Human cyclin F (original) (raw)

Abstract

Cyclins are important regulators of cell cycle transitions through their ability to bind and activate cyclin-dependent protein kinases. In mammals several classes of cyclins exist which are thought to co-ordinate the timing of different events necessary for cell cycle progression. Here we describe the identification of a novel human cyclin, cyclin F, isolated as a suppressor of the G1/S deficiency of a Saccharomyces cerevisiae cdc4 mutant. Cyclin F is the largest cyclin, with a molecular weight of 87 kDa, and migrates as a 100-110 kDa protein. It contains an extensive PEST-rich C-terminus and a cyclin box region that is most closely related to cyclins A and B. Cyclin F mRNA is ubiquitiously expressed in human tissues. It fluctuates dramatically through the cell cycle, peaking in G2 like cyclin A and decreasing prior to decline of cyclin B mRNA. Cyclin F protein accumulates in interphase and is destroyed at mitosis at a time distinct from cyclin B. Cyclin F shows regulated subcellular localization, being localized in the nucleus in most cells, with a significant percentage of cells displaying only perinuclear staining. Overexpression of cyclin F, or a mutant lacking the PEST region, in human cells resulted in a significant increase in the G2 population, implicating cyclin F in the regulation of cell cycle transitions. The ubiquitous expression and phylogentic conservation of cyclin F suggests that it is likely to coordinate essential cell cycle events distinct from those regulated by other cyclins.

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Selected References

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