Difference between revisions of "Part:BBa K2377014"
 
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(ZraS* ,ZraR*  means activated condition.)
 
(ZraS* ,ZraR*  means activated condition.)
 
   
 
   
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So, we substitute Zinc-Responsive Two-Component regulatory system for the copper one in BBa_K1755301. Successfully construct a new heavy metal sensor.
 
So, we substitute Zinc-Responsive Two-Component regulatory system for the copper one in BBa_K1755301. Successfully construct a new heavy metal sensor.
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Function of improved new part
 
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Improved new part is BBa_K2377009, which can detect the concentration of Zn2+ and transform it into electric signal.
 
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The downstream protein ribB (3,4-dihydroxy-2-butanone 4-phosphate synthase ,ribB) could catalyze the conversion of D-ribulose 5-phosphate formate to 3,4-dihydroxy-2-butanone 4-phosphate. This step is part of the biosynthesis pathway of riboflavin, an electron carrier in microfunction circuit (MFC).
 
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So when the whole gene circuit works, it will result in a consequence that once the concentration of Zn2+ in environment increased, more riboflavin will be produced to impact the voltage of MFC.
 
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Through this new part we realized monitoring heavy metal Zn2+ automatically, quantitatively and efficiently.
 
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The figure below shows the comparison of the part BBa_K1755301 (left) with the new improved part BBa_K2377009 (right), the riboflavin concentration versus heavy metal ion concentration.
 
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<img src="https://static.igem.org/mediawiki/parts/e/e9/Lanzhou_Parts_1.png
 
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Reference
 
Reference

Latest revision as of 22:59, 31 October 2017


zarp, zinc two-component relulatory system

Improved target: BBa_K1755301（K1755024、K1755305、K1755303）

Improved form We replaced a sensor element（Copper-Responsive Two-Component System BBa_K190017）for the Zinc-Responsive Two-Component regulatory system (contains σ54 promoter).

Mechanism of changed sensor The mechanism of Zinc sensor is related to a intrinsic signaling pathway in Ecoli. Which is known that many sensing proteins ZraS immobilized on the membrane of cell. And when Zn2+ show up in periplasmic space, the ions will combine with ZraS and trigger it autophosphorylation. (ZraS*) The phosphorylation signal will transmit from ZraS* to ZraR, then ZraR* come to ZraR(HydG) binding site[1] that will make σ54promoter start downstream transcription. (ZraS* ,ZraR* means activated condition.)

800px-Lanzhou_Parts_2.png

So, we substitute Zinc-Responsive Two-Component regulatory system for the copper one in BBa_K1755301. Successfully construct a new heavy metal sensor.

Reference

[1] Leonhartsberger S, Huber A, Lottspeich F, et al. The hydH/G Genes from Escherichia coli code for a zinc and lead responsive two-component regulatory system.[J]. Journal of Molecular Biology, 2001, 307(1):93-105. [2] Munson GP1, Lam DL, Outten FW, O'HalloranTV. Identification of acopper-responsive two-component system on the chromosome of Escherichia coli K-12. [3] PedorolluD1,2, The ribB FMN riboswaith from Escherichia coli operates at the transcriptional and translational level and regulates riboflavin biosynthesis. FEBS J. 2015 Aug;282(16):3230-42. doi: 10.1111/febs.13226. Epub 2015 Feb 27.

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]