[No authors listed]
DNA synthesis of human hepatoblastoma HepG2 cells is reversibly inhibited by butyrate. When butyrate is removed from the culture medium, cells re-enter the cell cycle, synthesizing DNA with a time lag of about 12 h. HepG2 cells, growth-inhibited for 30 h with butyrate, synthesize and accumulate a nuclear protein, called D. Protein D synthesis is inhibited in cells which, released from the butyrate block, have resumed DNA synthesis as well as in growing cells never exposed to butyrate. Protein D has been purified from growth-arrested cells and partially sequenced. The amino acid sequences of five internal trypsin peptides indicate that protein D is a novel nuclear protein.
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