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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 
 

Synthesis of high mobility group proteins in regenerating rat liver.

Incorporation of [3H]lysine into the non-histone chromosomal proteins HMG1, HMG2, and HMG17 and into each of the five major classes of histones was measured in rat liver at various times after partial hepatectomy. Histone synthesis was closely coupled temporally to that of DNA, although a small amount of histone was shown to be produced before DNA replication began. In contrast, the incorporation curves for the high mobility group (HMG) proteins showed little correlation with that for DNA. At 4 h after partial hepatectomy, protein synthesis had virtually ceased. Thereafter, the rates of synthesis of the HMG proteins rose steadily so that by 12 h, well before the onset of DNA replication they had reached about two-thirds of the maximum rates attained during the first cell division cycle. Histones had only reached about one-sixth of their maximum rates at this time. The lack of coupling betweeen the synthesis of the HMG proteins and DNA was confirmed by experiments with inhibitors of DNA replication. Reduction of DNA synthesis to less than 10% of the uninhibited rate had little or no effect on incorporation into the HMG proteins, whereas, under similar conditions, the rate of synthesis of histones was reduced by more than 50%.[1]

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