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. 1991 May 11;19(9):2261–2265. doi: 10.1093/nar/19.9.2261

Streptomycin inhibits splicing of group I introns by competition with the guanosine substrate.

U von Ahsen 1, R Schroeder 1
PMCID: PMC329428  PMID: 1710351

Abstract

Streptomycin is an aminocyclitol glycoside antibiotic, which interferes with prokaryotic protein synthesis by interacting with the ribosomal RNA. We report here that streptomycin is also able to inhibit self splicing of the group I intron of the thymidylate synthase gene of phage T4. The inhibition is kinetically competitive with the substrate guanosine. Streptomycin and guanosine have in common a guanidino group, which has been shown to undergo hydrogen bonds with the ribozyme (Bass & Cech, Biochemistry, 25, 1986, 4473). The inhibitory effect of streptomycin extends to other group I introns, but does not affect group II introns. Mutating the bulged nucleotide in the conserved P7 secondary structure element of the td intron alters the affinity of the ribozyme for both guanosine and streptomycin. Myomycin, an antibiotic with similar effects on protein synthesis as streptomycin, is also able to inhibit splicing. In contrast, bluensomycin, which is structurally related to streptomycin, but contains only one guanidino group does not inhibit splicing. We discuss these findings in support of an evolutionary model that stresses the antiquity of antibiotics (J. Davies, Molecular Microbiology 4, 1990, 1227).

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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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