Plate Nº 52 · recorded October 9, 2026
Chemistry & MaterialsReported finding
Five Plant-Enzyme Mutations Rewired a Mirror-Image Sensor
A 2026 Nature Communications study rebuilt ancient plant enzymes and showed that five mutations — only one inside the active site — turned an unselective borneol dehydrogenase into a precise mirror-image selector.
By Elena Vasquez3 min read656 words
In brief
- Researchers analyzed 97 plant sequences and reconstructed two ancestral borneol dehydrogenases: the unselective N30 and the highly selective N32.
- Only 1 of the 19 amino-acid mutations between N30 and N32 sat in the enzyme's active site; that single change roughly doubled selectivity.
- High selectivity emerged only when the active-site mutation was combined with 3 additional mutations located far from the active site.
- Molecular dynamics simulations showed the preferred borneol form stayed in a productive position longer; the other form slipped and contacted more water.
- Borneol and isoborneol can be derived from the inexpensive bio-based feedstock α-pinene, giving the work potential biotechnology applications.
- Study published in Nature Communications in 2026 (DOI 10.1038/s41467-026-76435-1), led by Freie Universität Berlin, TU Graz, and Georgia Tech.
Five mutations spread across a single plant protein — only one of them inside the chemical reaction zone — rewired an unselective enzyme into a precise selector of mirror-image molecules, a study published in Nature Communications in 2026 reports.
The work traces how plant enzymes called borneol dehydrogenases came to favor one "handedness" of the alcohol borneol over its mirror image, isoborneol. Molecules like borneol, menthol and limonene exist as two near-identical, non-superimposable forms known as enantiomers. They can smell, taste or act differently in the body, even though their atoms connect in the same order.
An international team led by Dr. Bernhard Loll of Freie Universität Berlin, Professor Robert Kourist of Graz University of Technology, and Professor Lynn Kamerlin of Georgia Institute of Technology set out to reconstruct one natural path to that selectivity.
What did the researchers reconstruct?
The team focused on borneol dehydrogenases, plant enzymes that convert borneol into camphor. Using a technique called ancestral sequence reconstruction, they computationally worked backward through a family tree of 97 plant sequences to infer the amino-acid sequences of ancient enzymes, then rebuilt those proteins in the lab.
They compared two ancestors:
- N30, the oldest, which barely distinguished the two borneol forms
- N32, a later descendant that strongly preferred one form
Between N30 and N32 lay 19 mutations to individual amino acids — the building blocks of proteins.
How did they identify the decisive changes?
Only one of those 19 mutations sat in the active site, the pocket where the chemical reaction happens. Putting that single mutation into the unselective N30 roughly doubled its preference for one borneol form. Reversing it in N32 erased the selective enzyme's preference.
But one mutation was not enough to make N30 strongly selective. High selectivity appeared only after researchers added three further mutations located far from the active site.
The team's central finding: the full effect required the combination of the active-site change with three peripheral mutations, showing that even distant regions of an enzyme can shape chemistry at the catalytic site.
What explains the new selectivity at the molecular level?
The reconstructed enzymes looked almost identical in static structure, so the team turned to molecular dynamics simulations — computer calculations that track atoms in motion. The simulations revealed a behavioral difference:
- The preferred borneol form stayed bound in a catalytically productive position longer
- The less-preferred form slipped more often and made greater contact with surrounding water
In other words, enzyme dynamics — how the protein and substrate wiggle together — did most of the discriminating. Dr. Loll summarized the team's view: "What was crucial here was not major structural changes to the enzyme but the interplay of many small changes that influenced the dynamics of the enzyme and bound molecule."
What does this mean for biotechnology?
Borneol and isoborneol can be obtained as a mixture from α-pinene, an inexpensive plant-derived starting material. Enzymes that pick out one form could help drug, cosmetic and fragrance makers produce single-enantiomer products or separate them from mixtures without expensive chemical steps.
The deeper message: enzyme engineers should look past the active site. Conventional design strategies often concentrate on the pocket where chemistry happens. This study suggests that small edits in distant, "peripheral" regions can tune selectivity through dynamics, and those edits may otherwise go unnoticed.
How reliable are the findings?
The work rests on laboratory reconstruction of inferred ancestral proteins plus computational modeling. Ancestral sequence reconstruction carries the usual caveat: ancient sequences are statistical estimates, not direct observations, and dynamics simulations depend on chosen force fields and timescales. The team tested only one enzyme family and one pair of substrates, so the principle needs confirming across other lineages.
Loll framed the practical outlook: "This provides us with important indications of how enzymes could be specifically engineered for biotechnological applications in the future."
The paper, by Jasmin Zuson and colleagues, carries the DOI 10.1038/s41467-026-76435-1.
via Phys.org Biology (Source)
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