License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
2023 NUS-Singapore iGEM team followed this protocol to characterise their New Composite Part "GFP-sacB" with IPTG and sucrose solution at various concentrations.
Materials
LB media
M9 Media
Correct Antibiotics
IPTG Solution
Sucrose Solution
DI Water
Safety warnings
Proper lab PPE must be worn at all times.
Since cells are used in this protocol, a Biosafety Cabinet (BSC) is required to ensure safety.
Cell Inoculation and Incubation (Day Before Characterization)
Cell Inoculation and Incubation (Day Before Characterization)
Inoculate cells with GFP-sacB gene from the cell stock.
Add 5 mL of LB media and 5 µL of the appropriate antibiotic to a Falcon tube.
Incubate the Falcon tube at 37 °C in an incubator.
Sample Preparation (96-well Plate)
Sample Preparation (96-well Plate)
Decide the concentrations of IPTG and sucrose solutions for characterization.
Prepare new Falcon tube(s).
Add 5 mL of M9 media, 5 µL of the appropriate antibiotic, and 100 µL of cells cultured the previous day.
Add the required volume of IPTG to reach the desired concentration.
Incubate the cells for 02:00:00 at 37 °C.
2h
Prepare a sterile 96-well plate.
Design an appropriate plate map, each sample (with a particular IPTG and sucrose concentration) must be repeated 3 times. Example of plate map:
One of the actual plate map used by the NUS-Singapore iGEM 2023 team when characterizing the GFP-sacB gene.
Adjust sucrose concentration by adding DI water and sucrose solution to each well (final volume of 20 µL) according to the plate map.
Add 200 µL of cultured cells to each well already containing DI water and sucrose solution (final well volume of 220 µL).
Add at least 3 wells of 220 µL of M9 media as the blank (negative control).
Characterization and Plate Reader Reading
Characterization and Plate Reader Reading
Place the 96-well plate into the plate reader.
Create a protocol in the plate reader's software according to the following setting: