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Regulation of peroxiredoxin I activity by Cdc2-mediated phosphorylation

Title
Regulation of peroxiredoxin I activity by Cdc2-mediated phosphorylation
Authors
Chang T.-S.Jeong W.Choi S.Y.Yu S.Kang S.W.Rhee S.G.
Ewha Authors
강상원정우진창동신
SCOPUS Author ID
강상원scopus; 정우진scopus; 창동신scopus
Issue Date
2002
Journal Title
Journal of Biological Chemistry
ISSN
0021-9258JCR Link
Citation
vol. 277, no. 28, pp. 25370 - 25376
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Hydrogen peroxide is implicated as an intracellular messenger in various cellular responses such as proliferation and differentiation. Peroxiredoxin (Prx) I is a member of the peroxiredoxin family of peroxidases and contains a consensus site (Thr90-Pro-Lys-Lys) for phosphorylation by cyclin-dependent kinases (CDKs). This protein has now been shown to be phosphorylated specifically on Thr90 by several CDKs, including Cdc2, in vitro. Phosphorylation of Prx I on Thr90 reduced the peroxidase activity of this protein by 80%. The phosphorylation of Prx I in HeLa cells was monitored with the use of antibodies specific for Prx I phosphorylated on Thr90. Immunoblot analysis with these antibodies of HeLa cells arrested at various stages of the cell cycle revealed that Prx I phosphorylation occurs in parallel with the activation of Cdc2; Prx I phosphorylation was thus marked during mitosis but virtually undetectable during interphase. Furthermore, when Cdc2 expression was reduced by RNA interference with cognate small interfering RNAs, Prx I phosphorylation was not observed in the cells synchronized in mitotic phase. The cytosolic location of Prx I likely prevents its interaction with activated CDKs until after the breakdown of the nuclear envelope during mitosis, when Cdc2 is the CDK that is most active. Phosphorylation of Prx I on Thr90 both in vitro and in vivo was blocked by roscovitine, an inhibitor of CDKs. These results suggest that Cdc2-mediated phosphorylation and inactivation of Prx I and the resulting intracellular accumulation of H2O2 might be important for progression of the cell cycle.
DOI
10.1074/jbc.M110432200
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자연과학대학 > 생명과학전공 > Journal papers
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