Abstract
Objectives
To obtain functional expression of a heterologous multifunctional carotene synthase containing phytoene synthase, phytoene dehydrogenase, and lycopene β-cyclase activities encoded by carS from Schizochytrium sp. in order to allow Yarrowia lipolytica to produce β-carotene.
Results
To increase the integration efficiency of a 3.8 kb carS under the control of P GPD promoter with a 2 kb selection marker, ura3, along with a geranylgeranyl diphosphate synthase (GGS1) expression cassette (~10 kb in total), was inserted into the Y. lipolytica chromosome, and the DNA assembler method was combined with double chromosomal deletions of ku70 and ku80. This method resulted in a 13.4-fold increase in integration efficiency compared with the original method, reaching 63% (10/16). The resulting recombinant Y. lipolytica produced 0.41 mg β-carotene per g dry cell weight, while the wild type did not produce any indicating the functionality of the multifunctional carotene synthase in Y. lipolytica.
Conclusion
Expression of GGS1 and a multifunctional carotene synthase from Schizochytrium sp. in Y. lipolytica led to β-carotene production. DNA assembler efficiency was greatly increased by the deletion of ku70 and ku80, which resulted in decreased in vivo nonhomologous end-joining (NHEJ) in Y. lipolytica.
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Acknowledgements
We thank Professor Hal S. Alper for the generous gift of the pMCSCen1 plasmid. This work was financed by the Ministry of Science and Technology of China (973:2014CB745101).
Supporting information
Supplementary Table 1—Primers used.
Supplementary Fig. 1—Transmembrane prediction analysis of carB enzymes from (A) Blakeslea trispora and (B) Mucor circinelloides.
Supplementary Fig. 2—Transmembrane prediction analysis of (A) carRA enzyme from Blakeslea trispora and (B) carRP enzyme from Mucor circinelloides.
Supplementary Fig. 3—URA3 disruption of CIBTS1961 via the CRISPR-Cas9 system.
Supplementary Fig. 4—Disruption of URA3 in CIBTS1961, mediated by the CRISPR-Cas9 system.
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Gao, S., Tong, Y., Zhu, L. et al. Production of β-carotene by expressing a heterologous multifunctional carotene synthase in Yarrowia lipolytica . Biotechnol Lett 39, 921–927 (2017). https://doi.org/10.1007/s10529-017-2318-1
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DOI: https://doi.org/10.1007/s10529-017-2318-1