The interaction of the RSA site and the pre protein may not only serve a function in plasmid maintenance, but also contribute to the distribution of small antibiotic resistance plasmids among Gram-positive bacteria. mob Mobilization protein MSFAVARMTKLKADNLVGIGNHDQRKTTNHSNEDIDVSRSHLNYDLVAGRTDNFKTDIEAYINENKASKRAVRKDAVLVNEWIITSDKDFFEQLDEAETRKYFETAKQYFADNYGDENIRYAVVHMDEKTPHMHMGIVPFDDDKKLSAKRIFNREALQHIQEELPQYLKENGFDVQRGNKNKERKNLSVPEYKAMREELKKIETEKQETQAKLADTKKQLDEIKPRDTKKIASKPTLMNKNKVTVDKSDLADLEQRAVTSDAYNFEKIHLEVGNHSLRNDLSEAKGRNYELRKENERLQKLVGTLQGIIRNVDEFLHKKLGINLPEKWLERAGLKEPSKKAPESSQELDRHKSDELGGPHL preA Plasmid recombination enzyme 361 PREA_LACPL