Difference between revisions of "Part:BBa K4883013"
 
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===Usage and Biology===
 
===Usage and Biology===
  
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To mitigate vitamin B2 deficiency, we planned to make vitamin B2-enriched bread with engineered yeast, Saccharomyces cerevisiae. Overexpression of RIB7 ([https://parts.igem.org/Part:BBa_K4883002 BBa_K4883002]) should lead to the overproduction of vitamin B2 in S. cerevisiae. Ptef1 ([https://parts.igem.org/Part:BBa_K2407300 BBa_K2407300])) has been proven one of the strongest promoters of S. cerevisiae, so we used it for overexpression (Partow et al., 2010). A CYC1 terminator was also included to form the complete expression cassette.   
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To mitigate vitamin B2 deficiency, we planned to make vitamin B2-enriched bread with engineered yeast, Saccharomyces cerevisiae. Overexpression of RIB7 ([https://parts.igem.org/Part:BBa_K4883002 BBa_K4883002]) should lead to the overproduction of vitamin B2 in S. cerevisiae. Ptef1 ([https://parts.igem.org/Part:BBa_K2407300 BBa_K2407300]) has been proven one of the strongest promoters of S. cerevisiae, so we used it for overexpression (Partow et al., 2010). A CYC1 terminator was also included to form the complete expression cassette.   
  
 
===Characterization===
 
===Characterization===
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<center><img src = "https://static.igem.wiki/teams/4883/wiki/bba-k4883013-2.png" style = "width:480px"></center>
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<center><img src = "https://static.igem.wiki/teams/4883/wiki/bba-k4883013-2.png" style = "width:280px"></center>
 
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<figcaption><center>Figure 2. Vitamin B2 contents in steamed buns leavened by engineered S. cerevisiae strains.  </center></figcaption>
 
<figcaption><center>Figure 2. Vitamin B2 contents in steamed buns leavened by engineered S. cerevisiae strains.  </center></figcaption>

Latest revision as of 02:28, 6 October 2023


Ptef1-RIB7-Tcyc1

This is a complete expression cassette consisting of a strong promoter Ptef1, a RIB7 gene, and a CYC1 terminator.


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 648
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 1399
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI.rc site found at 176
    Illegal BsaI.rc site found at 580



Usage and Biology

To mitigate vitamin B2 deficiency, we planned to make vitamin B2-enriched bread with engineered yeast, Saccharomyces cerevisiae. Overexpression of RIB7 (BBa_K4883002) should lead to the overproduction of vitamin B2 in S. cerevisiae. Ptef1 (BBa_K2407300) has been proven one of the strongest promoters of S. cerevisiae, so we used it for overexpression (Partow et al., 2010). A CYC1 terminator was also included to form the complete expression cassette.

Characterization

2023 Hangzhou-SDG Team characterized this part with vitamin B2 production

Vitamin B2 Production Tests in Liquid YPD Media

The WT S. cerevisiae S288C and the strain overexpressing RIB7 were inoculated into YPD media, and cultured at 30 ℃, 180 rpm. The riboflavin concentrations in the supernatants were measured using high-performance liquid chromatography (HPLC).

Figure 1. Vitamin B2 contents in liquid YPD media containing engineered S. cerevisiae strains for 72h.

Results showed that overexpression of RIB7 increased vitamin B2 production by 33% after 72h in YPD.


Vitamin B2 Production Tests in Steamed Buns

To determine whether our engineered yeasts can help to make vitamin-B2-enriched food, we made steamed buns using our yeasts in the lab. The riboflavin concentrations in the buns were measured using HPLC.

Figure 2. Vitamin B2 contents in steamed buns leavened by engineered S. cerevisiae strains.

Results showed that overexpression of RIB7 increased vitamin B2 production by 4% in steamed buns (p > 0.05).

References

Partow, S.; Siewers, V.; Bjørn, S.; Nielsen, J.; Maury, J. Characterization of Different Promoters for Designing a New Expression Vector in Saccharomyces Cerevisiae. Yeast 2010, 27 (11), 955–964. DOI:10.1002/yea.1806.