Difference between revisions of "Part:BBa K1106000:Experience"

Latest revision as of 02:18, 28 September 2013

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••

IgemBsAs 2013

Objective

Characterize the response of the hybrid promoter to the HSL/LuxR inducer complex.

Method

A culture of Rhizobium leguminosarum was grown overnight (ON), in TY medium, at 30°C. Besides, a culture of E. coli carrying a plasmid that encodes mRFP under a hybrid promoter inducible by the Lux system of Vibrio fischeri , and repressible by the phage repressor P22 C2 (Bba_K1106000) was also grown ON, at 37°C, in LB with the appropriate antibiotic. As a positive control, a Chromobacterium violaceum culture was grown at 30°C in LB medium.

Afterwards, the three cultures were centrifuged. E. coli (DH5α strain) and Chromobacterium violaceum culture’s supernatants were discarded and the pellets were resuspended in Rhizobium leguminosarum culture’s supernatant, containing HSL, which would induce mRFP expression in E. coli, and violacein expression in Chromobacterium violaceum.

Cultures were then grown for 72 hours, and aliquots were taken at 0, 24 and 72 hours of induction. Finally, bacteria were sonicated and fluorescence measured, normalized by cell growth (OD 600nm).

Results

A mayor fluorescence production can be seen in the culture induced with AHL, compared with the one whithout induction.

Conclusions

According to the results, the hybrid promoter (Bba_K145150) can be induced by HSL-LuxR. However, fresh medium mRFP curve suggests a high basal transcription from this promoter.

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User Reviews

UNIQ2c98783df7958438-partinfo-00000001-QINU UNIQ2c98783df7958438-partinfo-00000002-QINU

@@ Line 1: / Line 1: @@
 __NOTOC__
 This experience page is provided so that any user may enter their experience using this part.<BR>Please enter
 how you used this part and how it worked out.
-===Applications of BBa_K1106000===
+{|width='80%' style='border:1px solid gray'
+|-
+|width='10%'|
+<partinfo>BBa_K1106004 AddReview 2</partinfo>
+<I>IgemBsAs 2013</I>
+|width='60%' valign='top'|
+'''Objective'''
+Characterize the response of the hybrid promoter to the HSL/LuxR inducer complex.
+'''Method'''
+A culture of ''Rhizobium leguminosarum'' was grown overnight (ON), in TY medium, at 30°C. Besides, a culture of E. coli carrying a plasmid that encodes mRFP under a hybrid promoter inducible by the Lux system of ''Vibrio fischeri'' , and repressible by the phage repressor P22 C2 (Bba_K1106000) was also grown ON, at 37°C, in LB with the appropriate antibiotic. As a positive control, a ''Chromobacterium violaceum'' culture was grown at 30°C in LB medium.
+Afterwards, the three cultures were centrifuged. ''E. coli'' (DH5α strain) and ''Chromobacterium violaceum'' culture’s supernatants were discarded and the pellets were resuspended in ''Rhizobium leguminosarum'' culture’s supernatant, containing HSL, which would induce mRFP expression in E. coli, and violacein expression in ''Chromobacterium violaceum''.
+Cultures were then grown for 72 hours, and aliquots were taken at 0, 24 and 72 hours of induction.  Finally, bacteria were sonicated and fluorescence measured, normalized by cell growth (OD 600nm).
+'''Results'''
+A mayor fluorescence production can be seen in the culture induced with AHL, compared with the one whithout induction.
+[[File:Phibrido.JPG|center|400px]]
+'''Conclusions'''
+According to the results, the hybrid promoter (Bba_K145150) can be induced by HSL-LuxR. However, fresh medium mRFP curve suggests a high basal transcription from this promoter.
+|};
 ===User Reviews===