中国科技论文在线 http://www.paper.edu.cn J. Ocean Univ. China (Oceanic and Coastal Sea Research) DOI 10.1007/s11802-012-1929-3 ISSN 1672-5182, 2012 11 (3): 375-382 http://www.ouc.edu.cn/xbywb/ E-mail:
[email protected] A Polysaccharide-Degrading Marine Bacterium Flammeovirga sp. MY04 and Its Extracellular Agarase System HAN Wenjun1), 2), 3), GU Jingyan1), 3), YAN Qiujie2), LI Jungang2), WU Zhihong3), *, GU Qianqun1), *, and LI Yuezhong3) 1) Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, P. R . C hi n a 2) School of Life Science and Biotechnology, Mianyang Normal University, Mianyang 621000, P. R. China 3) State Key Laboratory of Microbial Technology, School of Life Science, Shandong University, Jinan 250100, P. R. China (Received February 2, 2012; revised April 8, 2012; accepted May 29, 2012) © Ocean University of China, Science Press and Springer-Verlag Berlin Heidelberg 2012 Abstract Bacteria of the genus Flammeovirga can digest complex polysaccharides (CPs), but no details have been reported re- garding the CP depolymerases of these bacteria. MY04, an agarolytic marine bacterium isolated from coastal sediments, has been identified as a new member of the genus Flammeovirga. The MY04 strain is able to utilize multiple CPs as a sole carbon source and -1 -1 grows well on agarose, mannan, or xylan. This strain produces high concentrations of extracellular proteins (490 mg L ± 18.2 mg L liquid culture) that exhibit efficient and extensive degradation activities on various polysaccharides, especially agarose. These pro- -1 -1 teins have an activity of 310 U mg ± 9.6 U mg proteins.