Part:BBa_K3930018

Gene coding for the lycopene cyclase CrtY Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Introduction

This sequence codes for the CrtY enzyme, that transforms Lycopene into β-carotene. The CrtY sequence comes from Pantoea ananatis and is codon optimized for an expression into S.cerevisiae. Its sequence is described into the publication of (López et al. 2020).

Characterisation

Production of β-carotene

The carotenoids contained in the cells were extracted using the method described by López et al. (2020). Yeast cells were lysed in acetone using glass beads and the supernatant obtained after this lysis was analyzed by RP-HPLC using a C18 column.In the LycoYeast-pFRAMBOISE-notfused strains, Figure 4 shows that lycopene is converted into a new product with a higher retention time upon induction. Considering the yellow color of pFRAMBOISE-notfused strains, as well as the in-line following β-ionone production results, this new peak most likely corresponds to β-carotene, the expected precursor. Nonetheless, it seems that the negative control from the Teto7 promoter doesn't work when there is no inducer added in the media of culture

Figure 5: Carotenoid analysis of the engineered strain LycoYeast-pFRAMBOISE-notfused

tr= retention time; 3 peaks are observed in a non-modified and a modified but not induced LycoYeast while 4 peaks are present in a LycoYeast-pFRAMBOISE-notfused strain.

The CrtY (BBa_K3930018) part works under those lab conditions

References

1. López J, Bustos D, Camilo C, Arenas N, Saa PA, Agosin E. 2020. Engineering Saccharomyces cerevisiae for the Overproduction of β-Ionone and Its Precursor β-Carotene. Front Bioeng Biotechnol. 8:578793. doi:10.3389/fbioe.2020.578793.