数字农科院2.0

A heat-inducible expression system for external control of gene expression in plastids

文献类型： 外文期刊

作者： Xu, Wenbo;Li, Shengchun;Bock, Ralph;Zhang, Jiang

作者机构：

关键词： （0-1-3）plastid transformation;pL/pR;cI857;heat-inducible expression;T7 RNA polymerase;Nicotiana tabacum

期刊名称： Plant Biotechnology Journal

ISSN： 1467-7644

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Inducible expression systems can overcome the trade-off between high-level transgene expression and its pleiotropic effects on plant growth. In addition, they can facilitate the expression of biochemical pathways that produce toxic metabolites. Although a few inducible expression systems for the control of transgene expression in plastids have been developed, they all depend on chemical inducers and/or nuclear transgenes. Here we report a temperature-inducible expression system for plastids that is based on the bacteriophage lambda leftward and rightward promoters (pL/pR) and the temperature-sensitive repressor cI857. We show that the expression of green fluorescent protein (GFP) in plastids can be efficiently repressed by cI857 under normal growth conditions, and becomes induced over time upon exposure to elevated temperatures in a light-dependent process. We further demonstrate that by introducing into plastids an expression system based on the bacteriophage T7 RNA polymerase, the temperature-dependent accumulation of GFP increased further and was similar to 24 times higher than expression driven by the pL/pR promoter alone, reaching similar to 0.48% of the total soluble protein. In conclusion, our heat-inducible expression system provides a new tool for the external control of plastid (trans) gene expression that is cost-effective and does not depend on chemical inducers.

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