title: Analysis of expressed sequence tags from the anamorphic basidiomycetous yeast, Pseudozyma antarctica, which produces glycolipid biosurfactants, mannosylerythritol lipids.
abstract: Pseudozyma antarctica T-34 secretes a large amount of biosurfactants (BS), mannosylerythritol lipids (MEL), from different carbon sources such as hydrocarbons and vegetable oils. The detailed biosynthetic pathway of MEL remained unknown due to lack of genetic information on the anamorphic basidiomycetous yeasts, including the genus Pseudozyma. Here, in order to obtain genetic information on P. antarctica T-34, we constructed a cDNA library from yeast cells producing MEL from soybean oil and identified the genes expressed through the creation of an expressed sequence tags (EST) library. We generated 398 ESTs, assembled into 146 contiguous sequences. Based upon a BLAST search similarity cut-off of E<or=10(-5), 21.4% of all contigs were orphan, while 78.6% showed similarity to sequences in the protein database; 60.3% of all contiguous sequences shared significant identities to hypothetical protein of Ustilago maydis, which is a smut fungus and BS producer. Based on the gene expression study using real-time reverse transcriptase-PCR, the predicted genes, such as mannosyltranferase and acyltransferase, were demonstrated to be highly involved in MEL biosynthesis in soybean oil-grown cells.
authors.affiliation: Research Institute for Innovations in Sustainable Chemistry, National institute of Advanced Industrial Science and Technology, AIST, Tsukuba Central 5-2, Higashi 1-1, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Tomotake
authors.initials: T
authors.lastname: Morita
authors.forename: Masaaki
authors.initials: M
authors.lastname: Konishi
authors.forename: Tokuma
authors.initials: T
authors.lastname: Fukuoka
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Imura
authors.forename: Dai
authors.initials: D
authors.lastname: Kitamoto
mesh_terms: D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D001487:Basidiomycota / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism*; D020224:Expressed Sequence Tags; D020869:Gene Expression Profiling; D015723:Gene Library; D006017:Glycolipids / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D008364:Mannosyltransferases / Q000235:genetics / Q000378:metabolism; D012331:RNA, Fungal / Q000737:chemistry / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA
chemical_list: D006017:Glycolipids; D012331:RNA, Fungal; C439671:mannosylerythritol lipid; D000217:Acyltransferases; D008364:Mannosyltransferases