A novel ERK-like, CRK-like protein kinase that modulates growth in Trypanosoma brucei via an autoregulatory C-terminal extension

Molecular Microbiology
James EllisKeith Matthews

Abstract

The protozoan parasite Trypanosoma brucei undergoes a complex developmental cycle coordinated with cell cycle control. These processes in eukaryotes are frequently regulated through mitogen-activated protein kinases (MAPKs) and cyclin-dependent protein kinases (CDKs), respectively. We have discovered a novel protein kinase which shares features of both ERK-type MAPKs and CDKs (T. brucei ERK-like, CDK-like protein kinase). This molecule, named TbECK1, is similar to the unusual mammalian KKIAMRE protein kinase family. Moreover, TbECK1 possesses a long C-terminal extension reminiscent of those found in mammalian ERK5, ERK7 and ERK8. Expression analyses demonstrate that TbECK1 is constitutively expressed during the trypanosome life cycle at both RNA and protein level. In transgenic parasites we demonstrate that expression of a mutant of TbECK1 that lacks the C-terminal extension produces a slow growth phenotype, associated with the appearance of cells with aberrant karyotypes. Using this as an assay we further demonstrate that the phenotype is dependent upon the potential for catalytic activity of TbECK1 and on the integrity of at least one of the phosphorylable amino acids in its phosphorylation lip. C-terminal extensions are a co...Continue Reading

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Citations

Dec 15, 2011·The Journal of Biological Chemistry·Chao-Cheng ChoChin-Hung Sun
Apr 7, 2009·Molecular & Cellular Proteomics : MCP·Isabelle R E NettMichael A J Ferguson
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Sep 5, 2009·Molecular and Biochemical Parasitology·Sarah KabaniKeith R Matthews
Jun 6, 2007·International Journal for Parasitology·Martin Wiese

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