A renal cortex targeting elastin-like polypeptide (ELP), a renal medulla and cortex targeting ELP, and a method of treating a renal disorder are provided. The renal cortex targeting ELP includes up to 95 repeat units having the sequence VPGXG (SEQ ID NO: 1), where X in each of the repeat units is any amino acid except proline. The renal medulla and cortex targeting ELP includes at least 95 repeat units of SEQ ID NO: 1, where X in each of the repeat units is any amino acid except proline. The method of treating a renal disorder includes administering an ELP and a therapeutic drug to a subject in need thereof, where the ELP includes up to 671 repeat units of SEQ ID NO: 1 and X in each of the repeat units is any amino acid except proline.
