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홍조류로부터 신규 한천분해미생물 Alteromonas macleodii subsp. GNUM08120의 분리 및 동정
지원재 ( Won Jae Chi ),임주현 ( Ju Hyeon Lim ),박다연 ( Da Yeon Park ),김무찬 ( Mu Chan Kim ),김창준 ( Chang Joon Kim ),장용근 ( Yong Keun Chang ),홍순광 ( Soon Kwang Hong ) 한국미생물생명공학회(구 한국산업미생물학회) 2013 한국미생물·생명공학회지 Vol.41 No.1
An agar-hydrolyzing marine bacterium, strain GNUM08120, was isolated from Sargassum fulvellum collected from Yeongil bay of East Sea of Korea. The isolate was Gram-negative, aerobic, motile with single polar flagellum, and grew at 1-10% NaCl, pH 5.0-8.0, and 15-37oC. G+C content and the predominant respiratory quinone were 46.13 mol% and Q-8, respectively. The major cellular fatty acids were Summed feature 3 (24.5%), C16:0 (21.7%), and C18:1ω7c (12.5%). Based on 16S rRNA gene sequence similarity and DNA-DNA hybridization analyses, strain GNUM08120 was identified as a novel subspecies of Alteromonas macleodii, designated Alteromonas macleodii subsp. GNUM08120. Production of agarase by strain GNUM08120 was likely repressed by the effect of carbon catabolite repression caused by glucose. The crude agarase prepared from 12 h culture broth of strain GNUM08120 exhibited an optimum pH and temperature for agarase activity at 7.0 and 40oC, respectively. The crude enzyme produced (neo)agarobiose, (neo)agarotetraose, and (neo)agarohexaose as the hydrolyzed product of agarose.