[Establishment and application of a genetic operating system in for the synthesis of tetraacetyl phytosphingosine].

(.), an unconventional heterothallic yeast species, is renowned for its high production of tetraacetyl phytosphingosine (TAPS). Due to its excellent performance in TAPS production, this study aimed to construct a genetic operating system of . to enhance the production of TAPS and to screen high-yielding strains by mutagenesis and genetic engineering, thus laying the foundation for further development of industrial production of sphingolipid metabolites. In this study, we selected two autonomous replication elements (CEN, 2μ) and mined 11 endogenous promoter elements to establish a genetic operating system in . . The overexpression of and in the sphingolipid metabolism pathway significantly increased the production of TAPS. Meanwhile, we established a method for the identification of haploid mating types of . by combining RT-PCR and flow cytometry. Five strains of . with different mating types constructed from the standard diploid . ATCC 14091 were screened out. A-type haploid . 140 showcased the highest production of TAPS with a yield of 4.74 mg/g and a titer of 32.61 mg/L. Mutant strains . 140-A9 and . 140-A11 were induced by atmospheric pressure room temperature plasma mutagenesis. The recombinant strains . 140 OE and . 140 OE with overexpression were constructed with the genetic operating system established in this study. The TAPS yields of the mutant strains increased by 61.39% and 67.09%, respectively, compared with that of starting strain . 140. The recombinant strains cultured in the LCBNB medium achieved yields of 10.60 mg/g and 12.14 mg/g, respectively, representing 2.24 and 2.56 times of that in strain . 140. Moreover, the yields of the two recombinant strains were significantly higher than that of the diploid strain ATCC 14091. The genetic operating system and the haploid strain . 140 established in this study provide a basis for the subsequent establishment of genetic engineering tools for . .