Team:Hong Kong HKUST/pneumosensor/future work

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<li><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/module_one">Detection module</a></li>
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<li><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/future_work">Future Work</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/module_one">Detection module</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/module_two"><i>S. pneumoniae</i> sigma X promoters module</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/results">Results</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/pneumosensor/future_work">Future Work</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/riboregulator/results">Results</a></li>
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<li class='site_link'><a href="https://2014.igem.org/Team:Hong_Kong_HKUST/riboregulator/future_work">Future Work</a></li>
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Revision as of 12:11, 10 October 2014




Pneumosensor Future Work

Lysis Module

Our team designed but was unable to test this module due to the limitation of not being able to work directly with Streptococcus Pneumoniae (Biosafety level 2) in our lab. This module proposes to kill Streptococcus Pneumoniae upon detection when coupled with the detection and regulation modules by releasing specific bacteriophage lytic enzymes, Cpl-1 and Pal.


Amidase (PAL)- cleaves the peptidoglycan between N-acetylmuramic acid and L-alanine

Lysozyme (CPl-1)- cleaves the glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine

The enzymes are tagged with osmY (Washington 2012) via a linker to be exported out of Escherichia coli. Both enzymes have very different N-terminal catalytic sites and share a similar C-terminal cell wall attachment site, which binds to choline in both cases. Cleavage with either of these enzymes results in a weakening in the cell wall, which leads to the externalization of the cytoplasmic membrane and ultimate lysis of S. pneumoniae.

σx, PchbB, PcomFA

1. Put inducible promoter upstream of RBS (BBa_B0034), σx gene, and terminator (BBa_B0015). An example of inducible promoter is BBa_I0500. Hence, by putting an inducible promoter, we can tune the level of σx expression and characterize combox promoters (PchbB and PcomFA) on different level of σx concentration.

2. Further characterization of combox promoters (PchbB and PcomFA) by making a 3-D Graph for time, σx concentration, and Fluorescence expression.

3. Characterizing combox promoters (PchbB and PcomFA) specificity by introducing other proteins.

4. Continue comW construction, ligate with terminator (BBa_B0015), and introduce it to E.coli DH10B strain.

5. Characterization of comW by measuring the amount of σx with and without ComW protein. (The function of ComW protein is to protect σx from being degraded by ClpXP degradation enzyme)


References

J.M. Loeffler et al "Rapid Killing of Streptococcus pneumoniae with a Bacteriophage Cell Wall Hydrolase" 2001

J.M. Loeffler et al "Phage Lytic Enzyme Cpl-1 as a Novel Antimicrobial for Pneumococcal Bacteremia" 2003

J.M. Loeffler et al "Synergistic Lethal Effect of a Combination of Phage Lytic Enzymes with Different Activities on Penicillin-Sensitive and -Resistant Streptococcus pneumoniae Strains" 2003

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