Fluorinated Amino Acids in Protein Engineering

Fluorinated amino acids have become indispensable tools in the design and optimisation of proteins for research and therapeutic applications. By introducing one or more fluorine atoms into naturally occurring or synthetic amino acid residues, researchers exploit the unique combination of fluorine’s small van der Waals radius and high electronegativity to modulate side-chain polarity, conformational preferences and hydrogen-bonding patterns. Such modifications can profoundly alter protein folding, stability and interaction with biological targets, offering routes to enhanced resistance to proteolysis, improved pharmacokinetics and precise conformational control. In addition, the presence of ^19F nuclei enables sensitive spectroscopic interrogation by fluorine NMR, while radio-isotopic fluorine labels facilitate positron emission tomography. Advances in chemical synthesis, genetic code expansion and late-stage selective modification have together expanded the repertoire of accessible fluorinated residues—from mono-fluorinated analogues of tryptophan and phenylalanine to multi-fluorinated aliphatic and aromatic side chains—and have brought about innovative bioconjugation strategies for site-specific labelling. Collectively, these developments underscore the global significance of fluorinated amino acids as both mechanistic probes and practical engineering elements in protein science and biotechnology.

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Fluorinated Amino Acids in Protein Engineering publication trend

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Technical terms

Fluorinated amino acid: An amino acid analogue in which one or more hydrogen atoms have been replaced by fluorine, altering physicochemical properties and spectroscopic behaviour.

^19F NMR: Nuclear magnetic resonance spectroscopy that detects the fluorine-19 nucleus, used to probe structure and dynamics in fluorinated biomolecules.

O-fluoroalkylation: A chemical reaction that installs a fluoroalkyl group onto an oxygen atom, typically of a phenolic side chain, to introduce functional handles.

Genetic code expansion: A methodology allowing the incorporation of non-canonical amino acids into proteins during translation through engineered tRNA-synthetase pairs.

Bioconjugation: The covalent linking of biomolecules (such as proteins or peptides) to functional moieties (labels, drugs or polymers) to impart new properties or enable detection.

References

1. Late-stage gem -difluoroallylation of phenol in bioactive molecules and peptides with 3,3-difluoroallyl sulfonium salts. Chemical Science (2024).
2. Tinker, Tailor, Soldier, Spy: The Diverse Roles That Fluorine Can Play within Amino Acid Side Chains. Molecules (2023).
3. Characterization of conformational states of the homodimeric enzyme fluoroacetate dehalogenase by 19 F– 13 C two-dimensional NMR. RSC Chemical Biology (2024).