CTXphi_pIII-N1 is the N-terminal domain, N1, of the pIII protein of the CTXphi bacteriophage of Vibrio cholerae. CTXphi is a ssDNA Inovirus. pIII is a minor coat protein. This domain interacts directly with the C-terminus of TolA, a periplasmic protein of Vibrio cholerae itself as part of the infection mechanism [1].

1: Crystal structures of a CTXphi pIII domain unbound and in complex with a Vibrio cholerae TolA domain reveal novel interaction interfaces. Ford CG, Kolappan S, Phan HT, Waldor MK, Winther-Larsen HC, Craig L; J Biol Chem. 2012;287:36258-36272. PMID:22942280