Replication protein 229 Reading frame A REPX_STAAU Protein rep Produces a single-strand nick in a specific site of the plasmid, and this nick results in single-strand replication by rolling circle mechanism. MCYNMEKYTEKKQRNQVFQKFIKRHIGENQMDLVEDCNTFLSFVADKTLEKQKLYKANSCKNRFCPVCAWRKARKDALGLSLMMQYIKQQEKKEFIFLTLTTPNVMSDELENEIKRYNNSFRKLIKRKKVGSVIKGYVRKLEITYNKKRDDYNPHFHVLIAVNKSYFTDKRYYISQQEWLDLWRDVTGISEITQVQVQKIRQNNNKELYEMAKYSGKDSDYLINKSKSL