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FMM is a minimal media that contain 1% fructose in substitution of glucose to determine the ability of fungal strains to utilize fructose as a sole carbon source. Mutant and reconstituted strains were generated by standard fungal protoplast transformation of A. fumigatus uracil auxotroph strain CEA17. PCR generated gene replacement or reconstitution constructs were utilized. blast searches of the http://www.selleckchem.com/products/BKM-120.html A1163 genome sequence at The Central Aspergillus Data REpository database retrieved the orlA open reading frame (AFUB_043350; Mabey et?al., 2004). The 2999?bp orlA gene was replaced by a gene replacement construct of approximately 5?kb. The replacement construct was generated by cloning homologous sequences (900?bp upstream and 951?bp downstream) of the orlA locus into plasmid pJW24 (gift from Dr Nancy Keller) flanking the A. parasiticus pyrG gene (d'Enfert, 1996). This plasmid was then used as a template to amplify the replacement cassette and 10??g of this PCR product was used for protoplast transformation. Polyethylene glycol mediated protoplast transformation was essentially performed according to the procedure described by Yelton et?al. (1984). To reconstitute the wild-type orlA gene back into the orlA mutant background, a reconstitution construct was generated by cloning an approximate 5.3?kb fragment of orlA from the wild-type strain CEA10 into fungal transformation vector pBC-Hygro (gift from Kevin McCluskey, Fungal Genetics Stock Center), which contains the hygromycin B resistance gene as a selectable marker; 1187?bp of sequence upstream of the orlA coding sequence and 775?bp downsteam of the coding sequence were utilized. Subsequent transformants were selected on hygromycin B (150??g?ml?1) containing media. Transformants were initially screened with PCR to identify potential transformants with homologous recombination events at the orlA locus. PCR positive transformants were single spore isolated to eliminate any potential heterokaryons. Finally, all possible candidates were then verified by Southern blot analysis and a strain carrying a single insertion of the replacement construct at the orlA gene locus was selected for further characterization. For reconstitution transformations, hygromycin resistant colonies were selected and screened with PCR and Southern blot analysis to identify a transformant with a single ectopic insertion of the reconstitution construct. Real-time reverse transcriptase PCR was used to confirm expression of the re-introduced gene (Cramer et?al., 2006). Equal amounts of conidia from the respective strains (1?��?103) were plated on two different media, GMM and SMM, and incubated at 37��C for 4 days before harvesting and counting. Total conidia production was assessed in triplicate and repeated on three separate occasions. Average value and standard deviation are reported with a two-tailed Student's t-test analysis (P?