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| 青岛海洋趋磁球菌QH-3 的鞭毛特征 |
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周 克1,2,3, 潘红苗2, 岳海东2, 肖 天2,4, 吴龙飞4,5
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1.中国科学院烟台海岸带研究所;2.中国科学院海洋研究所海洋生态与环境科学重点实验室;3.中国科学院研究生院;4.中法生物矿化与纳米结构联合实验室;5.法国科研院马赛地中海微生物研究所细菌化学实验室
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| 摘要: |
| 趋磁细菌(magnetotactic bacteria, MTB)是一类能够沿着磁力线运动的特殊细菌。MTB 在胞内磁小体的导向下借助自身鞭毛进行趋磁趋氧运动, 以到达适宜的生境。本研究在青岛潮间带沉积物中发现大量的趋磁球菌, 通过光镜与透射电镜对其运动方式与显微结构进行观察。结果显示优势趋磁细菌为卵球形, 大小为2.5 μm×2.1 μm, 宽长比为0.85, 将其命名为QH-3。QH-3 为趋北型(North-seeking)MTB, 运动速度88 μm/s, 细胞内两侧各有一条由棱柱形颗粒组成的磁小体链。QH-3 在菌体同一侧有两个由直径62 nm±9 nm 的鞘包裹7 根鞭毛组成的鞭毛束。这种特殊的鞭毛结构与已报道的致病菌的不同, 而与法国地中海趋磁球菌MO-1 的相似。 |
| 关键词: 趋磁球菌 鞭毛鞘 潮间带 青岛 |
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| 基金项目:国家自然科学基金项目(NSFC40776094 和40906069); 中国科学院海外杰出学者基金项目(2006-1-15); 王宽诚教育基金会项目 |
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| Architecture of flagellar apparatus of marine magnetotactic cocci from Qingdao |
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| Abstract: |
| Magnetotactic bacteria can align and swim along the geomagnetic field lines. The motility is propelled by the rotation of semi-rigid flagellar filaments. In this study, we reported the motility and ultrastructure of marine magnetotactic cocci isolated from intertidal zone in Qingdao city. Results obtained by optical microscopy and transmission electron microscopy showed that these ovoid-shaped bacteria, QH-3, possessed two bundles of flagella. Each bundle with a diameter of about 62 nm ±9 nm consists of seven flagellar filaments enveloped in a sheath. The architecture of flagellar apparatus was similar to that of Mediterranean magneto-ovoid bacteria MO-1. However, QH-3 synthesized two chains of rectangular magnetosomes instead of one chain found in MO-1 cells. Such flagellar architecture has been reported only for some magnetotactic cocci. This observation suggests that the typical structure of the flagellar apparatus may be required for the magnetotactic motility of this group of microbes. |
| Key words: magnetotactic bacteria flagellar sheath intertidal zone Qingdao |