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Although these mutations occur within the \u03b23-\u03b1C region, how they alter EGFR conformational dynamics and influence the response to the covalent inhibitor afatinib remains incompletely understood. Here, we investigated mutation-dependent changes in EGFR conformational ensembles, dual-mode of afatinib binding, and Cys797-mediated covalent reaction energetics in wild-type, \u0394E746-A750, and L747P kinase domains. We find that both mutations preferentially stabilize active-like kinase conformations but do so through distinct structural mechanisms. The \u0394E746-A750 deletion produces greater P-loop and ATP-pocket conformational heterogeneity, whereas L747P restricts \u03b1C-helix and activation-loop dynamics and more strongly stabilizes the active-like ensemble. Afatinib binding disrupts the K745-E762 interaction and alters the \u03b1C-helix conformation while the pre-formed covalent state samples \u03b1C-out configurations that increase accessibility of an \u03b1C-adjacent pocket that is less accessible in the apo state. Alchemical calculations further reveal mutation- and protonation-state-dependent differences in the conditional noncovalent binding free energy of afatinib. QM\/MM calculations of Cys797-afatinib bond formation reveal mutation-dependent differences in the calculated reaction barrier, with L747P showing a lower barrier than \u0394E746-A750 within the employed QM\/MM model. Together, these results show that EGFR exon 19 mutations reshape the conformational landscape and local structural environment of the kinase, thereby influencing afatinib binding and the energetic environment of covalent bond formation. These findings provide a structural framework for understanding how distinct EGFR mutations can produce different responses to covalent kinase inhibition.<\/jats:p>","DOI":"10.1021\/acs.jpcb.6c03491","type":"journal-article","created":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T05:01:38Z","timestamp":1789102898000},"page":"9776-9791","source":"Crossref","is-referenced-by-count":1,"title":["Mutation-Dependent\nConformational Dynamics and Dual-Mode\nAfatinib Binding in EGFR Exon 19 Variants"],"prefix":"10.1021","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-0765-3315","authenticated-orcid":true,"given":"Kousik K.","family":"Bhanja","sequence":"first","affiliation":[{"name":"Indian Institute of Technology (ISM) Dhanbad , , ,","place":["Dhanbad, India, 826004"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajesh","family":"Ghosh","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology (ISM) Dhanbad , , ,","place":["Dhanbad, India, 826004"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0331-2670","authenticated-orcid":true,"given":"Niladri","family":"Patra","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology (ISM) Dhanbad , , ,","place":["Dhanbad, India, 826004"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,11]]},"reference":[{"issue":"4","key":"2026092408095878800_cit1","doi-asserted-by":"publisher","first-page":"795","DOI":"10.1007\/s10787-020-00698-3","article-title":"Cellular Signalling Pathways Mediating the Pathogenesis of Chronic\nInflammatory Respiratory Diseases: An Update","volume":"28","author":"Mehta","year":"2020","journal-title":"Inflammopharm."},{"issue":"3","key":"2026092408095878800_cit2","doi-asserted-by":"publisher","first-page":"347","DOI":"10.1038\/modpathol.2011.215","article-title":"Molecular\nPathology of Lung Cancer: Key to Personalized Medicine","volume":"25","author":"Cheng","year":"2012","journal-title":"Mod. Pathol."},{"issue":"1","key":"2026092408095878800_cit3","doi-asserted-by":"publisher","first-page":"55","DOI":"10.1007\/s40291-015-0176-x","article-title":"Different EGFR Gene Mutations in Exon 18, 19 and 21\nas Prognostic and Predictive Markers in NSCLC: A Single Institution\nAnalysis","volume":"20","author":"Rossi","year":"2016","journal-title":"Mol. Diagn. Ther."