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Genomic analysis of a pure culture of magnetotactic bacterium Terasakiella ***-1

Journal of Oceanology and Limnology 2021年第6期39卷 2097-2106页

作者： Haijian DU Wenyan ZHANG Wei LIN hongmiao pan Tian XIAO Long-Fei WU College of Life Science Shandong UniversityQingdao 266237China CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institutions of Earth Science Chinese Academy of SciencesBeijing 100029China France-China Joint Laboratory for Evolution and Development of Magnetotactic Multicellular Organisms Chinese Academy of SciencesBeijing 100029China Aix-Marseille University CNRSLCBMarseille F-13402France

Magnetotactic bacteria(MTB)display magnetotaxis ability because of biomineralization of intracellular nanometer-sized,membrane-bound organelles termed *** having been discovered more than half a century,only a few representatives of MTB have been isolated and cultured in the *** this study,we report the genomic characterization of a novel marine magnetotactic spirillum strain SH-1 belonging to the genus Terasakiella that was recently isolated.A gene encoding haloalkane dehalogenase,which is involved in the degradation of chlorocyclohexane,chlorobenzene,chloroalkane,and chloroalkene,was ***-1 genome contained cysCHI and soxBAZYX genes,thus potentially capable of assimilatory sulfate reduction to H_(2)S and using thiosulfate as electron donors and oxidizing it to *** of SH-1 also contained genes encoding periplasmic dissimilatory nitrate reductases(napAB),assimilatory nitrate reductase(nasA)and assimilatory nitrite reductases(nasB),suggesting that it is capable of gaining energy by converting nitrate to *** pure culture of Terasakiella ***-1 together with its genomic results off ers new opportunities to examine biology,physiology,and biomineralization mechanisms of MTB.

关键词： magnetotactic bacteria magnetotaxis pure culture comparative genomic analysis

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Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay,China

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Journal of Oceanology and Limnology 2021年第6期39卷 2053-2062页

作者： Si CHEN Kaixuan CUI Wenyan ZHANG Yicong ZHAO Tian XIAO hongmiao pan Wuchang ZHANG Long-Fei WU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC) CNRS-CASQingdao 266071China Aix Marseille Univ CNRSLCBIM2BIMMMarseille 13009France

Magnetotactic bacteria(MTB)are a group of prokaryotes having the ability to orient and swim along geomagnetic field lines because they contain intracellular magnetosomes that are synthesized through a biomineralization *** have recently also been found in unicellular eukaryotes,which are referred to as magnetically responsive protists(MRPs).The magnetosomes have three origins in *** this study,we characterized a MTB-grazing ciliated MRP that was magnetically collected from intertidal sediment of Huiquan Bay,Qingdao,*** on 18S rRNA gene sequence analysis,the ciliated MRP was tentatively identified as Uronemella parafi lificum *** transmission electron microscopy,we observed that magnetosomes having 2-3 shapes were randomly distributed within this *** X-ray spectroscopy and high-resolution transmission electron microscopy images of the magnetosomes were consistent with them being composed of *** having the same shape and mineral composition were also detected in MTB that occurred in the same environment as the ciliated *** analysis showed that the size and shape of the magnetosomes in the ciliated MRP were similar to those in *** results suggest that this ciliated MRP can graze,ingest,and digest various types of *** is certainly worth noting that this is the first record of MRPs in Asian aquatic sediment and suggesting they might be widely *** results also support the assertion that MRPs probably contribute to the ecological cycles of iron,and expand possibilities for research into the mechanism of magnetoreception in eukaryotes.

关键词： magnetically responsive protist ciliate magnetotactic bacteria magnetosome graze magnetoreception

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Archaeal community structure in sediments from a seamount in the Mariana Volcanic Arc

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Journal of Oceanology and Limnology 2019年第4期37卷 1197-1210页

作者： ZHANG Wenyan LIU Jia DONG Yi LI Xuegang XU Cong XIAO Tian pan hongmiao WU Long-Fei Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms (LIA-MagMC) CNRS-CAS Marseille-Beijing-Qingdao-Sanya Aix Marseille Univ CNRS LCB Marseille 31 chemin Joseph Aiguier F-13402 France Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071 China

Seamounts are subsurface mountains in the ocean. Examination of the abundance and distribution of Archaea in seamount ecosystems may provide a better understanding of their ecological functions. Most studies of marine archaeal assemblages in seamount area have focused on hydrothermal vents or ferromanganese crusts. We investigated the archaeal communities from a seamount of the Mariana Volcanic Arc, in the tropical western Pacific Ocean by using high-throughput sequencing. Thaumarchaeota was dominant in the sediments of all sample stations. Community diversity and species richness were greatest at stations near the top of the seamount, and lowest at the deepest station. One sample station on the steep southeast slope that faced the Yap-Mariana trench had a unique composition of Archaea. In summary, depth has an important influence on archaeal community structure, and the geographic properties and sediment characteristics may explain the unique distribution patterns of Archaea in this seamount. This study provides a foundation for future research on Archaea in seamounts.

