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. 1980 Jul;77(7):3908–3911. doi: 10.1073/pnas.77.7.3908

Isolation and sequence determination of 5'-terminal oligonucleotide fragments of RNA transcripts synthesized by bacteriophage T3-induced RNA polymerase from T3 DNA.

U Maitra, W Jelinek, A Yudelevich, H K Majumder, A Guha
PMCID: PMC349736  PMID: 6933443

Abstract

The nucleotide sequence of the 5'-terminal oligonucleotides produced by pancreatic RNase digestion of bacteriophage T3 RNA polymerase (EC 2.7.7.6) transcripts of T3 DNA has been determined. The sequence determination is based upon a simple isolation procedure for the 5'-terminal oligonucleotides. This procedure involves treatment of pancreatic RNase digests of alpha 32P-labeled T3 RNA polymerase transcripts with bovine brain exoribonuclease to remove oligonucleotides with free 5'-hydroxyl termini and then chromatographing the products on hydroxylapatite to resolve the remaining oligonucleotides having 5'-phosphate termini. By application of standard two-dimensional separation and sequence techniques, the major 5'-end sequences deduced were pppGpGpGpApGpApGpApY(Y = pyrimidine nucleoside) and pppGpGpGpApGpApCp. In addition, the sequences of other minor 5'-terminal oligonucleotides observed on homochromatograms were also determined. The sequences of these 5'-oligonucleotides were pppGpGpGpApApCpY, pppGpGpGpApApUpY, pppGpGp(2-4 Gp, 2-3 ApGp)..., and pppGpGpGp.... These results demonstrate that T3 phage-induced RNA polymerase possesses a high degree of specificity in the initiation of RNA chains.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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