Disclosed herein are engineered, non-naturally occurring
protein variants with de novo
glycosylation sites having wildtype-like
biological activity of wildtype
interferon beta. Also disclosed herein are vectors encoding the non-naturally occurring
protein variants described herein. Also disclosed herein are pharmaceutical compositions comprising the non-naturally occurring
protein variants described herein or a vector encoding the non-naturally occurring protein variants described herein. Also disclosed herein are methods of treating a
disease by administering to a subject the non-naturally occurring protein variants described herein, a vector encoding the non-naturally occurring protein variants described herein, or a pharmaceutical composition comprising the non-naturally occurring protein variants described herein or a vector described herein.