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Transgultaminase-Mediated Nanoarmoring of Enzymes by PEGylation.

PEGylation, the covalent attachment of polyethylene glycol to bioactive molecules, is one of the leading approaches used to prolong pharmacokinetics, to improve the stability, and to reduce the immunogenicity of therapeutic proteins. PEG-conjugated products are associated with better therapy outcomes and improved patient compliance. Widely applied in clinical practice, the technology is mainly used to modify proteins, peptides, and oligonucleotides but also other drug delivery systems such as the liposomal one. Undergoing continuous attempts to optimize therapeutic efficacy and to tune the formation of conjugates, a number of different PEGylation processes are now available to researchers for protein conjugation. Although the possibility of obtaining highly homogeneous conjugate mixtures, preferably formed by a single monoconjugate, from a chemical conjugation reaction continues to be limited, several enzymatic conjugation approaches have recently been investigated to address this need. PEGylation mediated by microbial transglutaminase and its many advantages and modifications are outlined in detail in the current work permitting interested readers to perform site-specific protein derivatization to glutamines or lysines.

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