iTRAQ-Based Quantitative Proteomic Analysis of a Toxigenic Dinoflagellate Alexandrium catenella at Different Stages of Toxin Biosynthesis during the Cell Cycle

文献类型： 外文期刊

第一作者： Zhang, Shu-Fei

作者： Zhang, Shu-Fei;Zhang, Yong;Lin, Lin;Wang, Da-Zhi;Zhang, Shu-Fei;Zhang, Yong;Wang, Da-Zhi

作者机构：

关键词： dinoflagellates; Alexandrium catenella; paralytic shellfish toxins; cell cycle; toxin biosynthesis; quantitative proteomics; iTRAQ

期刊名称：MARINE DRUGS （ 影响因子：5.118； 五年影响因子：5.951 ）

ISSN： 1660-3397

年卷期： 2018 年 16 卷 12 期

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收录情况： SCI

摘要： Paralytic shellfish toxins (PSTs) are a group of potent neurotoxic alkaloids that are produced mainly by marine dinoflagellates. PST biosynthesis in dinoflagellates is a discontinuous process that is coupled to the cell cycle. However, little is known about the molecular mechanism underlying this association. Here, we compared global protein expression profiles of a toxigenic dinoflagellate, Alexandrium catenella, collected at four different stages of toxin biosynthesis during the cell cycle, using an isobaric tags for relative and absolute quantification (iTRAQ)-based quantitative proteomic approach. The results showed that toxin biosynthesis occurred mainly in the G1 phase, especially the late G1 phase. In total, 7232 proteins were confidently identified, and 210 proteins exhibited differential expression among the four stages. Proteins involved in protein translation and photosynthetic pigment biosynthesis were significantly upregulated during toxin biosynthesis, indicating close associations among the three processes. Nine toxin-related proteins were detected, and two core toxin biosynthesis proteins, namely, sxtA and sxtI, were identified for the first time in dinoflagellates. Among these proteins, sxtI and ompR were significantly downregulated when toxin biosynthesis stopped, indicating that they played important roles in the regulation of PST biosynthesis. Our study provides new insights into toxin biosynthesis in marine dinoflagellates: nitrogen balance among different biological processes regulates toxin biosynthesis, and that glutamate might play a key modulatory role.

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