给变暖的世界种更耐热的庄稼：科学家用 AlphaFold 强化光合作用关键酶
Engineering more resilient crops for a warming climate
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导读
全球变暖带来干旱与热浪，部分主粮作物的收成正在缩水；更隐蔽的伤害发生在植物内部——高温会破坏维持其生命的分子机器。这套机器运转的核心是光合作用，植物靠细胞内一整套酶的精密编排把光变成葡萄糖，而全球升温会让这套编排失序。密歇根州立大学副教授 Berkley Walker 的工作就是让它重回节拍：他说自然界本来就藏着大量耐热的酶蓝图，我们的任务是向这些例子学习、把同样的韧性造出来——团队正用 AlphaFold 强化光合作用里至关重要的那个酶。
推荐理由
把气候变化、粮食与蛋白设计串在一起，是 AI for Science 落地叙事的好样本。
主体与标签
Google#论文/研究#科研应用
正文
Scientists are using AlphaFold in their research to strengthen an enzyme that’s vital to photosynthesis, paving the way for more heat-tolerant crops.
As global warming accompanies more droughts and heatwaves, harvests of some staple crops are shrinking. But less visible is what is happening inside these plants, where high heat can break down the molecular machinery that keeps them alive.
At the heart of that machinery lies a sun-powered process that supports virtually all life on Earth: photosynthesis. Plants use photosynthesis to produce the glucose that fuels their growth via an intricate choreography of enzymes inside plant cells. As global temperatures rise, that choreography can falter.
Berkley Walker, an associate professor at Michigan State University, spends his days thinking about how to keep that choreography in step. "Nature already holds the blueprints for lots of enzymes that can handle heat," he says. "Our job is to learn from those examples and build that same resilience into the crops we depend on."
Walker’s lab focuses on a vital enzyme in photosynthesis called glycerate kinase (GLYK), an enzyme that helps plants recycle carbon during photosynthesis.One hypothesis is that, if it gets too hot, GLYK stops working, and photosynthesis fails.
Walker’s team set out to understand why. Because the structure of GLYK has never been determined experimentally, they turned to AlphaFold to predict its 3D shape, not only in plants but also in a heat-loving algae that thrives in volcanic hot springs. By taking AlphaFold’s predicted shapes and plugging them into sophisticated molecular simulations, the researchers could watch as these enzymes flexed and twisted as the temperature rose.
That’s when the problem came into focus: three flexible loops in the plant version of GLYK wobbled out of shape at high heat.
Experiments alone could never deliver such insights, says Walker: “AlphaFold enabled access to experimentally unavailable enzyme structures and helped us identify key sections for modification.”
Armed with this knowledge, the researchers in Walker’s lab made a series of hybrid enzymes that replaced the unstable loops in the plant GLYK with more rigid ones borrowed from the algae’s GLYK. One of these performed spectacularly, remaining stable at temperatures up to 65 °C.