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Volume 270, Number 18, Issue of May 5, pp. 10658-10663, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.

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Hisato Saitoh , Mary Dasso

RCC1 is an abundant, highly conserved, chromatin-associated protein whose function is necessary for the preservation of a properly ordered cell cycle. RCC1 is also necessary for numerous nuclear processes, including nuclear transport and RNA metabolism; and it functions enzymatically as a guanine nucleotide exchange factor for a small, ras-related GTPase called Ran. Studies in several organisms suggest that RCC1 may be part of a large complex containing multiple proteins. There is also evidence that RCC1 associates with chromatin through other proteins and that the binding of the complex to chromatin varies within the cell cycle. In order to characterize this putative complex, we have identified a number of other proteins as candidate components of the complex by their association with a GST-RCC1 fusion protein. Three of these proteins have previously been identified (Ran, RanBP1, and hsc70). The fourth protein is novel and has a molecular mass of 340 kDa. In this report, we discuss a preliminary characterization of the interactions between these proteins.

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