Part:BBa_K274003:Experience
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Applications of BBa_K274003
UNIQ3dcedcf0ed72ff21-partinfo-00000000-QINU
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No review score entered. iGEM14_BNU-China |
[[File: SHSBNU 17 40aL1.jpg|600px|thumb|center|Figure 1]] Figure 1 TtrS/R system and ThsS/R system ThsS (BBa_K2507000) and ThsR (BBa_K2507001), both codon-optimized for E. coli, are two basic parts which belong to the two-component system from the marine bacterium Shewanella halifaxensis. By linking thsR with chromoprotein genes (BBa_K2507009, BBa_K2507010, BBa_K2507011) or the violacein producing operon vioABDE (BBa_K2507012), this system can respond to thiosulfate by producing a signal visible to the naked eye, such as chromoproteins (spisPink-pink chromoprotein, gfasPurple-purple chromoprotein, amilCP-blue chromoprotein) or a dark-green small-molecule pigment (protoviolaceinic acid). E. coli-codon-optimized TtrS(BBa_K2507002) and TtrR (BBa_K2507003) are two basic parts which are derived from the two-component system of the marine bacterium Shewanella baltica. By linking ttrR with chromoprotein genes (BBa_K2507009, BBa_K2507010, BBa_K2507011) or the violacein producing operon vioABDE (BBa_K2507012), this system can respond to thiosulfate by producing a signal visible to the naked eye such as chromoproteins (spisPink-pink chromoprotein, gfasPurple-purple chromoprotein, amilCP-blue chromoprotein) or a dark-green small-molecule pigment (protoviolaceinic acid). [[File: SHSBNU 17 40aL2.jpg|600px|thumb|center|Figure 2]] Figure 2. Characterization of the ThsS/R and TtrS/R system by observing the chromprotein expression levels. We added 1mM, 0.1mM, 0.01mM and 0 Na2S2O3 to ThsS/R system and added 2.5mM, 1mM, 0.1mM and 0 Na2S4O6·2H2O to ThsS/R system. The results demonstrate there is an obvious response in the ThsS/R system. In a. gfasPurple system, the response curve is obvious, and b. spisPink & c. amilCP with rather heavy leaky expression without inducer. d.e.f. However, in TtrS/R system there is no clear result. [[File: SHSBNU 17 40aL3.jpg|600px|thumb|center|Figure 3]] Figure 3. Characterization of the ThsS/R and TtrS/R system by observing the protoviocaceinic acid( dark-green pigment). We added 1mM, 0.1mM, 0.01mM and 0 Na2S2O3 to ThsS/R system and added 2.5mM, 1mM, 0.1mM and 0 Na2S4O6·2H2O to ThsS/R system. The results demonstrate there is an obvious response in the ThsS/R system with rather heavy leaky expression without inducer. And the Ths/R+protoviolaceinic acid works rather well! UNIQ3dcedcf0ed72ff21-partinfo-00000003-QINU
User ReviewsE. coli turned dark green after transformation of this plasmid. This is unexpected as there is no promoter upstream of the operon.
Characterization by 2012 UCSF iGEM Team
The purpose of this part is to produce prodeoxyviolaceinic acid, a green pigment. However, only the genes for producing the enzymes VioA, VioB, and VioE are necessary to produce the green pigment. Therefore, we have deposited our part (lacking VioD) as a smaller and improved version of BBa K274003. Additionally, BBa_K726016 has a T7 promoter and we have shown that it is able to make the green pigment: We attempted to try and use the Dark Green E.chromi biobrick (BBa_K274003) in our machine constructs. Although the part was excised using EcoR1 and Spe1 (Fermentas), when we attempted to clone anything in front of this part, by digestion with EcoR1 and Xba1 (Fermentas), we could not obtain any positive clones.
Suspecting that perhaps the restriction sites were not present, we tested the plasmid samples through restriction digests.
Figure 1. E.chromi Dark Green digested with various restriction enzymes to confirm the presence of the Biobrick restriction sites.
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