Bacteria mediate methylation of iodine in marine and terrestrial environments
Bacteria mediate methylation of iodine in marine and terrestrial environments
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DOI：
10.1128/aem.67.6.2718-2722.2001
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发表时间：
2001-06-01
影响因子：
4.4
通讯作者：
Muramatsu, Y
中科院分区：
文献类型：
--
作者：
Amachi, S;Kamagata, Y;Muramatsu, Y
碘甲烷（CH,I）在自然碘循环中发挥着重要作用，并参与大气臭氧的破坏。然而，这种化合物在自然界中的主要来源仍不清楚。在这里，我们报告说，包括陆地和海洋细菌在内的多种细菌都能够甲基化环境水平的碘化物（0.1 μM）。测试菌株中，选择Rhizobium sp菌株MRCD 19进行进一步分析，发现细胞提取物以S-腺苷-L-蛋氨酸为甲基供体催化碘化物甲基化。这些结果有力地表明细菌有助于碘从陆地和海洋生态系统转移到大气中。
Methyl iodide (CH,I) plays an important role in the natural iodine cycle and participates in atmospheric ozone destruction. However, the main source of this compound in nature is still unclear. Here we report that a wide variety of bacteria including terrestrial and marine bacteria are capable of methylating the environmental level of iodide (0.1 muM). Of the strains tested, Rhizobium sp, strain MRCD 19 was chosen for further analysis, and it was found that the cell extract catalyzed the methylation of iodide with S-adenosyl-L-methionine as the methyl donor. These results strongly indicate that bacteria contribute to iodine transfer from the terrestrial and marine ecosystems into the atmosphere.