To simplify the construction procedure of Yarrowia lipolytica secretion/expression system,eliminate the antibiotic contamination,and use gene mel(encoding tyrosinase) as a new type reporter for constructing Y.lipolytica secretion/expression vectors.Gene mel was synthesized by assembly PCR,and fused with homologous promoter pTEF,signal sequence XPR2pre and terminator LIP2t by overlap PCR.The resulted fragment was used to construct new type of secretion/expression plasmids of Yar-rowia lipolytica expression s...