植物ウイルスの感染と増殖に関する研究IV : CMV感染による細胞RNA合成の抑制

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タイトル別名
  • Studies on the Infection and the Multiplication of Plant Viruses
  • 植物ウイルスの感染と増殖に関する研究
  • ショクブツ ウイルス ノ カンセン ト ゾウショク ニ カンスル ケンキュウ 4 CMV カンセン ニ ヨル サイボウ RNA ゴウセイ ノ ヨクセイ エイブン
  • IV. Suppression of cellular RNA synthesis by the cucumber mosaic virus-infection
  • IV. CMV感染による細胞RNA合成の抑制

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抄録

1) The cellular RNA content was altered by CMV infection. The amount of RNA in the infected cells decreased during the first 24hr after infection, and thereafter increased gradually. It is conceivable that the reduction in RNA content in the early stage of infection resulted from the suppression of cellular RNA synthesis, and that the increase in RNA in the later stage was due to the increase of viral RNA in the cells.<br>2) Base composition and buoyant density of DNA were not significantly altered by infection. The suppression of cellular RNA synthesis by CMV seems not to be caused by a compositional change of DNA.<br>3) The rate of histone synthesis changed concurrently with the changes in the rate of DNA synthesis. The change in histone synthesis was not only quantitative but also qualitative; the fractionation of histone revealed a preferential increase in arginine-rich histone fraction.<br>4) RNA synthesis in isolated calf thymus nuclei was suppressed by the addition of tobacco histone. This inhibitory effect was greater in histone from infected cells than in that from normal cells.<br>5) These results suggest that the suppression of cellular RNA synthesis by infection is due to the compositional change of histone.

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