Difference between revisions of "Part:BBa K4656010"

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	However, when the temperature increased to 37℃, CI857 repressor protein denaturated, CI repressor could no longer bind to promoter PR and play a repressor role, and a large number of downstream phIF protein inhibited promoter PphIF. Therefore, the expression of toxin MazF in the pathway was inhibited, and the MazE antitoxin protein at the end of the gene route was expressed instead. Eventually the E. coli survived.		However, when the temperature increased to 37℃, CI857 repressor protein denaturated, CI repressor could no longer bind to promoter PR and play a repressor role, and a large number of downstream phIF protein inhibited promoter PphIF. Therefore, the expression of toxin MazF in the pathway was inhibited, and the MazE antitoxin protein at the end of the gene route was expressed instead. Eventually the E. coli survived.
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		+	The skeleton of this genetic route comes from Wang, X., et al.[1]
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	===Reference===		===Reference===
		+	[1] Wang, X., Han, J. N., Zhang, X., Ma, Y. Y., Lin, Y., Wang, H., Li, D. J., Zheng, T. R., Wu, F. Q., Ye, J. W., & Chen, G. Q. (2021). Reversible thermal regulation for bifunctional dynamic control of gene expression in Escherichia coli. Nature communications, 12(1), 1411. https://doi.org/10.1038/s41467-021-21654-x
	===Sequence and Features===		===Sequence and Features===

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Revision as of 17:20, 16 September 2023

PRM-CI857-PR-phIF-MazE-PphIF-MazF

The temperator-sensitive lambda CI repressor protein has a CI⁸⁵⁷ mutation, and when the temperature is reduced to 30℃, CI⁸⁵⁷ converges to synthesize a dimer, binds to the promoter PR and inhibits it, resulting in suppression of downstream phIF expression. The lowered phIF expression can not inhibit the promoter PphIF anymore and the toxin MazF downstream of it disengaged from inhibition. Therefore, when the temperature decreased, the inhibition ability of phIF to promoter PphIF was weakened or even lost, and MazF expressed a large number of toxic proteins, resulting in the death of E. coli. (MazF and MazE belong to the toxin-antitoxin suicide system.)

However, when the temperature increased to 37℃, CI857 repressor protein denaturated, CI repressor could no longer bind to promoter PR and play a repressor role, and a large number of downstream phIF protein inhibited promoter PphIF. Therefore, the expression of toxin MazF in the pathway was inhibited, and the MazE antitoxin protein at the end of the gene route was expressed instead. Eventually the E. coli survived.

The skeleton of this genetic route comes from Wang, X., et al.[1]

Usage and Biology

The gene route is temperature-controlled and can be used as a safety guarantee so that the engineered bacteria can die when they leave the human body (the temperature drops) and survive in the human body (37℃). It can solve the problem of handling engineered bacteria after they are discharged from the human body, ensuring that they play a role in the human body while doing not damage the environment.

Reference

[1] Wang, X., Han, J. N., Zhang, X., Ma, Y. Y., Lin, Y., Wang, H., Li, D. J., Zheng, T. R., Wu, F. Q., Ye, J. W., & Chen, G. Q. (2021). Reversible thermal regulation for bifunctional dynamic control of gene expression in Escherichia coli. Nature communications, 12(1), 1411. https://doi.org/10.1038/s41467-021-21654-x

Sequence and Features