Abstract: The present invention relates to methods modifying cell surface markers of red blood cells (RBCs) and uses of the same. In particular, the method comprises contacting an RBC with a peptide in the presence of a ligase, under suitable conditions and for sufficient time to allow ligation of the peptide to the RBC to form an RBC-peptide conjugate. In one embodiment, the ligase is OaAEPI ligase. The RBC-peptide conjugate may be further contacted with an effector molecule under suitable conditions and for sufficient time for conjugation of the effector molecule to the RBC-peptide to form an RBC-peptide-effector molecule conjugate.

Abstract: The invention relates to surface modified extracellular vesicles, wherein the extracellular vesicles comprise an exogenous polypeptide tag that is covalently linked to a membrane protein of the extracellular vesicles. In a particular embodiment, the tag is covalently linked to the membrane protein of microvesicles by sortase-mediated ligation. Methods of preparing said extracellular vesicles and methods of using said extracellular vesicles loaded with therapeutic molecules for treating a disease are also disclosed herein.