Electron microscopic evidence for splicing of SV40 late mRNAs - PubMed (original) (raw)
Electron microscopic evidence for splicing of SV40 late mRNAs
S Bratosin et al. Cell. 1978 Apr.
Abstract
Poly(A)-containing SV40 cytoplasmic RNA was hybridized with linear double-stranded SV40 DNA and formed RNA displacement loops (R loops). The structures visualized in the electron microscope are consistent with the conclusion that the leader sequences at the 5' ends of the 16S and 19S late mRNAs are not coded immediately adjacent to the main portions of the mRNAs. These data are consistent with either segmentation of the leaders or heterogeneity of their lengths. Measurements carried out on the R loop structures have provided the locations, on the physical map of SV40 DNA, for the bodies and leaders of the 16S and 19S late mRNAs, and the lengths of the bodies, leaders and the corresponding intervening DNA sequences.
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