Hybrid biosynthesis of roseobacticides from algal and bacterial precursor molecules.

Hybrid biosynthesis of roseobacticides from algal and bacterial precursor molecules.
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DOI:
10.1021/ja508782y
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发表时间:
2014-10-29
影响因子:
15
通讯作者:
Clardy J
Clardy J
中科院分区:
化学1区
文献类型:
--
作者:
Seyedsayamdost MR;Wang R;Kolter R;Clardy J

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杀玫瑰杆菌剂调节海洋细菌(Phaeobacticides)和海洋微生物(Emiliania huxleyi)之间的共生关系。这种关系可以是互惠的,当藻类宿主为细菌提供食物并且细菌为藻类产生生长激素和抗生素时,或者是寄生的,当藻类衰老并释放p-香豆酸时。释放的对香豆酸导致细菌合成rosobacticides,这是藻类的nM−μM毒素。我们研究了rosebobacticides的生物合成,并报告说,所有rosebacticide前体在共生的互利阶段发挥关键作用。杀玫瑰杆菌剂是由藻类生长促进剂、由藻类细胞提供的主要食物分子和启动互利共生体到寄生物转换的藻类衰老信号生物合成的。因此,在互利共生过程中有益的分子在寄生过程中被转移到毒素的合成中。提出了一种从这些分子组装rosebacticides的合理机制。
Roseobacticides regulate the symbiotic relationship between a marine bacterium (Phaeobacter inhibens) and a marine microalga (Emiliania huxleyi). This relationship can be mutualistic, when the algal host provides food for the bacteria and the bacteria produce growth hormones and antibiotics for the algae, or parasitic, when the algae senesce and release p-coumaric acid. The released p-coumaric acid causes the bacteria to synthesize roseobacticides, which are nM−μM toxins for the algae. We examined the biosynthesis of roseobacticides and report that all roseobacticide precursors play critical roles during the mutualist phase of the symbiosis. Roseobacticides are biosynthesized from the algal growth promoter, the major food molecule provided by the algal cells, and the algal senescence signal that initiates the mutualist-to-parasite switch. Thus, molecules that are beneficial during mutualism are diverted to the synthesis of toxins during parasitism. A plausible mechanism for assembling roseobacticides from these molecules is proposed.
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