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                <i>Mercury is a poisonous heavy metal that poses a threat to aquatic life and humans. Recently, increasing attention has been paid to mercury remediation and its detection in the environment by biological technology. In our project, a series of mercury-specific binding peptide termed metal catcher (MC), which has a high affinity and selectivity toward mercury, was examined. The subsequent IC and GFP were fused and displayed on Escherichia coli cell surface by using an N-terminal region ice nucleation protein anchor. </i>
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            <i>Whole-cell sorbents of construction facilitated selective adsorption of mercury ions from a solution containing different heavy metal ions and detection mercury and cooper. The MC aided rapid detection of copper, mercury, and cadmium in 2 min with a low detection limit (1 uM).Additionally, mercury levels were reduced by approximately 36% by using the MC. The transformant strains were then fed to Cyprinus carpio and colonized in the microbiota. C. carpio with transformants showed significantly lower accumulation of heavy metals compared to the control group. The control group was E. coli BL21 containing a pET23b plasmid without any exogenous gene. Moreover, the metal remediation ability of the microbiota with transformants was improved by Illumina MiSeq 16S rRNA amplicon sequencing. The surface-engineered E. coli effectively protected fish from the toxicity of mercury ions at high concentrations in an aquatic environment. Thus, gut remediation is an ideal approach to control heavy metal contamination in fish.</i>
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          The LANZHOU iGEM 2016 team consists of 1 graduate students, 14 undergraduate students and 6 instructors. The main part of our project was finished by students from LANZHOU iGEM. We would like to thank our 6 instructors sincerely, for their time and efforts of helping us improve our project. Our work can be divided into 7 parts which are shown below. Each part of work was finished by several student members.
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          We helped them finish the “another inhibitor” system (arac+pBAD+B0034+TetR+B0015+pTet+B0034+RFP+B0015).(Fig 1)
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                  Please Visit Us
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                    Oct. 29th 1:30AM Room 304
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            Fig 1 Inhibitor system construction.
 
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          In this system, pBAD is one of the inducible promoter (from BBa_K808000) which can be induced by arabinose. B0034 and B0032 are two kinds of strong ribosome binding sites (RBS) and the strength of B0032 is only 33.96% of B0034. pTet promoter is constitutively ON and repressed by TetR repressor.
 
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          We were very glad to help them because this “inhibitor” system is vital for their project. They use the concentration of inhibitor proteins as a signal indicating the plasmid numbers, and it can trigger the downstream reaction by activating the killer gene while the plasmid concentration reduce to the threshold.
 
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          At the same time, they helped us finish the pre experimental the fish experiment.
 
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            There are three crucial components, INP, GFP, and Metal Catcher (Fig 2). INP (Ice Nucleation Protein) is an extrinsic membrane protein of E.coli and acts as an anchor. GFP acts as a reporter while metal catcher can bind heavy-metal ions. This is how we assemble the crucial elements.
 
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          At the same time, they helped us finish the pre experimental the fish experiment.
 
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            Fig 2 The construction of membrane protein working as anchor.
 
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            It is indispensable to investigate whether the surface-displayed E. coli is more potent for detoxification of mercury than common bacteria.
 
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            They found that the concentration of mercury ions should be kept at 0.1mg/l. Higher than the value, the fish would be death, lower than the value, the mercury content difference in fish is not obvious.
 
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            Fig 3 The survival fish under different suppress of heavy metal ions.
 
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            After their help, we identified our subsequent experimental program. (Fig 3)
 
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          The cooperation with Xiamen University has begun since the summer vocation. Working as a very kind and helpful team, they asked helping us in doing TEM to confirm whether the modified protein can be seen on the surface of the bacteria when they knew that we wanted to know whether the different treatment to the bacteria can influence the TEM figure.
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          They culture our modified bacteria and the control BL21 in the 50mL LB medium adding with 100ug/mL AMP. When the OD600=0.6, add 10ul 0.5mol/L IPTG in IC (Fig 1F). Culture in 16℃ for a night. Before adding ions in the bacteria, wash the bacteria with water. Then add Cu<sup>2+</sup> in H-2 to the final concentration 25mg/L (Fig 1E), add Hg<sup>2+</sup> to the other group to the final concentration 12.5mg/L (Fig 1C and D). Separate the control in two group and one of it add the same amount of ion in it (Fig 1A and B). After cultured for another 1.5h, observe them with the TEM.
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            Fig 1 The bacteria under TEM. (A)BL21(control) + Cu<sup>2+</sup>+Hg<sup>2+</sup> (B)BL21 (C)IC + Hg<sup>2+</sup> (D)CC + Hg<sup>2+</sup> (E)IH + Cu<sup>2+</sup>(F)IC + IPTG + Hg<sup>2+</sup>
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            Unfortunately, compared with before, although the new method of treatment didn’t perform well, we still show our faithful gratitude to them.
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            n return, we helped them build up a part consisted of RBS lacI and CFP (Fig 2). It is universally acknowledge that LacI is the regulator gene of lac operon in E. coli., which will inhibit the lac operon when expressed. LacI can bind to lactose and it cannot inhibit lac operon under excess lactose, then the gene in lac operon like lacZ、lacY、lacA can be expressed. The expressing level of lacI can be easily detected after connecting CFP with lacI. So we can figure out whether lacI is related to the expressing of other gene conveniently by this improved part.
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            Fig 2 The construction of their part.
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          <h5 class="white-text">LZU-China 2016</h5>
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          <h5 class="white-text">LZU-China 2016</h5>
          <p class="grey-text text-lighten-4">NO.222, TianShui South Road, Lanzhou, China, 730000</p>
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          <h6 class="white-text">Copyright 2015 Lanzhou University</h6>
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          <h6 class="white-text">Copyright 2015 Lanzhou University</h6>
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            <li><a class="white-text" href="http://en.lzu.edu.cn/">Educational Administration Office, LZU</a></li>
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Latest revision as of 01:55, 18 October 2016


Main Team:LZU 2015

Main

Project Description

Mercury is a poisonous heavy metal that poses a threat to aquatic life and humans. Recently, increasing attention has been paid to mercury remediation and its detection in the environment by biological technology. In our project, a series of mercury-specific binding peptide termed metal catcher (MC), which has a high affinity and selectivity toward mercury, was examined. The subsequent IC and GFP were fused and displayed on Escherichia coli cell surface by using an N-terminal region ice nucleation protein anchor.

Whole-cell sorbents of construction facilitated selective adsorption of mercury ions from a solution containing different heavy metal ions and detection mercury and cooper. The MC aided rapid detection of copper, mercury, and cadmium in 2 min with a low detection limit (1 uM).Additionally, mercury levels were reduced by approximately 36% by using the MC. The transformant strains were then fed to Cyprinus carpio and colonized in the microbiota. C. carpio with transformants showed significantly lower accumulation of heavy metals compared to the control group. The control group was E. coli BL21 containing a pET23b plasmid without any exogenous gene. Moreover, the metal remediation ability of the microbiota with transformants was improved by Illumina MiSeq 16S rRNA amplicon sequencing. The surface-engineered E. coli effectively protected fish from the toxicity of mercury ions at high concentrations in an aquatic environment. Thus, gut remediation is an ideal approach to control heavy metal contamination in fish.

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