关键词： seamount archaeal diversity community structure Nitrosopumilales

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Characterization of uncultivated magnetotactic bacteria from the sediments of Yuehu Lake, China

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Acta Oceanologica Sinica 2017年第2期36卷 94-104页

作者： DU Haijian ZHANG Rui ZHANG Wenyan XU Cong CHEN Yiran pan hongmiao ZHOU Ke WU Long-fei XIAO Tian Key Laboratory for Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China College of Resources and Environment Qingdao Agriculture University Qingdao 266109 China Aix Marseille Université CNRS LCB UMR 7257 Institut de Microbiologie de la Méditerranée Marseille F-13402 France University of Chinese Academy of Sciences Beijing 100049 China

Marine magnetotactic bacteria were collected from the intertidal sediments of Yuehu Lake（China）, where their abundance reached 103–104 ind./cm3. Diverse morphotypes of magnetotactic bacteria were observed, including cocci and oval, vibrio-, spirillum-, rod-, elliptical-, handle- and bar-shaped forms. The magnetococci were the most abundant, and had flagella arranged in parallel within a bundle. The majority of magnetosomes were arranged in one, two or multiple chains, although irregular arrangements were also evident. All the results of high-resolution transmission electron microscopy（HRTEM） analysis show that magnetosome crystals were composed of Fe3O4, and their morphology was specific to particular cell morphotypes. By the 16 S r RNA gene sequence analysis, we found fourteen operational taxonomic units（OTUs） which were related to magnetotactic bacteria. Among these, thirteen belonged to the Alphaproteobacteria and one to the *** with known axenic and uncultured marine magnetotactic bacteria, the 16 S r RNA gene sequences of most magnetotactic bacteria collected from the Yuehu Lake exhibited sequence identities ranging from 90.1% to96.2%（〈97%）. The results indicate that microbial communities containing previously unidentified magnetotactic bacteria occur in the Yuehu Lake.

关键词： magnetotactic bacteria magnetosome biodiversity Yuehu Lake intertidal sediments

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Characterization and diversity of magnetotactic bacteria from sediments of Caroline Seamount in the Western Pacific Ocean

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Journal of Oceanology and Limnology 2021年第6期39卷 2027-2043页

作者： Kaixuan CUI Wenyan ZHANG Jia LIU Cong XU Yicong ZHAO Si CHEN hongmiao pan Tian XIAO Long-Fei WU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC) CNRS-CASQingdao 266071China Aix Marseille Univ CNRSLCBIM2BIMMMarseille 13009France National Oceanographic Center Qingdao 266071China

Magnetotactic bacteria(MTB)are a group of microorganisms capable of orientating and swimming along magnetic fields because they contain intracellular biomineralized magnetosomes composed of magnetite(Fe 3 O 4)or/and greigite(Fe_(3)S_(4)).They are ubiquitous in freshwater,brackish,and marine habitats,and are cosmopolitan in ***,knowledge of their occurrence and distribution in seamount ecosystems is *** investigated the diversity and distribution of MTB in the Caroline Seamount(CM4).The abundance of living MTB in 12 stations in depth varying from 90 to 1545 m was 1.1×10^(3)-43.7×10^(3) inds./dm *** diverse shapes of MTB observed,magnetotactic cocci were the dominant morphotype and could be categorized into two types:1)typical cocci that appeared to have peritrichous fl agella;and 2)those characterized by having a drop-shaped form and one bundle of fl agella located at the thin/narrow end of the *** electron microscopy(TEM)analysis revealed that the magnetosomes formed by those magnetotactic cocci are magnetite(Fe 3 O 4)with octahedral crystal habit.A total of 41 operational taxonomic units(OTUs)of putative MTB(2702 reads)were acquired from nine stations,based on high-throughput *** these,40 OTUs belonged to the Proteobacteria phylum and one belonged to the Nitrospirae *** found apparent connectivity between the MTB populations on the Caroline and Kexue(Science in Chinese)seamounts,although the diversity of MTB on Caroline was much richer than on the Kexue *** results imply that the unique topography of seamounts and other as-yet unclear environmental factors could lead to evolution of different fl agella arrangements in magnetotactic cocci,and the occurrence of octahedral magnetite magnetosomes.

