Nucleic Acids Research, 1986, Vol. 14, No. 14 5605-5614
© 1986
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The common 5' terminal sequence on trypanosome mRNAs: a target for anti-messenger oligodeoxynucleotides
Division of Molecular Biology, The Netherlands Cancer Institute (Antoni van Leeuwenhoek-Huis) Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands 1Laboratoire de Biophysique, INSERM U201, CNRS ERA 481, Muséeum Nationale d'Histoire Naturelle 61 Rue Buffon, F 75005 Paris, France
Received May 30, 1986. Accepted June 26, 1986.
Several mature mRNAs of Trypanosoma brucel were previously shown to have a common 5' terminal sequence of 35 nucleotldes (nt) encoded by a separate mini-exon. To verify whether all trypanosome mRNAs contain this mini-exon sequence at their 5' end, we have tested oligodeoxynucleotides complementary to different parts of the 35 nt leader sequence for their ability to inhibit translation of total trypanosome mRNA. All ollgomers tested inhibited translation of trypanosome mRNAs in a wheat germ extract. They had no effect on translation of Brome mosaic virus mRNA and of a trypanosome mRNA for phos-phoglycerate kinase modified to remove the mini-exon sequence. Three different 12mers inhibited translation 3560%; both the 22- and 34mer inhibited translation 95100%. Incorporation of amino acids decreased proportionally in all protein bands detected in high resolution polyacrylamide gels. Our results show that all trypanosome mRNAs that yield a product detectable in gel contain a mini-exon sequence. He infer that most, if not all, trypanosome mRNAs contain a 5' terminal mini-exon sequence ac' quired by discontinuous synthesis.
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