Most life relies on a predictable set of primary elements, but microbes and marine organisms occasionally deviate, weaving boron, fluorine, selenium, iodine, vanadium, or molybdenum into their molecular structures. These atypical atoms grant metabolites distinct reactive properties that conventional biochemistry cannot easily replicate. By altering lipophilicity or boosting redox activity, these compounds enable specialized functions ranging from detoxification and signaling to potent antimicrobial defense.

Professor Seoung Rak Lee of the Pusan National University College of Pharmacy led a comprehensive review published in Natural Product Reports, cataloging these discoveries from 1944 to 2025. The study details how organisms overcome the energetic hurdles of incorporating these rare elements. For instance, fluorine enters through specialized carbon-fluorine bond formation, while arsenic is often integrated via SAM-dependent methylation. These processes yield diverse compounds, such as the antibacterial boromycin or the antioxidant selenoneine.

Beyond their biological roles, these metabolites represent a frontier for synthetic biology. The team suggests that by decoding the enzymatic foundations of these transformations, researchers can engineer new biocatalysts and therapeutic agents. Advances in cryo-EM, machine learning, and metagenomics are expected to accelerate this discovery process, turning nature’s chemical anomalies into tools for sustainable manufacturing and medical innovation.