E Bacterial two-hybrid assayreveals an interaction between SiaC and SiaA PP2C-like domain. NA represents the empty vector pBT or pTRG. The recombinant strains harboring different proteins were separately streaked on nonselective and dual-selective media (3-amino-1, 2, 4- triazole + streptomycin). The strain expressing LGF2 and Gal11P were used as positive controls. 