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Surface Microstructure and Component Changes of Chromium-resistant Enterobacter Cloacae CYS-25 Strain

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【Author】 MA Xiao-Yan a, b③ CHENG Yang-Jian a③ ZHENG Jing c YANG Chun-Peng a LI Bin a, b LI Dong-Song a, b LIN Zhang a② HUANG Feng a a (State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, China) b (Graduate School of the Chinese Academy of Sciences, Beijing 100039, China) c (Fuzhu Entry-exit Inspection and Quarantine Bureau, Fuzhou, Fujian 350001, China)

【机构】 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences； State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences； Fuzhu Entry-exit Inspection and Quarantine Bureau； Fuzhou Fujian 350002 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China； Fuzhou Fujian 350002 China； Fuzhou Fujian 350001 China；

【摘要】 Enterobacter cloacae CYS-25 strain was isolated from a chromate plant. This bacterium was capable of resisting high hexavalent chromium concentration and reducing Cr(VI) under aerobic condition. CrO42- stimulated the increase of bacterial size and production of compact convex paths containing chromium on the bacterial surface. The increase of bacterial size was caused by integrative growth but not extracellular polymeric substance hyperplasia. IR and SDS-PAGE analyses showed the extracellular polymeric substance (EPS) components were mainly proteins and had no obvious changes whether the strains were induced by Cr(VI) or not. The EPS was amorphous and contained trivalent chromium. Under CrO42- growth condition, the extracellular substance of Enterobacter cloacae CYS-25 strains and Cr(VI) had redox reaction. The products were Cr3+-protein complexes which formed a piece of compact convex paths on the surface of bacteria and prevented Cr(VI) from entering into cells.更多还原

【Abstract】 Enterobacter cloacae CYS-25 strain was isolated from a chromate plant. This bacterium was capable of resisting high hexavalent chromium concentration and reducing Cr(VI) under aerobic condition. CrO42- stimulated the increase of bacterial size and production of compact convex paths containing chromium on the bacterial surface. The increase of bacterial size was caused by integrative growth but not extracellular polymeric substance hyperplasia. IR and SDS-PAGE analyses showed the extracellular polymeric substance (EPS) components were mainly proteins and had no obvious changes whether the strains were induced by Cr(VI) or not. The EPS was amorphous and contained trivalent chromium. Under CrO42- growth condition, the extracellular substance of Enterobacter cloacae CYS-25 strains and Cr(VI) had redox reaction. The products were Cr3+-protein complexes which formed a piece of compact convex paths on the surface of bacteria and prevented Cr(VI) from entering into cells.更多还原

【关键词】 Enterobacter cloacae； chromium-resistance； extracellular polymeric substance (EPS)；
【Key words】 Enterobacter cloacae； chromium-resistance； extracellular polymeric substance (EPS)；

【基金】 This work was supported by the National Natural Science Foundation of China (20501020, 40772034); Nanoscience Foundation of China (90406024);Natural Science Foundation of Fujian Province (No. X0650094/2006J0383);973 program (2007CB815601); the Special Project on Science and Technology of Fujian Province (2005YZ1026)

【文献出处】结构化学 ,Chinese Journal of Structural Chemistry , 编辑部邮箱 ,2008年01期

【分类号】O611.3
【被引频次】3
【下载频次】59

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