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Here we show that site-specific incorporation of 2,3,4,5,6-pentafluoro-l-phenylalanine (F5Phe) reshapes the torsional energy landscape of aromatic side chains, slowing ring flips by over 2 orders of magnitude and shifting them into the slow-exchange regime accessible by 19F NMR. F5Phe can be genetically encoded with high fidelity and minimal structural perturbation, as confirmed by high-resolution X-ray crystallography across multiple proteins. The resulting 19F NMR spectra enable direct, quantitative measurements of ring-flip kinetics without the need for isotope labeling or complex multidimensional experiments. Application to a diverse set of proteins demonstrates that ring-flip rates vary widely even within the same hydrophobic cluster, revealing highly localized conformational fluctuations rather than global unfolding events. Pressure-dependent measurements yield small activation volumes, indicating that the structural rearrangements enabling ring flips are spatially confined. Ligand binding and protein\u2013protein interactions modulate ring-flip rates in a site-specific manner, providing a sensitive readout of allosteric effects on local protein malleability. These results establish fluorinated aromatic amino acids as a general chemical strategy to engineer dynamic observables in proteins, transforming aromatic ring flips into a broadly applicable probe of local conformational dynamics and allostery.<\/jats:p>","DOI":"10.1021\/jacs.6c10121","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T04:58:10Z","timestamp":1785128290000},"page":"32644-32655","source":"Crossref","is-referenced-by-count":2,"title":["Genetically Encoded\nPentafluorophenylalanine Enables\nQuantitative Probing of Local Protein Malleability by 19F NMR"],"prefix":"10.1021","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-6370-3196","authenticated-orcid":true,"given":"Nathan","family":"Paul","sequence":"first","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adarshi P.","family":"Welegedara","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0071-9018","authenticated-orcid":true,"given":"Rebecca L.","family":"Frkic","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luca","family":"Macri","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-1746-4685","authenticated-orcid":true,"given":"Toby R. C.","family":"Thompson","sequence":"additional","affiliation":[{"name":"The University of Manchester , , ,","place":["Manchester, U.K., M13 9PL"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James L.","family":"Baber","sequence":"additional","affiliation":[{"name":"NIH , , , ,","place":["Bethesda, Maryland, United States, 20892-0520"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-9215-8225","authenticated-orcid":true,"given":"Edan","family":"Habel","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5388-3949","authenticated-orcid":true,"given":"Elwy H.","family":"Abdelkader","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7546-4411","authenticated-orcid":true,"given":"Haocheng","family":"Qianzhu","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8604-0171","authenticated-orcid":true,"given":"Nicholas F.","family":"Chilton","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]},{"name":"The University of Manchester , , ,","place":["Manchester, U.K., M13 9PL"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6150-3822","authenticated-orcid":true,"given":"Colin J.","family":"Jackson","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9809-5700","authenticated-orcid":true,"given":"Ad","family":"Bax","sequence":"additional","affiliation":[{"name":"NIH , , , ,","place":["Bethesda, Maryland, United States, 20892-0520"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3680-8699","authenticated-orcid":true,"given":"Thomas","family":"Huber","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0563-0146","authenticated-orcid":true,"given":"Gottfried","family":"Otting","sequence":"additional","affiliation":[{"name":"The Australian National University , , , ,","place":["Canberra, Australian Capital Territory, Australia, 2601"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,24]]},"reference":[{"key":"2026080511113799600_cit1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1006\/jmbi.1998.1843","article-title":"Anatomy of hot spots in protein interfaces","volume":"280","author":"Bogan","year":"1998","journal-title":"J. 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