},{"issue":"2","key":"2026092408095878800_cit4","doi-asserted-by":"publisher","first-page":"163","DOI":"10.5858\/arpa.2016-0579-CP","article-title":"Worldwide\nFrequency of Commonly Detected\nEGFR Mutations","volume":"142","author":"Graham","year":"2018","journal-title":"Arch. Pathol. Lab. Med."},{"issue":"1","key":"2026092408095878800_cit5","doi-asserted-by":"publisher","DOI":"10.1002\/cphg.21","article-title":"COSMIC: High-Resolution\nCancer Genetics Using the Catalogue of Somatic Mutations in Cancer","volume":"91","author":"Forbes","year":"2016","journal-title":"CP Human Genet."},{"issue":"1","key":"2026092408095878800_cit6","doi-asserted-by":"publisher","first-page":"6791","DOI":"10.1038\/s41467-022-34398-z","article-title":"Biochemical\nand Structural Basis for Differential Inhibitor Sensitivity of EGFR\nwith Distinct Exon 19 Mutations","volume":"13","author":"Van Alderwerelt Van Rosenburgh","year":"2022","journal-title":"Nat. Commun."},{"issue":"8","key":"2026092408095878800_cit7","doi-asserted-by":"publisher","first-page":"734","DOI":"10.1136\/jclinpath-2014-202313","article-title":"A Cautionary\nLesson on the Use of\nTargeted Methods for EGFR Mutation Analysis: A Case Report","volume":"67","author":"Walsh","year":"2014","journal-title":"J. Clin. Pathol."},{"issue":"7","key":"2026092408095878800_cit8","doi-asserted-by":"publisher","first-page":"946","DOI":"10.1016\/j.jtho.2016.05.008","article-title":"The International\nAssociation for the Study of Lung Cancer Consensus Statement on Optimizing\nManagement of EGFR Mutation\u2013Positive Non\u2013Small Cell\nLung Cancer: Status in 2016","volume":"11","author":"Tan","year":"2016","journal-title":"J. Thorac. Oncol."},{"key":"2026092408095878800_cit9","doi-asserted-by":"publisher","DOI":"10.1158\/1078-0432.22472640.v1","article-title":"Supplementary\nData\nfrom The EGFR Exon 19 Mutant L747-A750&gt;P Exhibits Distinct Sensitivity\nto Tyrosine Kinase Inhibitors in Lung Adenocarcinoma","author":"Truini","year":"2019","journal-title":"Am. Ass. Cancer Res."},{"issue":"1","key":"2026092408095878800_cit10","doi-asserted-by":"publisher","first-page":"32","DOI":"10.1038\/s41698-021-00170-7","article-title":"Microsecond-Timescale\nMD Simulation of EGFR Minor Mutation Predicts the Structural Flexibility\nof EGFR Kinase Core That Reflects EGFR Inhibitor Sensitivity","volume":"5","author":"Yoshizawa","year":"2021","journal-title":"npj Precis. Oncol."},{"issue":"13","key":"2026092408095878800_cit11","doi-asserted-by":"publisher","first-page":"3908","DOI":"10.1158\/1078-0432.CCR-06-0462","article-title":"Exon 19\nDeletion Mutations of Epidermal\nGrowth Factor Receptor Are Associated with Prolonged Survival in Non\u2013Small\nCell Lung Cancer Patients Treated with Gefitinib or Erlotinib","volume":"12","author":"Jackman","year":"2006","journal-title":"Clin. Cancer Res."},{"issue":"4","key":"2026092408095878800_cit12","doi-asserted-by":"publisher","first-page":"385","DOI":"10.1097\/COC.0000000000000282","article-title":"EGFR Exon 19 Deletion\nIs Associated\nWith Favorable Overall Survival After First-Line Gefitinib Therapy\nin Advanced Non\u2013Small Cell Lung Cancer Patients","volume":"41","author":"Choi","year":"2018","journal-title":"Am. J. Clin. Oncol."},{"issue":"2","key":"2026092408095878800_cit13","doi-asserted-by":"publisher","first-page":"189","DOI":"10.1097\/JTO.0000000000000048","article-title":"Effectiveness\nof Gefitinib against Non\u2013Small-Cell Lung Cancer with the Uncommon\nEGFR Mutations G719X and L861Q","volume":"9","author":"Watanabe","year":"2014","journal-title":"J. Thorac. Oncol."