title: Cellular proliferation and hypusine synthesis.
abstract: Hypusine (N(-)-(4-amino-2-hydroxybutyl) lysine), a spermidine-dependent post-translational protein modification, is synthesized by various mammalian cells in culture. Experiments described in this paper demonstrated a relationship between rates of cellular growth and the synthesis of hypusine. Cells that divide at fast rates have a high rate of hypusine synthesis. In kinetic experiments, a positive relationship is evident between the rates of protein, DNA and hypusine synthesis. Cells seeded at high density, growing non-exponentially, synthesized less hypusine than logarithmically growing cells seeded at low density. Slowing the growth rate of cells by modification of the external milieu also results in a decreased rate of hypusine synthesis. These results provide additional evidence of the association of hypusine with cell proliferation in cultured cell lines and suggest a possible role for this unusual post-translational modification in the complex macromolecular events leading to cellular growth.
mesh_terms: D000818:Animals; D002455:Cell Division; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D003470:Culture Media; D004247:DNA / Q000096:biosynthesis; D005260:Female; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008239:Lysine / Q000031:analogs & derivatives* / Q000096:biosynthesis; D010053:Ovary; D011073:Polyamines / Q000378:metabolism*; D014176:Protein Biosynthesis; D011700:Putrescine / Q000378:metabolism; D013095:Spermidine / Q000378:metabolism; D013096:Spermine / Q000378:metabolism
chemical_list: D003470:Culture Media; D011073:Polyamines; D013096:Spermine; C100028:hypusine; D004247:DNA; D008239:Lysine; D013095:Spermidine; D011700:Putrescine