Self resistance to the atypical cationic antimicrobial peptide edeine of Brevibacillus brevis Vm4 by the N-acetyltransferase EdeQ.
Chem Biol
; 20(8): 983-90, 2013 Aug 22.
Article
em En
| MEDLINE
| ID: mdl-23891151
Edeines are atypical cationic peptides produced by Brevibacillus brevis Vm4 with broad-spectrum antimicrobial activity. These linear nonribosomal peptides bind to the 30S ribosomal subunit and block t-RNA binding to the P-site. To identify the mechanism of high-level self-resistance in the producing organism, the B. brevis Vm4 genome was sequenced and the edeine biosynthetic cluster discovered. A potential edeine-modifying enzyme, EdeQ, showed similarity to spermidine N-acetyltransferases. EdeQ was purified and shown to convert edeine to N-acetyledeine, which is inactive against cells in vivo and against cell-free extracts. Unexpectedly, tandem mass spectroscopy and nuclear magnetic resonance demonstrate that N-acylation occurs on the free amine of the internal diaminopropionic acid rather than the N-terminal spermidine polyamine. Acetylation of edeine by EdeQ abolishes its ability to inhibit translation, thus conferring resistance to the antibiotic in the producing organism.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Acetiltransferases
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Edeína
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Brevibacillus
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Antibacterianos
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article