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Structure and function of nonhistone phosphoproteins.

Many nonhistone nuclear proteins have been shown to be phosphorylated and associated with a diverse range of cellular activities. The aim of this present review is to update the most recent developments in this field with respect to the traditional roles that these proteins have been postulated to play as enzymes, DNA-binding proteins, hormonal receptors, nucleosome associated proteins, and nucleolar associated proteins. In addition, evidence is presented suggesting that these proteins may also function as nuclear oncogene protein products, structural constituents of nuclear organization (e.g., lamina-nuclear matrix associated proteins), and RNA processing factors.