3-methylarginine from Pseudomonas syringae pv. syringae 22d/93 suppresses the bacterial blight caused by its close relative Pseudomonas syringae pv. glycinea

被引:15
作者
Braun, Sascha D. [1 ]
Voelksch, Beate [1 ]
Nueske, Joerg [2 ]
Spiteller, Dieter [3 ]
机构
[1] Univ Jena, Inst Mikrobiol Mikrobielle Phytopathol, D-07743 Jena, Germany
[2] Univ Jena, Lehrstuhl Angew & Okol Mikrobiol, Inst Mikrobiol, D-07743 Jena, Germany
[3] Max Planck Inst Chem Ecol, D-07745 Jena, Germany
关键词
biosynthesis; methylarginine; methyltransferase; natural products; Pseudomonas syringae;
D O I
10.1002/cbic.200800080
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The epiphyte Pseudomonas syringae pv. syringae 22d/93 (Pss22d) produces a toxin that strongly inhibits the growth of its relative the plant pathogen P. syringae pv. glycinea. The inhition can be overcome by supplementing the growth medium with the essential amino acid, L. arginine; this suggests that the toxin acts as an inhibitor of the arginine biosynthesis. The highly polar toxin was purified by bioassay guided fractionation using ion-exhange chromatography and subsequent RP HPLC fractionation. The structure of the natural product was identified by HR-ESI MS, HR-ESI MS/MS, and NMR spectroscopy experiments as 3-methylarginine. This amino acid has previously only been known in nature as a constituent of the peptide lavendomycin from Streptomyces lavendulae. Results of experiments in which labeled methionine was fed to Pss22d indicated that the key step in the biosynthesis of 3 methylarginine is the introduction of the methyl group by a W-adenosylmethionine (SAM) dependent methyltransferase. Transposon mutagenesis of Pss22d allowed the responsible SAM dependent methyltransferase of the 3 methylariginine biosynthesis to be identified.
引用
收藏
页码:1913 / 1920
页数:8
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