Scientists Decode How Tobacco Produces Nicotine After 200 Years of Mystery

A collaborative scientific team from Britain and Denmark has uncovered the biochemical mechanism and specific genes responsible for nicotine synthesis in tobacco plants, resolving a mystery that has persisted for over 200 years. This breakthrough opens revolutionary possibilities in the field of plant molecular farming and pharmaceutical production.

Humans have consumed tobacco for thousands of years. Although nicotine was first isolated in the late 1820s, the exact process by which tobacco plants produce nicotine remained unclear until now.

The recent study, published on The Conversation platform and reported by the scientific journal Nature, involved researchers from the University of York in the UK and the University of Copenhagen in Denmark. They successfully identified the genes and enzymes that govern nicotine biosynthesis.

Biological Trick Behind Nicotine Production

Biologist Benjamin Leitch explained that the difficulty in deciphering the process stemmed from a unique biological "trick." Initially, a glucose molecule attaches to the nicotine building blocks, activating them and enabling the molecule's assembly. Once the assembly is complete, the glucose molecule detaches entirely and disappears without leaving any trace.

The scientists pinpointed two key enzymes, NaGR and NicGS, which facilitate the assembly of nicotine from raw materials—specifically, an amino acid involved in protein construction and a vitamin-like compound.

Implications for Biotechnology and Drug Production

The practical significance of this discovery lies in advancing biotechnology tools. The plant Nicotiana benthamiana, closely related to tobacco, is currently employed in molecular farming to produce life-saving drugs and vaccines. However, the presence of naturally occurring, highly addictive nicotine contaminates these products and necessitates complicated and costly removal processes.

With the new insights, scientists will be able to genetically engineer the plant to completely halt nicotine production or redirect its complex biosynthetic system to generate beneficial pharmaceutical compounds. This transformation could convert tobacco from a source of smoking and cigarettes into a sustainable bioreactor for drug manufacturing.