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철 스트레스( 2μM 이하 농도) 하에서 시데로포어를 생산하는 균주를 토양에서 분리하여 16S rDNA 염기 서열 분석과 생화학적, 생리학적 분석 및 전자 현미경 관찰 등으로 동정한 결과, Acinetobacter sp.로 밝혀졌다. 시데로포어의 카테콜 특성은 Arnow법으로 조사되었다. 철을 제한한 배지에서 균주를 배양한 결과, 36∘C 에서도 잘 자랐지만 시데로포어 생산은 28∘C 에서 높았다. 36∘C 에서는 시데로포어 생산이 강하게 억제되었다. 10μM\;FeCl₃ 를 첨가한 배지에서는 시데로포어 생산이 완전히 억제되었다. 균주 상등액을 부탄올 추출 후, Sephadex LH-20 컬럼 크로마토그래피와 HPLC를 이용하여 시데로포어를 분리, 정제하였다. 분리, 정제된 시데로포어의 구조는 HPLC, TLC와 IR 분석 결과로부터 2,3-dihydroxybenzoic acid로 확인되었다. A soil microorganism producing iron chelator (siderophore) under low iron stress (up to 2μM of iron) was identified as Acinetobacter sp. B-W by 16S rDNA sequence analysis, biochemical-, physiological tests and morphological analysis using electron microscope. Catechol nature of siderophore was detected by Arnow test. Although optimal cell growth was identified at 36∘C in iron-limited media, significant quantities of siderophore were produced only at 28∘C . Biosynthesis of siderophore was strongly inhibited by growth at 36∘C . Production of siderophore was completely inhibited by 10μM\;FeCl₃ . Iron chelator produced from Acinetobacter sp. B-W was purified from supernatant using butanol extraction, Sephadex LH-20 column chromatography and HPLC. Purified sideropore was identified as 2,3-dihydroxybenzoic acid by HPLC, TLC and IR analysis.
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Kim et al. (2015) studied this question.
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