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. 1999 Apr;5(4):585–595. doi: 10.1017/s135583829998202x

UV-induced modifications in the peptidyl transferase loop of 23S rRNA dependent on binding of the streptogramin B antibiotic, pristinamycin IA.

B T Porse 1, S V Kirillov 1, M J Awayez 1, R A Garrett 1
PMCID: PMC1369784  PMID: 10199574

Abstract

The naturally occurring streptogramin B antibiotic, pristinamycin IA, which inhibits peptide elongation, can produce two modifications in 23S rRNA when bound to the Escherichia coli 70S ribosome and irradiated at 365 nm. Both drug-induced effects map to highly conserved nucleotides within the functionally important peptidyl transferase loop of 23S rRNA at positions m2A2503/psi2504 and G2061/A2062. The modification yields are influenced strongly, and differentially, by P-site-bound tRNA and strongly by some of the peptidyl transferase antibiotics tested, with chloramphenicol producing a shift in the latter modification to A2062/C2063. Pristinamycin IA can also produce a modification on binding to deproteinized, mature 23S rRNA, at position U2500/C2501. The same modification occurs on an approximately 37-nt fragment, encompassing positions approximately 2496-2532 of the peptidyl transferase loop that was excised from the mature rRNA using RNAse H. In contrast, no antibiotic-induced effects were observed on in vitro T7 transcripts of full-length 23S rRNA, domain V, or on a fragment extending from positions approximately 2496-2566, which indicates that one or more posttranscriptional modifications within the sequence Cm-C-U-C-G-m2A-psi-G2505 are important for pristinamycin IA binding and/or the antibiotic-dependent modification of 23S rRNA.

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Selected References

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