title: Transcriptional responses of the Bdtf1-deletion mutant to the phytoalexin brassinin in the necrotrophic fungus Alternaria brassicicola.
abstract: Brassica species produce the antifungal indolyl compounds brassinin and its derivatives, during microbial infection. The fungal pathogen Alternaria brassicicola detoxifies brassinin and possibly its derivatives. This ability is an important property for the successful infection of brassicaceous plants. Previously, we identified a transcription factor, Bdtf1, essential for the detoxification of brassinin and full virulence. To discover genes that encode putative brassinin-digesting enzymes, we compared gene expression profiles between a mutant strain of the transcription factor and wild-type A. brassicicola under two different experimental conditions. A total of 170 and 388 genes were expressed at higher levels in the mutants than the wild type during the infection of host plants and saprophytic growth in the presence of brassinin, respectively. In contrast, 93 and 560 genes were expressed, respectively, at lower levels in the mutant than the wild type under the two conditions. Fifteen of these genes were expressed at lower levels in the mutant than in the wild type under both conditions. These genes were assumed to be important for the detoxification of brassinin and included Bdtf1 and 10 putative enzymes. This list of genes provides a resource for the discovery of enzyme-coding genes important in the chemical modification of brassinin.
authors: Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, Korea. yangraec@kribb.re.kr.
authors: Yangrae
authors: Y
authors: Cho
authors: Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek 94598, CA, USA. raohm@lbl.gov.
authors: Robin A
authors: RA
authors: Ohm
authors: Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, Korea.
authors: Rakshit
authors: R
authors: Devappa
authors: Division of Applied Bioscience and Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Buk-Gu, Gwangju 500-757, Korea. hblee@chonnam.ac.kr.
authors: Hyang Burm
authors: HB
authors: Lee
authors: Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek 94598, CA, USA. ivgrigoriev@lbl.gov.
authors: Igor V
authors: IV
authors: Grigoriev
authors: Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, Korea. botaekim61@gmail.com.
authors: Bo Yeon
authors: BY
authors: Kim
authors: Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, Korea. jsahn@kribb.re.kr.
authors: Jong Seog
authors: JS
authors: Ahn
mesh_terms: D000528:Alternaria / Q000187:drug effects* / Q000235:genetics*; D001937:Brassica / Q000378:metabolism / Q000382:microbiology; D016000:Cluster Analysis; D017353:Gene Deletion; D020869:Gene Expression Profiling; D015966:Gene Expression Regulation, Fungal; D054884:Host-Pathogen Interactions; D007211:Indoles / Q000494:pharmacology*; D012717:Sesquiterpenes / Q000494:pharmacology*; D013859:Thiocarbamates / Q000494:pharmacology*; D014158:Transcription, Genetic / Q000187:drug effects*; D000094162:Phytoalexins
chemical_list: D007211:Indoles; D012717:Sesquiterpenes; D013859:Thiocarbamates; C089020:brassinin; D000094162:Phytoalexins