期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 288, 期 5, 页码 1207-1211出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/bbrc.2001.5920
关键词
Pfmrk; PfPK5; PfPK6; cyclin dependent protein kinase; Plasmodium falciparum; p21; p16; inhibition; cell cycle
The regulatory mechanisms of most cyclin dependent protein kinases (CDKs) are well understood and are highly conserved in eukaryotes. CDKs from the malaria parasite, Plasmodium falciparum, appear to be regulated in a similar manner with regard to cyclin binding and phosphorylation. In order to further understand their regulatory mechanisms, we examined two classes of cyclin dependent kinase inhibitors (CDIs) to inhibit a panel of plasmodial CDKs. We find that Pfmrk and PfPK5 are inhibited by heterologous p21(CIP1) with varying degrees of inhibition. In contrast, PfPK6, a kinase with sequence features characteristic of both a CDK and MAP kinase, is unaffected by this CDI. Furthermore, the CDK4/6 specific CDI, p16(INK4), fails to inhibit these plasmodial CDKs. Taken together, these results suggest that plasmodial CDKs may be regulated by the binding of inhibitory proteins in vivo. (C) 2001 Academic Press.
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