Lavi S, Groner Y
Proc Natl Acad Sci U S A. 1977 Dec;74(12):5323-7. doi: 10.1073/pnas.74.12.5323.
The region of the simian virus 40 genome complementary to the 5' end of the most abundant poly(A)-containing 19S and 16S mRNAs was mapped by hybridization of double-labeled RNA ([3H]methyl group and [14C]uridine) to specific DNA fragments. Chemical identification of methylated residues indicated that a common "leader" sequence adjacent to the 5' terminus of both 19S and 16S mRNA is transcribed from DNA sequences located between 0.67 and 0.76 map units. The estimated size of this "leader" RNA, which does not code for any known viral protein, is 170-200 nucleotides. Our results indicate that sequences complementary to the "leader" region and coding portion of 16S mRNA are located in separate parts of the simian virus 40 genome.
通过将双标记RNA([3H]甲基基团和[14C]尿苷)与特定DNA片段杂交,绘制了与最丰富的含多聚腺苷酸的19S和16S mRNA的5'端互补的猴病毒40基因组区域。甲基化残基的化学鉴定表明,与19S和16S mRNA的5'末端相邻的共同“前导”序列是从位于0.67至0.76图距单位之间的DNA序列转录而来的。这种不编码任何已知病毒蛋白的“前导”RNA的估计大小为170 - 200个核苷酸。我们的结果表明,与“前导”区域和16S mRNA编码部分互补的序列位于猴病毒40基因组的不同部分。