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代谢重新连接和生物质再分配使克拉米多莫纳斯的混合营养生长得以优化
Somnath Koley1,2, Kevin Foley1, Zoee Perrine1
1Donald Danforth Plant Science Center, St. Louis, MO 63132.
概括
藻类的新陈代谢在混合营养条件下发生转变,通过glyoxylate循环保存碳. 这种策略通过减少光合作用产生的代谢负担来优化生长速度.
科学领域:
- *藻类生物技术和代谢工程.
- *环境微生物学和碳循环.
背景情况:
- *水生光合作用系统对于全球碳同化和可再生能源至关重要.
- *藻类生物质的生产受到特定环境的新陈代谢和环境因素的限制.
- * 绿色藻类Chlamydomonas reinhardtii* 在混合营养 (乙酸盐+光) 条件下比光营养或异质营养条件下生长更快.
研究的目的:
- *为了比较Chlamydomonas reinhardtii的自营和混合营养代谢.
- * 调查代谢流变化及其对生长和光合作用的影响.
主要方法:
- *同位素非静态代谢流量分析 (INST-MFA) 使用CO2过渡标记和未标记的酸盐.
- * 转录组学,蛋白组学和代谢组学数据的整合.
- * 自营和混合营养生长下代谢策略的比较.
主要成果:
- *乙酸盐通过氧酸盐循环诱导碳的保存,并抑制混合营养培养中的葡萄糖生成.
- *观察到的代谢流量变化与一些OMIC数据和先前的模型不一致.
- *通过酸盐抑制光合作用与减少光合作用蛋白质含量有关,优化了生长.
结论:
- *克拉米多莫纳斯强硬菌的混合营养生长涉及到协同的代谢重新连接,以节约碳.
- * 减少光合作用蛋白水平代表了混合营养下增长优化策略.
- *了解这些代谢变化是提高藻类生物燃料和原料生产的关键.
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