Objective: To determine the effect of large genomic region deletion in a Saccharomyces cerevisiae strain on tyrosine yield and to identify new genetic modification targets through transcriptome analysis.

Results: TAL was used to produce p-coumaric acid (p-CA) from tyrosine to quantity tyrosine yield. S. cerevisiae mutant strain NK14 with deletion of a 23.8 kb genomic region was identified to have p-CA production of 10.3 mg L^{- 1}, while the wild-type strain BY4741 had p-CA production of 1.06 mg L^{- 1}. Analysis of growth patterns and stress tolerance showed that the deletion did not affect the growth phenotype of NK14. Transcriptome analysis suggested that, compared to BY4741, genes related to glycolysis (ENO2, TKL1) and the tyrosine pathway (ARO1, ARO2, ARO4, ARO7, TYR1) were upregulated in NK14 at different levels. Besides genes related to the tyrosine biosynthetic pathway, amino acid transporters (AVT6, VBA5, THI72) and transcription factor (ARO80) also showed changes in transcription levels.

Conclusions: We developed a strain with improved tyrosine yield and identified new genetic modification candidates for tyrosine production.

• PMID: 31863218
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Reference Type

Comparative Study | Journal Article

Authors

Wu Y, Cai M, Song X, Li Y, Wang H, Mao J, Liu Q, Xu H, Qiao M

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