, 1989; Brouard et al., 1998). These fragments were purified and fused together in a second PCR step. The fusion product was subsequently amplified. The PCR products were separated and purified before ligation into the previously Selleck Epacadostat described pESC-α vector (Jeon et al., 2009), resulting in pESC-α-cCelE. For expression of genes, pADHα (Fig. 2), which was designed to consist of the alcohol dehydrogenase 1 (ADH1) promoter and the previously described α-mating factor gene (Jeon et al., 2009), was used as a vector. The ADH1 promoter and α-mating factor gene from S. cerevisiae were linked by a multistep PCR strategy using pairs of overlapping primers as described above: ADHα P1,

ADHα P2, ADHα P3, and ADHα P4 (Table 1). The PCR products were separated and purified before ligation into the pESC-TRP vector (Clontech Laboratories Inc.), resulting in the pADHα vector (Fig. 2). For construction of chimeric CelE-doc and Bgl1 expressing vectors, the chimeric CelE-doc gene was amplified by PCR with the pESC-α-cCelE plasmid as a template and the primers cCelE P1 and cCelE P4, and the Bgl1 gene was amplified by PCR using the previously described pαBG1 plasmid (Jeon et al., 2009) as a template PD0332991 price and the primers Bgl1_f and Bgl1_r. The fragments were inserted into the NotI–SpeI site of the pADHα vector. The resulting plasmids were named pADH-α-cCelE and pADH-α-Bgl1 (Fig. 2). The mini-CbpA was designed to consist of a CBD, a hydrophilic domain, and

two cohesins of scaffolding protein CbpA (Shoseyov et al., 1992) (Fig. 1b). The mini-CbpA gene was amplified using genomic DNA from C. cellulovorans as a template and the primers mCbpA_f and mCbpA_r. The PCR primers were designed to allow in-frame fusion at the N-terminal 2-hydroxyphytanoyl-CoA lyase end of mini-CbpA with the α-mating factor and at the C-terminal end with the FLAG tag from the pADHα vector. The amplified fragment was inserted into the NotI–SpeI site of the pADHα vector. The resulting plasmid was named pADH-α-mCbpA (Fig. 2). The plasmid pADHαcCelEmCbpA, used for simultaneous production of chimeric CelE-doc and mini-CbpA, was constructed as follows: a gene carrying the chimeric CelE-doc

cassette, which consisted of the ADH1 promoter, α-mating factor, chimeric CelE-doc gene, FLAG tag, and ADH1 terminator, was amplified by PCR using the pADH-α-cCelE plasmid as a template, and the primers cCelEcas_f and cCelEcas_r. The amplified chimeric CelE-doc expression cassette was digested with XhoI and SalI and inserted into the XhoI–SalI site of the pADH-α-mCbpA plasmid; the resulting plasmid was called pADHαcCelEmCbpA (Fig. 2). Transformation of S. cerevisiae with the constructed plasmids was carried out using the lithium acetate method with the Yeastmaker yeast transformation system (Clontech Laboratories Inc.). Plasmids were introduced into S. cerevisiae YPH499. The transformed clones were selected on SD plates without l-tryptophan. For inoculum preparations, yeast strains were cultivated at 30 °C with shaking at 200 r.p.m.