Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 76, Issue 5, Pages 1079-1091Publisher
SPRINGER
DOI: 10.1007/s00253-007-1093-7
Keywords
Phanerochaete sordida; EGFP; genetic transformation; PsURA5; uracil auxotroph
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Phanerochaete sordida YK-624 is a hyper lignin-degrading basidiomycete possessing greater ligninolytic selectivity than either P. chrysosporium or Trametes versicolor. To construct a gene transformation system for P. sordida YK-624, uracil auxotrophic mutants were generated using a combination of ultraviolet (UV) radiation and 5-fluoroorotate resistance as a selection scheme. An uracil auxotrophic strain (UV-64) was transformed into a uracil prototroph using the marker plasmid pPsURA5 containing the orotate phosphoribosyltransferase gene from P. sordida YK-624. This system generated approximately 50 stable transformants using 2 x 10(7) protoplasts. Southern blot analysis demonstrated that the transformed pPsURA5 was ectopically integrated into the chromosomal DNA of all transformants. The enhanced green fluorescent protein (EGFP) gene was also introduced into UV-64. The transformed EGFP was expressed in the co-transformants driven by P. sordida glyceraldehyde-3-phosphate dehydrogenase gene promoter and terminator regions.
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