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. 1996 Oct 15;24(20):3996–4002. doi: 10.1093/nar/24.20.3996

Effects of antisense DNA against the alpha-sarcin stem-loop structure of the ribosomal 23S rRNA.

H A Meyer 1, F Triana-Alonso 1, C M Spahn 1, T Twardowski 1, A Sobkiewicz 1, K H Nierhaus 1
PMCID: PMC146203  PMID: 8918803

Abstract

Antisense DNAs complementary against various sequences of the alpha-sarcin domain (C2646-G2674) of 23S rRNA from Escherichia coli were hybridized to naked 23S rRNA as well as to 70S ribosomes. Saturation levels of up to 0.4 per 70S ribosome were found, the identical fraction was susceptible to the attack of the RNase alpha-sarcin. The hybridization was specific as demonstrated with RNase H digestion, sequencing the resulting fragments and blockage of the action of alpha-sarcin. The RNase alpha-sarcin seems to approach its cleavage site from the 3' half of the loop of the alpha-sarcin domain. Hybridization is efficiently achieved at 37 degrees C and can extend at least into the 3' strand of the stem of the alpha-sarcin domain. However, the inhibition of alpha-sarcin activity is observed at 30 degrees C but not at 37 degrees C. For a significant inhibition of poly(Phe) synthesis the temperature had to be lowered to 25 degrees C. The results imply that the alpha-sarcin domain changes its conformation during protein synthesis and that the conformational changes may include a melting of the stem of the alpha-sarcin domain.

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Selected References

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