Magnetite (Fe3O4) and greigite (Fe3S4) crystals in multicellular magnetotactic prokaryotes
Magnetite (Fe3O4) and greigite (Fe3S4) crystals in multicellular magnetotactic prokaryotes
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DOI：
10.1080/01490450601134317
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发表时间：
2007-01-01
影响因子：
2.3
通讯作者：
Buseck, Peter R.
中科院分区：
文献类型：
--
作者：
Lins, Ulysses;Keim, Carolina N.;Buseck, Peter R.
趋磁细菌在称为磁小体的细胞器中产生氧化铁、硫化铁或两者兼有。这些细菌大多是单细胞的，并能生物矿化磁铁矿（Fe3O4）。相比之下，由几个革兰氏阴性细胞组成的多细胞致磁原核生物（MMPs）只被知道结晶磁性硫化铁灰长岩（Fe3S4）。在这项工作中，我们描述了在子弹状晶体中矿化磁铁矿的MMPs。另一个不寻常的方面是，磁铁矿要么作为唯一的晶体出现，要么与灰长岩晶体一起出现。磁小体中仅含灰长铁矿的MMPs发生在相同的环境中。这些发现表明，形态、超微结构和行为是MMPs的主要特征，而不是磁小体中生物矿化的磁晶体类型。
Magnetotactic bacteria produce iron oxides, iron sulfides or both in organelles called magnetosomes. Most of these bacteria are unicellular and biomineralize magnetite (Fe3O4). In contrast, multicellular magnetotactic prokaryotes (MMPs) consisting of several gram-negative cells have only been known to crystallize the magnetic iron sulfide greigite (Fe3S4). In this work, we describe MMPs that mineralize magnetite in bullet-shaped crystals. Another unusual aspect is that magnetite occurs either as the only crystals or together with greigite crystals. MMPs containing only greigite in the magnetosomes occur in the same environment. These findings show that morphology, ultrastructure, and behavior are the main characteristics of the MMPs, not the type of magnetic crystal biomineralized in the magnetosomes.