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Functional divergence of a trypsin protease underpins phosphate signaling in a diatom
编号：1487 访问权限：仅限参会人 更新：2026-09-01 00:58:36 浏览：0次 口头报告

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摘要
  • Phosphate availability constrains growth across plant and algal lineages, yet the intracellular regulatory mechanisms linking external phosphate signals to acclimation responses remain incompletely understood. Protease families are highly expanded in photosynthetic eukaryotes, but whether individual protease paralogues have evolved regulatory roles in nutrient signaling is largely unexplored.
  • Here, we identify a trypsin protease, PtTryp8, as a key regulatory component of phosphate acclimation in the diatom Phaeodactylum tricornutum. Loss of PtTryp8 impaired growth, and phosphate uptake dynamics.
  • Transcriptome profiling revealed coordinated dysregulation of phosphate-responsive genes, including transporters, signaling components, and membrane trafficking pathways. Notably, PtTryp8 disruption selectively altered Ca²⁺-dependent protein kinase expression, consistent with a role in signal integration rather than bulk proteolysis. Comparative analyses indicate that PtTryp8 has diverged functionally from other trypsin paralogues, supporting isozyme specialization within diatom protease families.
  • Together, these findings reveal a previously unrecognized role for proteolytic signaling in phosphate sensing and acclimation, and suggest that regulatory diversification of proteases represents a general strategy for nutrient adaptation in photosynthetic eukaryotes.
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报告人
Xueqiong Sun
Xiamen University

稿件作者
Xueqiong Sun Xiamen University
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重要日期

  • 会议日期

    01月12日

    2027

    至

    01月15日

    2027

  • 07月21日 2026

    初稿截稿日期

  • 01月15日 2027

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University (MEL)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
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