LAUSR

Nanoparticles (NPs) are increasingly being developed as biomedical platforms for drug/nucleic acid delivery and imaging. However, in biological fluids, NPs interact with a wide range of proteins that form a coating known as protein corona. Coronae can critically influence self‐interaction and binding of other molecules, which can affect toxicity, promote cell activation, and inhibit general or specific cellular uptake. Glycosaminoglycan (GAG)‐binding enhanced transduction (GET) is developed to efficiently deliver a variety of cargoes intracellularly; employing GAG‐binding peptides, which promote cell targeting, and cell penetrating peptides (CPPs) which enhance endocytotic cell internalization. Herein, it is demonstrated that GET peptide coatings can mediate sustained intracellular transduction of magnetic NPs (MNPs), even in the presence of serum or plasma. NP colloidal stability, physicochemical properties, toxicity and cellular uptake are investigated. Using label‐free snapshot proteomics, time‐resolved profiles of human plasma coronas formed on functionalized GET‐MNPs demonstrate that coronae quickly form (<1 min), with their composition relatively stable but evolving. Importantly GET‐MNPs present a subtly different corona composition to MNPs alone, consistent with GAG‐binding activities. Understanding how NPs interact with biological systems and can retain enhanced intracellular transduction will facilitate novel drug delivery approaches for cell‐type specific targeting of new nanomaterials.