Plate Nº 98 · recorded November 12, 2026
Biology & EvolutionReported finding
After Decades, Scientists Finally Map Chlorophyll Synthase Structure
Researchers from Germany, Czechia and the UK have deciphered the 3D structure of chlorophyll synthase for the first time, revealing how plants attach the tail that anchors the green pigment.
By Nathan Brooks3 min read576 words
In brief
- First-ever structure of chlorophyll synthase published in Nature Chemical Biology (2026)
- Team included researchers from Osnabrück University, Centre Algatech Třeboň and University of Sheffield
- Cryo-EM experiments were done at the Center for Cellular Nanoanalytics in Osnabrück
- Enzyme was imaged in two states: with and without the hydrophobic tail molecule
- DOI: 10.1038/s41589-026-02357-0
For the first time since the enzyme's discovery decades ago, researchers have worked out the exact three-dimensional structure of chlorophyll synthase — the biological machine that finishes building chlorophyll, the pigment that makes plants green and powers photosynthesis. An international team from Osnabrück University, the Centre Algatech in Třeboň and the University of Sheffield published the results in Nature Chemical Biology (2026).
"Although the enzyme has been known for decades, we have now, for the first time, been able to determine its structure and, through a combination of cryo-electron microscopy, biochemistry and modeling, gain a better understanding of its mechanism," said Dmitry Shvarev, who heads the Emmy Noether Group "Structural Biology of Photosynthetic Microorganisms" at Osnabrück University.
What does the enzyme actually do?
Chlorophyll production is a multistage assembly line. First, the cell builds the part that absorbs light: a ring-shaped molecule with a magnesium ion at its center. That ring alone, though, is incomplete.
The enzyme's job is the final joining step. Chlorophyll synthase catalyzes the reaction that attaches a hydrophobic, oil-like "tail" to the ring. That tail anchors the pigment in place inside the cell's membranes, so the whole assembly can catch sunlight and convert it into chemical energy.
Until now, nobody had seen the enzyme's shape clearly enough to explain how that linkage happens at the molecular level. Knowing the structure changes that: it shows biologists where the tail and ring meet and how the enzyme holds both pieces steady.
How did the team crack it?
Shvarev and his collaborators didn't study plants directly. They used cyanobacteria — photosynthetic bacteria that build chlorophyll the same way plants do, but which are far easier to work with in the lab.
The key experiments ran on a cryo-electron microscope at the Center for Cellular Nanoanalytics in Osnabrück. The technique flash-freezes biological samples and fires an electron beam through them. A computer then combines thousands of images of molecules frozen in different orientations into one high-resolution 3D model.
The researchers captured the enzyme in two states: with the crucial tail molecule bound, and without it. Comparing the pair let them pinpoint the exact spot where the tail attaches to the ring.
Modeling and simulations filled in the rest. Together, the data gave the team what it calls a comprehensive description of chlorophyll synthase's molecular mechanism — effectively a step-by-step account of how the enzyme does its job.
Why does one enzyme's shape matter?
Structure and function go hand in hand in biology. With the enzyme's 3D map in hand, scientists can now test how specific changes to its shape affect chlorophyll production, rather than guessing from indirect biochemical clues.
That matters because chlorophyll sits at the base of nearly every food chain on Earth. Understanding how the pigment is assembled — and which step is the last, most delicate one — gives researchers a sharper target for future work on photosynthesis.
The findings are preliminary in one clear sense: structure papers describe mechanisms, not applications. The study doesn't claim agricultural or biotech payoffs, and any such uses would take years of follow-up research. What it does deliver is foundational knowledge about an enzyme that biologists have studied, blind to its shape, for decades.
Publication details: Dmitry Shvarev et al., "Structure of chlorophyll synthase in complex with the LHC-like protein HliD," Nature Chemical Biology (2026). DOI: 10.1038/s41589-026-02357-0.
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