July 13, 2015
Scientists discover how opium poppies synthesize morphine
Research opens door to development of alternative painkillers
Many people who live in developing countries do not have access to the pain relief that comes from morphine or other analgesics. That’s because opiates are primarily derived from the opium poppy plant (Papaver somniferum) and are dependent on the plant health and supply around the world.
After years of leading research on the opium poppy, Peter Facchini, professor of biological sciences in the Faculty of Science, Scott Farrow, PhD student and Jill Hagel, research associate, have characterized a novel gene that encodes the gateway enzyme in the formation of morphine. Essentially, they’ve begun to understand how poppies synthesize the pain-killing enzymes. The discovery opens the door to alternative production systems, aside from the plant itself.
Farrow, who is building on the insights Facchini and his team have been gathering over more than 23 years of research into opium poppies, is the lead author of a new paper that describes one of many significant discoveries arising from Facchini’s research program.
The findings were published July 1 in Nature Chemical Biology, and detail the missing step to morphine biosynthesis.
“The gene we’ve isolated actually consists of a natural fusion between two ancestral genes, which encodes the gateway enzyme in the formation of morphine,” says Farrow. “It’s really interesting to see these fused genes in a metabolic pathway. It provides us with a new tool to search for something missing in other plants as well.”
Finding is crucial to developing alternative painkillers
Facchini says the isolation of this gene, among many other things, is a key step toward the reassembly of the pathway to morphine in microorganisms such as yeast.
“These efforts could lead to the development of alternative production systems for painkillers such as morphine, codeine and oxycodone,” says Facchini, an internationally recognized expert on the opium poppy.
“It's satisfying to know that my research has the potential to help people," he says. "But finding the last known step is really just the beginning of a new pathway of inquiry."
Knowing how the genes work key step to reconstructing pathway in other organisms
He likens this discovery to a box of Lego building blocks without a set of instructions — where the blocks are the genes along the pathway. One of the next steps will be to “write the instruction manual” based on still unknown information about how the genes work. This is crucial to reconstructing the pathway in another organism. "You can certainly snap a few pieces together, but you're not going to build a complex toy without a lot of knowledge and skill."
This work was supported by grants from Genome Canada, Genome Alberta, the Government of Alberta, the Canada Foundation for Innovation and the Natural Sciences and Engineering Research Council of Canada. Farrow also received a scholarship from Alberta Innovates Technology Futures.
The care we receive has a huge impact on our health and economy. One of the goals of the University of Calgary’s Infections, Inflammation and Chronic Diseases research priority, is to apply our strengths and future developments to understand, treat and eradicate the development and longevity of chronic diseases. Novel approaches to treatment and prevention are a crucial component of this research strategy.