Phosphorylation of RCC1 in Mitosis is Essential for Producing a High RanGTP Concentration on Chromosomes and for Spindle Assembly in Mammalian Cells

Overview

Journal Genes Dev

Specialty Molecular Biology

Date 2004 Mar 12

PMID 15014043

Citations 63

Authors

Hoi-Yeung Li

Yixian Zheng

Affiliations

Soon will be listed here.

Abstract

Spindle assembly is subject to the regulatory controls of both the cell-cycle machinery and the Ran-signaling pathway. An important question is how the two regulatory pathways communicate with each other to achieve coordinated regulation in mitosis. We show here that Cdc2 kinase phosphorylates the serines located in or near the nuclear localization signal (NLS) of human RCC1, the nucleotide exchange factor for Ran. This phosphorylation is necessary for RCC1 to generate RanGTP on mitotic chromosomes in mammalian cells, which in turn is required for spindle assembly and chromosome segregation. Moreover, phosphorylation of the NLS of RCC1 is required to prevent the binding of importin alpha and beta to RCC1, thereby allowing RCC1 to couple RanGTP production to chromosome binding. These findings reveal that the cell-cycle machinery directly regulates the Ran-signaling pathway by placing a high RanGTP concentration on the mitotic chromosome in mammalian cells.

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