0 software. GenBank accession numbers The annotated KU70 and KU80 sequences from R. toruloides ATCC 204091 have been deposited in GenBank under the accession number of KF850470 and KF850471, respectively. Acknowledgements This material is based on research supported in part by the Singapore Caspase inhibitor National Research Foundation under CRP Award No. NRF-CRP8-2011-02, the Singapore Economic Development Board and Temasek Trust. We thank Professor Mark Featherstone, Nanyang Technological

University, Singapore, for the kind discussions of the work. Electronic supplementary material Additional file 1: Colony colors of ∆car2e after being transformed with a wild type copy of the R. toruloides CAR2 genomic DNA fragment. ∆car2e is a hygromycin sensitive derivative of a CAR2 targeted deletion mutant made by activating the Cre recombinase gene stably integrated into the genome. (TIFF 2 MB) Additional file 2: Schematic eFT508 purchase diagram of CAR2 deletion constructs with varied homology length sequence ranging from 50 to 1500 bp used to compare the homologous recombination frequencies between WT and KU70-deficient strain. Restriction enzyme digest sites used for cloning and Southern blot analysis are

indicated. The components in the diagram are not drawn to scale. (TIFF 144 KB) Additional file 3: Comparisons of WT and ∆ku70 strains. (A) Cell morphology; (B) growth rate; (C) sugar consumption

rates; (D) fatty acid profiles. (TIFF 684 KB) Additional file 4: Comparison of gene deletion frequency SC79 clinical trial between different WT and KU70 -deficient fungal stains. (TIFF 120 KB) Additional file 5: (A) Schematic illustration of T-DNA region of pDXP795hptR. Unique restriction enzyme digest sites used are shown. (B) Schematic illustration of CAR2 complementation plasmid within T-DNA region. (TIFF 68 KB) References 1. Sampaio JP, Gadanho M, Bauer R, Weiß M: Taxonomic studies in the Microbotryomycetidae: Leucosporidium golubevii sp. nov., Leucosporidiella gen. nov. and the new orders Leucosporidiales and Sporidiobolales. Mycol Prog 2003, 2:53–68.CrossRef 2. Li Y, Zhao ZK, Bai F: High-density cultivation of oleaginous yeast Rhodosporidium toruloides Fludarabine mw Y4 in fed-batch culture. Enzyme Microb Tech 2007, 41:312–317.CrossRef 3. Zhu Z, Zhang S, Liu H, Shen H, Lin X, Yang F, Zhou YJ, Jin G, Ye M, Zou H, Zhao ZK: A multi-omic map of the lipid-producing yeast Rhodosporidium toruloides . Nat Commun 2012, 3:1112.PubMedCentralPubMedCrossRef 4. Ratledge C, Wynn JP: The biochemistry and molecular biology of lipid accumulation in oleaginous microorganisms. Adv Appl Microbiol 2002, 51:1–44.PubMedCrossRef 5. Ageitos J, Vallejo J, Veiga-Crespo P, Villa T: Oily yeasts as oleaginous cell factories. Appl Microbiol Biotechnol 2011, 90:1219–1227.PubMedCrossRef 6.