关键词： magnetotactic bacteria Caroline Seamount abundance diversity magnetosome

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Characterization of dominant giant rod-shaped magnetotactic bacteria from a low tide zone of the China Sea

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Journal of Oceanology and Limnology 2018年第3期36卷 783-794页

作者： TENG Zhaojie ZHANG Wenyan CHEN Yiran pan hongmiao XIAO Tian WU Long-Fei CAS Key Laboratory of Marine Ecology ＆ Environmental Sciences Institute of OceanologyChinese Academy of Sciences Qingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266000China Laboratoire de Chimie Bacterienne UMR7283Institut de Microbiologie de la MediterraneeAix-Marseille UniversiteCNRS MarseilleFrance Laboratoire International Associe de la Bio-Mineralisation et Nano-Structures CNRSMarseilleFrance

Magnetotactic bacteria are a group of Gram-negative bacteria that synthesize magnetic crystals, enabling them to navigate in relation to magnetic field lines. Morphologies of magnetotactic bacteria include spirillum, coccoid, rod, vibrio, and multicellular morphotypes. The coccid shape is generally the most abundant morphotype among magnetotactic bacteria. Here we describe a species of giant rod-shaped magnetotactic bacteria(designated QR-1) collected from sediment in the low tide zone of Huiquan Bay(Yellow Sea, China). This morphotype accounted for 90% of the magnetotactic bacteria collected, and the only taxonomic group which was detected in the sampling site. Microscopy analysis revealed that QR-1 cells averaged(6.71±1.03)×(1.54±0.20) m m in size, and contained in each cell 42–146 magnetosomes that are arranged in a bundle formed one to four chains along the long axis of the cell. The QR-1 cells displayed axial magnetotaxis with an average velocity of 70±28 mm/s. Transmission electron microscopy based analysis showed that QR-1 cells had two tufts of fl agella at each end. Phylogenetic analysis of the 16 S r RNA genes revealed that QR-1 together with three other rod-shaped uncultivated magnetotactic bacteria are clustered into a deep branch of A lphaproteobacteria.

关键词： Alphaproteobacteria flagella motility rod-shaped magnetotactic bacteria

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How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?

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Journal of Oceanology and Limnology 2021年第6期39卷 2005-2014页

作者： Xinxin QIAN Yicong ZHAO Claire-Lise SANTINI hongmiao pan Tian XIAO Haitao CHEN Tao SONG Jinhua LI Francois ALBERTO Sophie BRUSTLEIN Long-Fei WU State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Aix Marseille University CNRSLCBCenturiIM2BIMMMarseille 13009France International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC) CNRS-CASMarseille 13402France CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Aix Marseille University CenturiMarseille 13009France

Magnetotactic bacteria(MTB)synthesize intracellular magnetic organelles,magnetosomes,which consist of magnetic crystals that are enveloped in a *** are organized into a chain(s)and confer on cells a magnetic dipolar *** magnetic property allows MTB cells to align and swim along geomagnetic field lines,a movement referred to as *** MTB species change their swim direction in response to illumination by UV,violet and blue *** we analyzed the polarity of morphology,magnetism,and motion in Mediterranean multicellular magnetotactic prokaryotes,also called,magnetoglobules or *** magnetoglobules were assembled from 60-80 cells into an asymmetric ellipsoidal morphology with a relative narrow and large *** swam dominantly northward,parallel to the direction of the magnetic field,with the narrow-end as the leading *** response to a reversal in the direction of the magnetic field,they aligned quickly along the magnetic field lines and kept swimming ***,under constant illumination,385-nm UV light,magnetoglobules changed their swimming direction southward anti-parallel to the direction of the magnetic field,with the large-end as the leading *** change from a northward to southward direction occurred along with an increase of swimming speed.A minimum of 35-mW/cm^(2) irradiance of UV light was sufficient to trigger the swimming *** radiation also triggered the unidirectional division of *** these results revealed a coordination of the polarity of magnetoglobule morphology,magnetic moment,and swimming orientation,in response to magnetic and optical *** UV triggered the reversal of magnetotaxis and magnetoglobule division indicating the ecological significance of light for multicellular magnetotactic prokaryotes.

