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J Bacteriol. 1994 November; 176(22): 6992-6998

research-article

23S rRNA domain V, a fragment that can be specifically methylated in vitro by the ErmSF (TlrA) methyltransferase.

Department of Pharmacology, University of Wisconsin Medical School, Madison 53706.

ABSTRACT

The DNA sequence that encodes 23S rRNA domain V of Bacillus subtilis, nucleotides 2036 to 2672 (C. J. Green, G. C. Stewart, M. A. Hollis, B. S. Vold, and K. F. Bott, Gene 37:261-266, 1985), was cloned and used as a template from which to transcribe defined domain V RNA in vitro. The RNA transcripts served as a substrate in vitro for specific methylation of B. subtilis adenine 2085 (adenine 2058 in Escherichia coli 23S rRNA) by the ErmSF methyltransferase, an enzyme that confers resistance to the macrolide-lincosamide-streptogramin B group of antibiotics on Streptomyces fradiae NRRL 2702, the host from which it was cloned. Thus, neither RNA sequences belonging to domains other than V nor the association of 23S rRNA with ribosomal proteins is needed for the specific methylation of adenine that confers resistance to the macrolide-lincosamide-streptogramin B group of antibiotics.

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