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During the last few years, the global transcription machinery engineering (gTME) technique has gained more attention as an effective approach for the construction of novel mutants. Genetic strategies (molecular biology methods) were utilized to get mutational for both genes ( SPT15  and  TAF23 ) basically existed in the  Saccharomyces cerevisiae  genome via screening the gTME approach in order to obtain a new mutant  S. cerevisiae  diploid strain. The vector pYX212 was utilized to transform these genes into the control diploid strain  S. cerevisiae  through the process of mating between haploids control strains  S. cerevisiae  (MAT-a [CICC 1374]) and (MAT-α [CICC 31144]), by using the oligonucleotide primers SPT15- Eco RI-FW/SPT15- Sal I-RV and TAF23- Sal I-FW/TAF23- Nhe I-RV, respectively. The resultant mutants were examined for a series of stability tests. This study showed how strong the effect of using strategic gTME with the importance of the modification we conducted in Error Prone PCR protocol by increasing MnCl 2  concentration instead of MgCl 2 . More than ninety mutants we obtained in this study were distinguished by a high level production of bio-ethanol as compared to the diploid control strain.

A novel constructed SPT15 mutagenesis library of Saccharomyces cerevisiae by using gTME technique for enhanced ethanol production