plasmids for bacterial two-hybrid analysis were constructed as follows. the divIVA gene product generated using the primers pdivIVA1 and pdivIVA2 was digested with BamHI and EcoRI and cloned between the BamHI and EcoRI sites of the ''target'' plasmid,pTRG, generating plasmid pHL172. the gycosyl transferase-encoding fragment of cslAsc was amplified by PCR using the primers pcslAsc3 and pcslAsc4. the product was digested with BamHI and EcoRI and cloned between the same sites of the''bait'' plasmid,pBT,giving pHL173.