Protein - active agent conjugate and preparation method

The present invention provides a protein having an amino acid motif isoprenoid transferase can be identified - active agent conjugates. The present invention also provides a composition comprising conjugates, and methods for preparing conjugates and compositions used. The present invention further provides methods of using the conjugate of an active agent delivered to the target cell, and methods of using the conjugate to an individual (e.g., a subject active agent required) in need of treatment for treatment.