Difference between revisions of "Part:BBa M50051:Experience"

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Applications of BBa_M50051

Stanford Location

Plasmid Name: LsrR Repressor Protein

DNA 2.0 Gene #: pD444-CH

Organism: E. coli

Device Type: Actuator

Glycerol Stock Barcode: 0133027118

Box Label: BIOE44 F16

Data

Figure 1: Images of the Western Blot with BBa_M50051(Sections E and F) compared to wild-type control (Sections C and F)

Figure 2: Graph of the growth curves based on optical density readings at 600 nm over time of the LsrR transfected E. coli strain and the Cupid Pink (Pink) control strain at two different induced IPTG concentrations. A) Strains were induced at an in-solution IPTG concentration of 0 μM IPTG B) Strains were induced at an in-solution IPTG concentration of 1000 μM IPTG

Data Analysis and Conclusions

All figures show comparisons between the LuxS transfected bacteria, a wild-type control strain, and a similar IPTG-inducible E. coli strain with a T5 promoter (Pink).

Western Blot

Cell Density Tests

Experimental Procedures

Western Blot

Western Blots were performed on transformed bacteria to verify the expression of LuxS and LsrR, and on the untransformed E. coli cells, control, to account for any background. To do so, cultures of each strain were grown overnight at 37 degrees Celsius and split into two aliquots, each induced with either 0 μM and 1000 μM IPTG. Samples were then taken at 0, 4, 6, and 22 hours post-induction to measure the protein levels over time. To normalize the protein levels, 8*108 cells were taken from each samples, and the samples were immediately pelleted and frozen to prevent the cells from synthesizing anymore. After the samples have been collected, the bacteria were lysed with 10% SDS and boiled at 100 degrees Celsius for 10 minutes to denature the proteins. Sodium dodecylsulfate polyacrylamide gel electrophoresis was performed on the samples to separate the proteins based on molecular weight. The proteins were transferred onto a PVDF membrane and blocked with Pierce Fast Block for 5 minutes to stop nonspecific interactions and probed with anti-his antibody diluted at 1:1000 in Blotto for 1 hour. Afterwards the membrane was washed with TBS for 5 minutes three times and incubated in the 1:1000 goat-anti-mouse HRP conjugated secondary antibody. A 1:10 dilution of chromogenic substrate, Opti-4CN was then added and then membrane was imaged.

Cell Density Tests

User Reviews

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