},{"issue":"6","key":"2026092408095878800_cit14","doi-asserted-by":"publisher","first-page":"745","DOI":"10.1111\/1759-7714.12637","article-title":"Non-small Cell Lung\nCancer Harboring a Rare EGFR L747P Mutation Showing\nIntrinsic Resistance to Both Gefitinib and Osimertinib (AZD9291):\nA Case Report","volume":"9","author":"Huang","year":"2018","journal-title":"Thorac. Cancer"},{"key":"2026092408095878800_cit15","doi-asserted-by":"publisher","first-page":"102255","DOI":"10.1016\/j.rmcr.2025.102255","article-title":"Case of a Rare EGFR\nMutation L747P Identified Using the Lung Cancer Compact PanelTM Leading to Successful Afatinib Treatment","volume":"57","author":"Sumitani","year":"2025","journal-title":"Respir. Med. Case Rep."},{"key":"2026092408095878800_cit16","doi-asserted-by":"publisher","first-page":"103","DOI":"10.1016\/j.lungcan.2019.05.019","article-title":"Afatinib Is Effective\nin the Treatment of Lung Adenocarcinoma with Uncommon EGFR p.L747P\nand p.L747S Mutations","volume":"133","author":"Liang","year":"2019","journal-title":"Lung Cancer"},{"issue":"10","key":"2026092408095878800_cit17","doi-asserted-by":"publisher","first-page":"2013","DOI":"10.1016\/j.cellsig.2007.06.023","article-title":"Mechanisms for Oncogenic Activation\nof the Epidermal\nGrowth Factor Receptor","volume":"19","author":"Zandi","year":"2007","journal-title":"Cell. 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U.S.A."},{"issue":"1","key":"2026092408095878800_cit27","doi-asserted-by":"publisher","first-page":"15604","DOI":"10.1038\/s41598-017-10697-0","article-title":"Millisecond\nDynamics of BTK Reveal Kinome-Wide Conformational Plasticity within\nthe Apo Kinase Domain","volume":"7","author":"Sultan","year":"2017","journal-title":"Sci. Rep."},{"issue":"11","key":"2026092408095878800_cit28","doi-asserted-by":"publisher","first-page":"7260","DOI":"10.1021\/acs.jctc.1c00505","article-title":"Activation of Abl1 Kinase Explored\nUsing Well-Tempered\nMetadynamics Simulations on an Essential Dynamics Sampled Path","volume":"17","author":"Oruganti","year":"2021","journal-title":"J. Chem. Theory Comput."},{"issue":"6","key":"2026092408095878800_cit29","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pcbi.1002555","article-title":"Minimum Free Energy Path of Ligand-Induced\nTransition\nin Adenylate Kinase","volume":"8","author":"Matsunaga","year":"2012","journal-title":"PLoS Comput. Biol."},{"issue":"13","key":"2026092408095878800_cit30","doi-asserted-by":"publisher","first-page":"4147","DOI":"10.1021\/acs.jcim.3c00429","article-title":"Molecular\nInsights on the Conformational\nTransitions and Activity Regulation of the C-Met Kinase Induced by\nLigand Binding","volume":"63","author":"Liu","year":"2023","journal-title":"J. Chem. Inf. Model."},{"issue":"4","key":"2026092408095878800_cit31","doi-asserted-by":"publisher","first-page":"2066","DOI":"10.1021\/acs.jctc.5b01221","article-title":"Molecular Dynamics\nAnalysis of Binding of Kinase Inhibitors to WT EGFR and the T790M\nMutant","volume":"12","author":"Park","year":"2016","journal-title":"J. Chem. Theory Comput."},{"issue":"7","key":"2026092408095878800_cit32","doi-asserted-by":"publisher","first-page":"837","DOI":"10.1016\/j.chembiol.2016.05.017","article-title":"Molecular Basis\nfor Redox Activation of Epidermal Growth\nFactor Receptor Kinase","volume":"23","author":"Truong","year":"2016","journal-title":"Cell Chem. Biol."},{"issue":"2","key":"2026092408095878800_cit33","doi-asserted-by":"publisher","first-page":"1525","DOI":"10.1021\/acs.jmedchem.1c01186","article-title":"Reactivities of the\nFront Pocket N-Terminal Cap Cysteines in Human Kinases","volume":"65","author":"Liu","year":"2022","journal-title":"J. Med. Chem."},{"issue":"9","key":"2026092408095878800_cit34","doi-asserted-by":"publisher","first-page":"1935","DOI":"10.1021\/acs.jcim.8b00454","article-title":"How Reactive Are Druggable Cysteines\nin Protein Kinases?","volume":"58","author":"Awoonor-Williams","year":"2018","journal-title":"J. Chem. Inf. 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