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新しい操作された植物は農薬に取って代わることができます

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植物科学生化学

Earlham Institute の研究者は、日光と水を使用して蛾の性フェロモンを生成するタバコ植物を設計し、化学合成に代わる持続可能で費用対効果の高い方法を提供しました。 硫酸銅で遺伝子発現を微調整することにより、チームは植物の正常な成長と発達に影響を与えることなく、フェロモン産生をうまく調節しました。

ノリッジのアールハム研究所の研究者は、精密遺伝子工学手法を利用して、タバコ植物を蛾の性フェロモンを生産する太陽光発電工場に変えました。

重要なことに、彼らは、通常の植物の成長に悪影響を与えることなく、これらの分子の生産を効果的に制御する能力を実証しました.

フェロモンは、コミュニケーションの手段として生物によって生成および放出される複雑な化学物質です。 彼らは同じのメンバーを許可します[{” attribute=””>species to send signals, which includes letting others know they’re looking for love.

Farmers can hang pheromone dispersers among their crops to mimic the signals of female insects, trapping or distracting the males from finding a mate. Some of these molecules can be produced by chemical processes but chemical synthesis is often expensive and creates toxic byproducts.

Dr. Nicola Patron, who led this new research and heads the Synthetic Biology Group at the Earlham Institute, uses cutting-edge science to get plants to produce these valuable natural products.

Synthetic biology applies engineering principles to the building blocks of life, DNA. By creating genetic modules with the instructions to build new molecules, Dr. Patron and her group can turn a plant such as tobacco into a factory that only needs sunlight and water.

“Synthetic biology can allow us to engineer plants to make a lot more of something they already produced, or we can provide the genetic instructions that allow them to build new biological molecules, such as medicines or these pheromones,” said Dr. Patron.

In this latest work, the team worked with scientists at the Plant Molecular and Cell Biology Institute in Valencia to engineer a species of tobacco, Nicotiana benthamiana, to produce moth sex pheromones. The same plant has previously been engineered to produce ebola antibodies and even coronavirus-like particles for use in Covid vaccines.

The group built new sequences of DNA in the lab to mimic the moth genes and introduced a few molecular switches to precisely regulate their expression, which effectively turns the manufacturing process on and off.

An important component of the new research was the ability to fine-tune the production of the pheromones, as coercing plants to continuously build these molecules has its drawbacks.

“As we increase the efficiency, too much energy is diverted away from normal growth and development,” explained Dr. Patron.

“The plants are producing a lot of pheromones but they’re not able to grow very large, which essentially reduces the capacity of our production line. Our new research provides a way to regulate gene expression with much more subtlety.”

In the lab, the team set about testing and refining the control of genes responsible for producing the mix of specific molecules that mimic the sex pheromones of moth species, including navel orangeworm and cotton bollworm moths.

They showed that copper sulfate could be used to finely tune the activity of the genes, allowing them to control both the timing and level of gene expression. This is particularly important as copper sulfate is a cheap and readily-available compound already approved for use in agriculture.

They were even able to carefully control the production of different pheromone components, allowing them to tweak the cocktail to better suit specific moth species.

“We’ve shown we can control the levels of expression of each gene relative to the others,” said Dr. Patron. “This allows us to control the ratio of products that are made. Getting that recipe right is particularly important for moth pheromones as they’re often a blend of two or three molecules in specific ratios. Our collaborators in Spain are now extracting the plant-made pheromones and testing them in dispensers to see how well they compare to female moths.”

The team hopes their work will pave the way to routinely using plants to produce a wide range of valuable natural products.

“A major advantage of using plants is that it can be far more expensive to build complex molecules using chemical processes,” said Dr. Patron. “Plants produce an array of useful molecules already so we’re able to use the latest techniques to adapt and refine the existing machinery.

“In the future, we may see greenhouses full of plant factories – providing a greener, cheaper, and more sustainable way to manufacture complex molecules.”

Reference: “Tunable control of insect pheromone biosynthesis in Nicotiana benthamiana” by Kalyani Kallam, Elena Moreno-Giménez, Ruben Mateos-Fernández, Connor Tansley, Silvia Gianoglio, Diego Orzaez and Nicola Patron, 9 April 2023, Plant Biotechnology.
DOI: 10.1111/pbi.14048

The research is part of the SUSPHIRE project, which received support from ERACoBiotech funded by the Horizon 2020 research and innovation program and the UKRI Biotechnology and Biological Sciences Research Council (BBSRC).





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