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Wider application is hindered by lack of atomic level understanding of protein\u2010PEG interactions, preventing design of conjugates with predicted properties. We deployed an integrative structural and biophysical approach to address this critical challenge with the PEGylated carbohydrate recognition domain of human galectin\u20103 (Gal3C), a lectin essential for cell adhesion and potential biologic. PEGylation dramatically increased Gal3C thermal stability, forming a stable intermediate and redirecting its unfolding pathway. Structural details revealed by NMR pointed to a potential role of PEG localization facilitated by charged residues. Replacing these residues subtly altered the protein\u2010PEG interface and thermal unfolding behavior, providing insight into rationally designing conjugates while preserving PEGylation benefits.<\/jats:p>","DOI":"10.1002\/anie.202203784","type":"journal-article","created":{"date-parts":[[2022,8,4]],"date-time":"2022-08-04T02:20:32Z","timestamp":1659579632000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Atomic\u2010Scale View of Protein\u2010PEG Interactions that Redirect the Thermal Unfolding Pathway of PEGylated Human Galectin\u20103"],"prefix":"10.1002","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7920-2021","authenticated-orcid":false,"given":"Amanda","family":"Pritzlaff","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Florida  Gainesville FL 32611 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