Difference between revisions of "Part:BBa K608016"

Latest revision as of 23:12, 21 September 2011

medium promoter and strong RBS with RFP

This part consists of a medium promoter with strong RBS (PR4) and tagged with RFP to quantify the expression.

The RFP fluorescence was measured with a plate reader:

BSA calibration line

The fluorescence intensity and protein concentration were measured with the FLUOstar Omega,
which is a multi-mode microplate reader. Samples were pipetted into the microplate and analyzed via the plate reader. In this experiment we focused on the protein concentration and the fluorescence intensity of RFP. We measured the protein concentration with the bradford-assay. This is a method to determine the total protein concentration. To analyze the protein concentration of the samples, Coomassie Brillant Blue was pippeted to each sample. With the binding of the dye to the proteins the color changes from dark red to blue. The more protein in the solution the more Coomassie dye can bind to proteins and the more the color changes into blue. The absorption of bound Coomassie dye is 595nm. The absorbance is proportional with the amount of bound dye. With a series of Bovine Serum Albumin (BSA) measurements the exact protein concentration of the samples can be determined. BSA acts like a “marker” because the concentration of BSA is known and with a linear calibration line the exact protein concentration can be detected.

With RFP (Red Fluorescence Protein) the activity of promoter and RBS can be quantified. RFP served like GFP as a reporter to determine the expression level. RFP is excited at a wavelength of 580nm. The more RFP in the solution the more is the RFP fluorescence intensity.The plate reader illuminates the samples with a high energy xenon flash lamp. Optical filters or monochromator create the exact wavelength. The more RFP in the sample the higher is the RFP fluorescence intensity. The intensity is collected with the second optical system and is detected with a side window photomultiplier tube.

RFP fluorescence intensity dependent on the strenght of promoter and RBS

Promoter and RBS:
PR1: strong Promoter (J23104) strong RBS (B0034)
PR2: strong Promoter (J23104) medium RBS (B0032)
PR3: strong Promoter (J23104) weak RBS (B0031)
PR4: medium Promoter (J23110) strong RBS (B0034)
PR5: medium Promoter (J23110) medium RBS (B0032)
PR6: medium Promoter (J23110) weak RBS (B0031)

sample	PR1	PR2	PR4	PR5	PR6
RFP fluorescence intensity	25310.5	27144.5	9675.1	13415.9	685.6
factor	36.9	39.6	14.1	19.6	1.0

The results of this test show that PR4 is 14.1 times stronger than PR6. The fluorescence intensity of RFP varies, and because of lack of time we could not repeat this experiment. We have also tested the promoter and RBS activity with GFP as a reporter and the results deviate from this experiment. So we are looking forward to test this system another time.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
INCOMPATIBLE WITH RFC[12]
Illegal NheI site found at 7
Illegal NheI site found at 30
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
INCOMPATIBLE WITH RFC[25]
Illegal AgeI site found at 616
Illegal AgeI site found at 728
1000
COMPATIBLE WITH RFC[1000]

@@ Line 2: / Line 2: @@
 <partinfo>BBa_K608016 short</partinfo>
-This part consists of a medium promotor with strong RBS (PR4) and tagged with RFP to quantify the expression.
+This part consists of a medium promoter with strong RBS (PR4) and tagged with RFP to quantify the expression.
 The RFP fluorescence was measured with a plate reader:<br/>
@@ Line 13: / Line 13: @@
-With RFP (Red Fluorescence Protein) the activity of promotor and RBS can be quantified.
+With RFP (Red Fluorescence Protein) the activity of promoter and RBS can be quantified.
 RFP served like GFP as a reporter to determine the expression level. RFP is excited at a wavelength of 580nm. The more RFP in the solution the more is the RFP fluorescence intensity.The plate reader illuminates the samples with a high energy xenon flash lamp. Optical filters or monochromator create the exact wavelength. The more RFP in the sample the higher is the RFP fluorescence intensity. The intensity is collected with the second optical system and is detected with a side window photomultiplier tube.
-[[Image:Freiburg2011_RFP-PR4.jpg|left|thumb|400px|RFP fluorescence intensity dependent on the strenght of promotor and RBS]]
+[[Image:Freiburg2011_RFP-PR4.jpg|left|thumb|400px|RFP fluorescence intensity dependent on the strenght of promoter and RBS]]
-'''Promotor and RBS:'''<br/>
+'''Promoter and RBS:'''<br/>
-PR1:  strong Promotor (J23104) strong RBS (B0034)<br/>
+PR1:  strong Promoter (J23104) strong RBS (B0034)<br/>
-PR2: strong Promotor (J23104) medium RBS (B0032)<br/>
+PR2: strong Promoter (J23104) medium RBS (B0032)<br/>
-PR3: strong Promotor (J23104) weak RBS (B0031)<br/>
+PR3: strong Promoter (J23104) weak RBS (B0031)<br/>
-'''PR4: medium Promotor (J23110) strong RBS (B0034)'''<br/>
+'''PR4: medium Promoter (J23110) strong RBS (B0034)'''<br/>
-PR5: medium Promotor (J23110) medium RBS (B0032)<br/>
+PR5: medium Promoter (J23110) medium RBS (B0032)<br/>
-PR6: medium Promotor (J23110) weak RBS (B0031)<br/>
+PR6: medium Promoter (J23110) weak RBS (B0031)<br/>
 {|cellpadding="10" cellspacing="0" border="1"
@@ Line 52: / Line 52: @@
 <br/>
 <br/>
-The results of this test show that PR4 is 14.1 times stronger than PR6. The fluorescence intensity of RFP varies, and because of lack of time we could not repeat this experiment. We have also tested the promotor and RBS activity with GFP as a reporter and the results deviate from this experiment. So we are looking forward to test this system another time.
+The results of this test show that PR4 is 14.1 times stronger than PR6. The fluorescence intensity of RFP varies, and because of lack of time we could not repeat this experiment. We have also tested the promoter and RBS activity with GFP as a reporter and the results deviate from this experiment. So we are looking forward to test this system another time.
 <br/>
 <br/>