Team:UC Davis/AndersonPromoters2

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Testing Constructs

Check out our initial experiments with our testing constructs that served as a proof of concept for RiboTAL function.

Anderson Promoters

Find out how we controlled the Anderson family of promoters through induction.
Also, see the secondary data page, here.

Quick Links

Targeting the Anderson Promoters (Secondary Data)

We inserted five different Anderson promoters (J23100, J23101, J23105, J23106, and J23109) upstream of TALe binding site 2 corresponding to TAL repressor 8 and a reporter, GFP. These constructs were then cotransformed with our construct containing TAL repressor 8 under the control of theophylline riboswitch 8.1* and pBAD [1].

We expected to see GFP expression vary with promoter strength, with a larger relative strength overall showing greater fluorescence levels than one with a smaller relative strength. We used the table of Variant RFP (au) values from the Anderson promoter pages as our measure for the relative strengths of the promoters we used. This was generally true for most of our constructs.

However, our J23106 construct did not perform as expected with much lower expression levels of fluorescence than its relative strength would predict. This can be seen in the data below, along with how the addition of the TAL binding sequence may have affected promoter strength.

TAL Binding Site alters Anderson Promoter ActivityReturn to Top

Promoter Relative Strength Fluorescence/OD Expected Fluorescence/OD
J23100 1 76048.39 76048.39
J23101 0.7 65469.43 53233.88
J23105 0.24 8812.306 18251.61
J23106 0.47 1341.74 35742.74
J23109 0.04 925.0912 3041.936

With consideration of data in the Registry, it appears that the TAL Binding Site has some sort of effect on the relative strengths of these promoters. Both J23105 and J23106 exhibit different promoter activities with the presence of the TAL Binding Site. In earlier characterizations, J23106 is a stronger promoter than J23105, but with the inclusion of the TAL binding site, the opposite is true. These findings demonstrate the limitations in composability of J23106. Furthermore, the general discrepancy between expected fluorescence values and actual fluorescences values also shows the general variance in characterization and experimental conditions between labs.

3D RiboTALe Data PlotReturn to Top

Here is a graphical representation of some of our RiboTALe characterization data. The graph can be toggled between 2D and 3D plot modes. The data sets plotted can also be turned on or off through the use of the corresponding buttons in the upper right of the graph. Feel free to click the navigation buttons or drag the 3D graph in order to get a better view.


This plot shows a smaller scale with the max Fluorescence/OD of 7000, so the plots for J23105, J23106 and J23109 can be seen more easily.

7000

J23105

0, 1, 2, 5, 10 7533.047431,6370.331682,5990.223684,2922.509781,2186.773466 474.3233961,235.1842546,264.0535921,144.8641036,56.24994637 0, .01, .1, .25, .5, 1 0, 1, 2, 5, 10 8812.305599,7892.957239,7533.047431,7579.954392,7888.945451,6805.733113, 7563.486294,6640.472268,6370.331682,6253.6198,5534.528131,5860.052523, 6553.583112,5385.001711,5990.223684,5436.21014,4856.993296,5548.690175, 3109.416405,2875.640374,2922.509781,2660.378131,2699.499797,2876.530258, 2097.690672,2117.866102,2186.773466,2066.628283,2354.494675,2207.135702 901.9688537,352.754544,474.3233961,274.8370082,964.5829582,131.6683122, 173.4047574,83.7298617,235.1842546,87.45576228,147.7822028,45.53135492, 131.1607144,704.5895154,264.0535921,122.033044,96.90805522,113.3800229, 237.4232758,73.51396005,144.8641036,48.61349215,88.64882984,38.65762174, 28.38574215,40.28067521,56.24994637,20.55443453,40.29182958,69.83170289

J23106

0, 1, 2, 5, 10 1143.671555,1113.875803,1095.652133,1014.904465,1011.776987 6.122578322,52.76486731,56.15251207,23.41746144,21.04377116 0, .01, .1, .25, .5, 1 0, 1, 2, 5, 10 1341.739873,1253.722707,1143.671555,1426.316189,1197.883339,1194.643952, 1245.694646,1192.559043,1113.875803,1365.114347,1091.300427,1140.861909, 1260.370064,1137.689575,1095.652133,1318.814458,1094.357512,1138.75199, 1100.642767,982.5552421,1014.904465,1081.786216,954.6730307,985.045415, 1009.218344,977.0919833,1011.776987,985.080509,1005.811758,1033.441572 29.72707759,19.18243567,6.122578322,20.73434182,55.93695971,37.54780653, 35.19508365,11.5287082,52.76486731,14.77007333,26.52770527,8.296078047, 21.78491439,32.91522832,56.15251207,12.42786451,3.952972368,8.013145325, 11.85982218,23.14421652,23.41746144,155.4244472,21.62208768,5.821220612, 11.17418373,4.27155103,21.04377116,16.94729334,23.00187831,19.99511793

J23109

0, 1, 2, 5, 10 1037.815719,1003.632865,997.6508013,912.070168,664.1533463 6.533826992,7.610089852,12.17300425,16.37293291,0.78231349 0, .01, .1, .25, .5, 1 0, 1, 2, 5, 10 925.0911877,960.1962864,1037.815719,1058.657115,986.9207353,896.7875544, 861.8894124,916.1772568,1003.632865,1017.699865,1012.165592,889.6819299, 599.2391802,915.5235762,997.6508013,1007.517453,991.7154276,955.7963452, 1041.621487,906.6285868,912.070168,888.3245713,853.4524525,930.5172409, 655.0211174,676.9155936,664.1533463,661.4786804,680.5517376,668.3791495 6.591307623,31.07102163,6.533826992,34.50916728,87.65383543,7.167267733, 12.79379878,35.46215647,7.610089852,14.47083964,11.54059793,1.192383657, 334.893904,11.84526361,12.17300425,8.505818035,7.936113763,5.568196358, 204.2909781,21.33787907,16.37293291,5.798384994,19.66398171,20.33713375, 15.68057096,17.49085027,0.78231349,5.867255805,7.709058,15.41543204

Play With Me

References

[1] S. A. Lynch and J. P. Gallivan, "A flow cytometry-based screen for synthetic riboswitches," Nucleic Acids Research, vol. 37, pp. 184-192, Jan 2009.

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