A rare cancer-fighting plant compound has been decoded

Mitraphylline belongs to a unique class of plant chemicals known as spirooxindole alkaloids. These molecules are recognized for their unusual twisted ring structures and their powerful biological effects, including anti inflammatory and anti tumor activity.

Even though scientists have studied these compounds for years, the exact molecular steps plants use to produce them had remained unknown.

Breakthrough Discovery in Plant Chemistry

That mystery began to unravel in 2023 when Dr. Thu-Thuy Dang’s team in UBC Okanagan’s Irving K. Barber Faculty of Science identified the first known plant enzyme capable of twisting a molecule into the distinctive spiro shape.

Building on that earlier finding, doctoral student Tuan-Anh Nguyen led new research that uncovered two critical enzymes involved in the production of mitraphylline. One enzyme organizes the molecule into the correct three dimensional structure, while the second transforms it into mitraphylline itself.

“This is similar to finding the missing links in an assembly line,” says Dr. Dang, UBC Okanagan Principal’s Research Chair in Natural Products Biotechnology. “It answers a long-standing question about how nature builds these complex molecules and gives us a new way to replicate that process.”

Why Mitraphylline Is So Valuable

Many promising natural compounds are found only in tiny amounts inside plants, making them difficult and expensive to recreate in laboratories. Mitraphylline is one of those rare substances. It exists only in trace quantities in tropical trees such as Mitragyna (kratom) and Uncaria (cat’s claw), both members of the coffee family.

Now that researchers have identified the enzymes responsible for shaping and assembling mitraphylline, they have a clearer path toward producing the compound and related molecules in more sustainable ways.

“With this discovery, we have a green chemistry approach to accessing compounds with enormous pharmaceutical value,” says Nguyen. “This is a result of UBC Okanagan’s research environment, where students and faculty work closely to solve problems with global reach.”

Nguyen also reflected on the experience of contributing to the breakthrough.

“Being part of the team that uncovered the enzymes behind spirooxindole compounds has been amazing,” Nguyen adds. “UBC Okanagan’s mentorship and support made this possible, and I’m excited to keep growing as a researcher here in Canada.”

International Collaboration Fuels the Research

The project brought together Dr. Dang’s laboratory at UBC Okanagan and Dr. Satya Nadakuduti’s research group at the University of Florida.

Funding for the work came from Canada’s Natural Sciences and Engineering Research Council’s Alliance International Collaboration program, the Canada Foundation for Innovation, and the Michael Smith Health Research BC Scholar Program. Additional support was provided by the United States Department of Agriculture’s National Institute of Food and Agriculture.

“We are proud of this discovery coming from UBC Okanagan. Plants are fantastic natural chemists,” Dr. Dang says. “Our next steps will focus on adapting their molecular tools to create a wider range of therapeutic compounds.”