SAR11海洋细菌需要外源的减少硫来生长
H James Tripp1, Joshua B Kitner, Michael S Schwalbach
1Department of Microbiology, 220 Nash Hall, Oregon State University, Corvallis, Oregon 97331, USA.
Nature
|March 14, 2008
概括
丰富的SAR11海洋细菌无法将硫酸盐转化为硫. 相反,它们专门利用从其他浮游生物中获得的减少硫化合物,如甲或DMSP,以求生存.
科学领域:
- 海洋微生物学 海洋微生物学
- 生物地质化学循环 生物地质化学循环
- 细菌的新陈代谢发生在细菌中.
背景情况:
- 硫对所有生命都至关重要,被纳入氨基酸和有机分子中.
- 空气性海洋细菌通常使用硫酸盐减少进行硫生物合成.
- 人们假设丰富的SAR11类 (alphaproteobacteria) 缺少关键的硫酸盐还原基因.
研究的目的:
- 为了研究SAR11细菌类的硫获取策略.
- 为了确定SAR11细菌是否可以进行同化硫酸盐还原.
- 为了确定SAR11.使用的硫的替代来源.
主要方法:
- 对"Candidatus Pelagibacter ubique" (SAR11) 的基因组分析.
- 对海洋元基因组数据集的分析.
- 使用不同减少硫源 (甲氨酸,DMSP) 的培养实验.
主要成果:
- 在SAR11基因组中,缺乏用于同化硫酸盐还原的必需基因.
- "Candidatus Pelagibacter ubique"需要外源的减少硫化合物才能生长.
- SAR11的增长与3-二甲基硫 propionate (DMSP) 的可用性成正比.
结论:
- 然而,SAR11细菌无法同化硫酸盐.
- 这一类仅依赖于外部来源的减少硫化合物,如DMSP.
- SAR11独特的硫代谢影响了海洋生物地化学硫循环.
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