Coding

Part:BBa_K3257045

Designed by: Yi Qiao   Group: iGEM19_Fudan-TSI   (2019-09-05)
Revision as of 03:55, 6 October 2019 by YY12138 (Talk | contribs)

Improved LacI

LacI is one of the genes in Lac operon encoding the inhibitor protein binding to LacO sites (cis-acting element). In response to IPTG, the inhibitor protein detaches from LacO and enables the transcription of downstream genes. We mutated some specific sites in the LacI gene to improve its sensibility to IPTG.<upper>[1]<upper> Using EGFP as a reporter, its fluorescence intensity appears a lower leakage and the same level of expression before and after the induction of IPTG. Also, we induce the improved Lac operon by arabinose to verify its orthogonal response to IPTG.

This part is improved in the following three main aspects.

Lower Response to Arabinose, Better Orthogonality

Same Level of Expression when Induced by IPTG

Lower Uninduced Leakage


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]


Reference

[1] AJ Meyer et al. Escherichia coli "Marionette" strains with 12 highly optimized small-molecule sensors. Nat Chem Biol. 2019 Feb;15(2):196-204. doi: 10.1038/s41589-018-0168-3. Epub 2018 Nov 26.


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