs from host cell kinases, being sensitive to nucleotides/nucleosides but not cyclic nucleotides.
    • The characterized protein kinases represent potential targets for antiparasitic drug development.

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