Structural Identification of $Siderophore_{AH18}$ from Bacillus subtilis AH18, a Biocontrol agent of Phytophthora Blight Disease in Red-pepper

Bacillus subtilis AH18의 고추역병 방제능과 $Siderophore_{AH18}$의 구조분석

  • Woo, Sang-Min (Department of Applied Microbiology, Yeungnam University) ;
  • Kim, Sang-Dal (Department of Applied Microbiology, Yeungnam University)
  • 우상민 (영남대학교 응용미생물학과) ;
  • 김상달 (영남대학교 응용미생물학과)
  • Published : 2008.12.28

Abstract

The siderophore ($siderophore_{AH18}$) of Bacillus subtilis AR18 was determined to be one of catechol type and purified by using Amberlite XAD-2, Sephadex LR-20 chromatography, and reversed-phase RPLC. The $Siderophore_{AH18}$ was identified bacillibactin with its structure by GC-MS, $^1H$-NMR, and $^{13}C$-NMR. $Siderophore_{AH18}$ (bacillibactin) had been confirmed its molecular weight of 883 and chemical structure of $(2,3-dihydroxybenzoate-glycine-threonine)_3$. Purified $siderophore_{AH18}$ showed strong biocontrol ability towards the spore of Phytophthora capsici on PDA and able to effectively suppress (55%) P. capsici causing red-pepper blight in the pot in vivo test.

Bacillus subtilis AH18균주는 auxin, siderophore 그리고 cellulase를 동시에 생산하는 PGPR 균주이자 생물방제균주로 항진균성 siderophore의 특성을 확인한 결과 catechol type의 siderophore로 확인하였다. $Siderophore_{AH18}$ 의 정제는 Amberlite XAD-2, sephadex LH-20 column chromatography 그리고 HPLC를 통해 정제 및 정제여부를 확인하였으며, GC-MS, $^1H$-NMR, 그리고 $^{13}C$-NMR을 통해 구조 및 분자량을 확인하였다. 그 결과 B. subtilis AH18이 생산하는 siderophore은 분자량 883의 bacillibactin임을 확인하였으며, 포자발아억제활성을 나타냄을 확인하였다. B. subtilis AH18은 P. capsici에 의한 고추역병을 효과적으로 방제하였으며(방제력 55%), 이는 bacillibactin에 의한 효과가 포함되리라 추측된다.

Keywords

References

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