Abstract
Precursor mRNAs were synthesized in vitro from a plasmid in which the early region 2 gene of adenovirus 2 is fused to an efficient bacteriophage promoter (Salmonella phage 6). The RNAs were purified and used as substrates for in vitro splicing in the presence of nuclear extracts prepared from MOPC-315 mouse myeloma cells. The in vitro splicing was accurate at the nucleotide level. The reaction occurs rapidly and without any detectable lag. The concentration of the pre-mRNA precursor during incubation appears to be an important factor for high efficiency (60%-80%) of in vitro RNA splicing. Fractionation of the splicing components as well as modifications of the DNA template to study the nucleotide-sequence requirement for in vitro splicing can now be accomplished with this system.
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