关键词： photo-response magnetic alignment coordinated swimming

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新型海洋趋磁细菌YSC-1的磁性能分析

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高技术通讯 2005年第8期15卷 107-110页

作者：高峻宋涛潘红苗吴龙飞岳海东肖天中国科学院海洋研究所海洋生态与环境科学重点实验室青岛266071 中国科学院电工研究所北京100080 中国科学院海洋研究所海洋生态与环境科学重点实验室青岛266071中国科学院研究生院北京100864 法国科研中心马赛结构生物学-微生物学研究所细菌化学实验室马赛

对从黄海冷水团附近海域的底泥中分离到的一株新型海洋趋磁细菌YSC-1的磁特性进行了分析.对YSC-1菌株进行的磁铁吸附实验显示YSC-1菌株有一定的磁性、核磁共振(MRI)测定表明菌体中包含磁性材料,磁性能测量结果证明YSC-1的菌体沉淀有磁性... 详细信息

对从黄海冷水团附近海域的底泥中分离到的一株新型海洋趋磁细菌YSC-1的磁特性进行了分析.对YSC-1菌株进行的磁铁吸附实验显示YSC-1菌株有一定的磁性、核磁共振(MRI)测定表明菌体中包含磁性材料,磁性能测量结果证明YSC-1的菌体沉淀有磁性,但磁性较弱,磁滞回线测量显示YSC-1菌株中含有铁磁材料,饱和磁矩约为40memu/g.每个细菌的磁矩为:3.06×10-14emu.

关键词：海洋趋磁细菌 YSC-1 磁特性核磁共振磁滞回线菌株磁小体生物磁学

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多细胞趋磁原核生物研究进展

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生态学报 2010年第12期30卷 3311-3318页

作者：张圣妲潘红苗周克肖天吴龙飞中国海洋大学海洋生命学院青岛266003 中国科学院海洋研究所海洋生态与环境科学重点实验室青岛266071 中国科学院烟台海岸带研究所烟台264003 中国科学院研究生院北京100039 中法生物矿化与纳米结构联合实验室法国科研中心马赛地中海微生物研究所

多细胞趋磁原核生物指一类由含有磁小体的革兰氏阴性原核细胞聚集而成的球形或者卵球形细胞聚集体,一般由745个细胞组成,直径在223μm之间,它们可在地磁场或外加磁场中沿磁力线定位并做定向运动。通过对巴西潟湖、美国盐湖、德国和法国... 详细信息

多细胞趋磁原核生物指一类由含有磁小体的革兰氏阴性原核细胞聚集而成的球形或者卵球形细胞聚集体,一般由745个细胞组成,直径在223μm之间,它们可在地磁场或外加磁场中沿磁力线定位并做定向运动。通过对巴西潟湖、美国盐湖、德国和法国海岸带花瓣型MMPs以及最近对中国青岛海域潮间带菠萝型MMPs研究结果的总结,分别从MMPs的生物学特征、细胞内容物以及生态学分布及分类地位等方面的研究进行综述,并对未来研究方向进行一定的展望。

关键词：多细胞趋磁原核生物趋磁性铁氧化物型磁小体铁硫化物型磁小体进化

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Deciphering the role of mtH2O2 in hepatic ischemia-reperfusion injury mechanisms with low-background super-resolution fluorogenic probe

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Science China Chemistry 2025年第1期68卷 297-307页

作者： Bin Fang Limin Wang Haoqin Li Jiaxin Zhang Yang Ding pan pan Li Bo Peng Hua Bai Lin Li Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials &Engineering Northwestern Polytechnical University Institute of Flexible Electronics (IFE Future Technologies) Xiamen University

Hepatic ischemia-reperfusion injury（HIRI） is characterized by mitochondrial dysfunction and oxidative stress. Monitoring mitochondrial hydrogen peroxide（mtH2O2） levels in real-time through super-resolution imaging is crucial for elucidating its distribution in live cells and its mechanism of action during HIRI. However, low-background fluorogenic probes have been overlooked in the context of super-resolution imaging. In this study, we developed a low-background fluorogenic probe（MitoWG） with the potential for super-resolution morphology-correlated mitochondrial identification to track the fluctuates of mtH2O2in HIRI. Activation of the desirable fluorescence properties of the probe by mtH2O2was confirmed using structural illumination microscopy（SIM）, enabling high-quality mitochondrial imaging with exceptional specificity and *** in mtH2O2levels were successfully observed in both cellular and rat models of HIRI. Furthermore, we associated the decline in mitochondrial redox homeostasis with accelerated mtH2O2production during HIRI, which triggered mitophagy deficiency and led to cell death. In conclusion, Mito-WG possesses excellent photophysical and low-background properties for SIM imaging, making it a promising tool for mtH2O2tracking in HIRI research and clinical diagnosis.

关键词： hepatic ischemia-reperfusion injury low-background mtH2O2-activatable super-resolution imaging fluorogenic probe

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