, 2012). To generate a bait construct with the peptide AC domain without the signal sequence (Asn27–Cys211) of EtROM3 (GenBank DQ323509), the cDNA was amplified by PCR (sense 5′-CCGGAATTCAACATTTCACTGGACAAGTCG-3′, antisense 5′-CGGGATCCACACGTTACTGCGAACCCGCA–3′) from E. tenella cDNA ( Zheng et al., 2011), and inserted into the EcoRI–BamHI site of pGBKT7. The cDNAs encoding cleavage site VA domain (Val462–Ala675) of EtMIC1 (GenBank EU093966) and GG domain (Glu2175–Gln2340) of EtMIC4 (GenBank AJ306453) were ligated into the EcoRI–BamHI site of pGADT7 (EtMIC1-VA: sense 5′-C GGAATTCGTTGGTGATTGGGAAGACTGGGGGC-3′,

antisense 5′-CGCGGATCCT GCCCACATCTCTGATTGTTCACC-3′; EtMIC4-GG: sense 5′-CGGAATTCGAAGGC GAGACAGGGAAACCTGG-3′, antisense 5′-CGCGGATCCCTACTGGATGTCACCA

CHIR-99021 in vivo CTGTCTGCC-3′). The recombinant vector sequences were confirmed by Sangon Biotech (Shanghai). AH109 yeasts were transformed with 1 μg of the following plasmids: pGBKT7-ROM3, positive ABT263 control pCL1, and negative control pGBKT7, respectively. Co-transformations were performed with pGBKT7-ROM3 and pGADT7-MIC1, pGBKT7-ROM3 and pGADT7-MIC4, pGBKT7-53 and pGADT7-T, pGBKT7-Lam and pGADT7-T. Yeast cells from a single transformation of DNA binding domain constructs were spread on SD/-Leu plates and SD/-Leu/-His plates. All co-transformed yeasts were plated on SD/-Trp/-Leu plates and SD plates lacking tryptophan, leucine, histidine HCl monohydrate and adenine hemisulfate salt (SD/-Trp/-His/-Leu/-Ade). The activation of transformants was detected by the filter assay for β-galactosidase activity. For Western found blot analysis, positive single colony was picked from SD/-Trp/-Leu plates, cultured in SD liquid medium lacking tryptophan and leucine at 30 °C with rotation at 250 rpm until OD600 > 1.0. The yeast cells were pelleted and lysed by votexing with glass beads (0.5 mm in diameter, Sigma) at 4 °C in 200 μL of cell lysis buffer with freshly added protease inhibitors. Twenty micrograms of each sample was run on SDS-PAGE and electroblotted onto Protran

nitrocellulose membrane (Whatmann, UK). Anti-c-Myc monoclonal antibody (1:500) and anti-HA polyclonal antibody (1:1000) (Santa Cruz, CA) was used for Western blot analysis. AC domain of EtROM3 was subcloned into pcDNA3.1-Myc and GG domain of EtMIC4 was subcloned into pcDNA3.1-HA. All constructs were confirmed by DNA sequencing. Hela cells were cultured in DMEM plus 10% FBS and glutamine in 6-well plate at a density of 3 × 105/well. After 24 h, cells were transformed with recombinant plasmids pcDNA-Myc-ROM3, pcDNA-HA-MIC4, pcDNA-Myc-ROM3 and pcDNA-HA-MIC4 using Lipofectamine 2000 (Invitrogen) as described (Pascall et al., 2002). Forty-eight hours after transfections, Hela cells were harvested and lysed on ice in lysis buffer for 20 min (20 mmol/L Tris–HCl (pH 7.4), 150 mmol/L NaCl, 0.5% NP-40, supplemented with a protease inhibitor cocktail from Roche).