Shih T Y, Weeks M O, Young H A, Scolnick E M
J Virol. 1979 Aug;31(2):546-6. doi: 10.1128/JVI.31.2.546-546.1979.
We have recently described an intracellular protein, p21, in nonproducer cells transformed by either the Kirsten (Ki-MSV) or Harvey (Ha-MSV) strain of murine sarcoma virus (Shih et al., Virology, in press). The p21 is phosphorylated and has been shown to be coded for by either Ki-MSV or Ha-MSV. In this report, we compare the thermal stability of the newly synthesized [35S]methionine-labeled p21 in cells transformed by the wild-type Ki-MSV or by a mutant of Ki-MSV (ts 371) which is temperature sensitive in a viral function required for the maintenance of several properties of the transformed phenotype. The immunoprecipitability of the p21 coded for by the ts 371 Ki-MSV was markedly more thermolabile than the p21 of the wild-type Ki-MSV when the cell extracts are heated in vitro. The present finding suggests that the p21 is required for the maintenance of transformation induced by Ki-MSV.
我们最近在由 Kirsten(Ki-MSV)或 Harvey(Ha-MSV)株鼠肉瘤病毒转化的非生产性细胞中描述了一种细胞内蛋白 p21(Shih 等人,《病毒学》,即将发表)。p21 被磷酸化,并且已证明由 Ki-MSV 或 Ha-MSV 编码。在本报告中,我们比较了在由野生型 Ki-MSV 或 Ki-MSV 的突变体(ts 371)转化的细胞中,新合成的 [35S]甲硫氨酸标记的 p21 的热稳定性,该突变体在维持转化表型的几种特性所需的病毒功能中对温度敏感。当体外加热细胞提取物时,ts 371 Ki-MSV 编码的 p21 的免疫沉淀性明显比野生型 Ki-MSV 的 p21 更不耐热。目前的发现表明,p21 是维持 Ki-MSV 诱导的转化所必需的。