Difference between revisions of "Part:BBa K4645004"

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===Characterization===
 
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<b>Successful protein expression</b>
 
<b>Successful protein expression</b>
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<p>We transformed vqmA into BL21 and cultivated in 37℃, 220 rpm. When the OD600 of bacteria reached 0.6, we induced bacteria with 1mM, 2mM IPTG, then cultivated for about 12 hours. Here is SDS-PAGE gel figure of vqmA.</p>
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<p>We transformed vqmA into BL21 and cultivated in 37℃, 220 rpm. When the OD600 of bacteria reached 0.6, we induced bacteria with 1mM, 2mM IPTG, then cultivated for about 12 hours. Here is SDS-PAGE gel figure of VqmA<sub>phage</sub>.</p>
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<center><img src="https://static.igem.wiki/teams/4645/wiki/quorum-sensing/vqma-sds-page.jpg" style="width:50%; "></center>
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<center><b>Figure 1. SDS-PAGE gel figure of VqmA<sub>phage</sub>.</b> </center>
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<center><b>Figure 2. Differential analysis of relative fluorescence intensity after 4 hours of induction under different pH.</b></center>
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Revision as of 15:54, 11 October 2023


VqmAphage

vqmA gene would translate into protein VqmAPhage.
Vibrio cholerae uses a quorum-sensing (QS) system composed of the autoinducer 3,5-dimethylpyrazin-2-ol (DPO) and receptor VqmA, which together repress genes for virulence and biofilm formation.[1] VqmAVc activates expression of the vqmR gene encoding the small regulatory RNA VqmR. Vibriophage VP882 encodes a VqmA homolog called VqmAPhage that activates the qtip promoter (Pqtip). It’s worth noting that, VqmAPhage can activate vqmR expression but VqmAVc cannot activate expression of qtip. Promoter selectivity is driven by each VqmA DNA-binding domain and key DNA sequences in the vqmR and qtip promoters are required to maintain specificity.[2]

Characterization

Successful protein expression

We transformed vqmA into BL21 and cultivated in 37℃, 220 rpm. When the OD600 of bacteria reached 0.6, we induced bacteria with 1mM, 2mM IPTG, then cultivated for about 12 hours. Here is SDS-PAGE gel figure of VqmAphage.

无标题文档


Figure 1. SDS-PAGE gel figure of VqmAphage.


Figure 2. Differential analysis of relative fluorescence intensity after 4 hours of induction under different pH.


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
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 535
  • 1000
    COMPATIBLE WITH RFC[1000]

Reference

[1] Silpe JE, Bassler BL. A Host-Produced Quorum-Sensing Autoinducer Controls a Phage Lysis-Lysogeny Decision. Cell. 2019 Jan 10;176(1-2):268-280.e13.
[2] Duddy OP, Huang X, Silpe JE, Bassler BL. Mechanism underlying the DNA-binding preferences of the Vibrio cholerae and vibriophage VP882 VqmA quorum-sensing receptors. PLoS Genet. 2021 Jul 6;17(7):e1009550.