Difference between revisions of "Golden Gate Assembly protocol"

Revision as of 18:54, 6 September 2011

Protocol to insert new promoter made from oligos into pSB1A2 with insert BBa_J100028

First, you need to dilute your assembled oligos. To do this, dilute them 200 fold.
The easiest way to do this is to remove 2 µL from the 20 µL overnight mixture and place this 2 µL into a new, small microfuge tube.
Now add 398 µL water to the 2 µL of cooled, annealed ologs. Mix this by stirring the tube with a yellow tip.

Get two new, small microfuge tubes designed to fit into the PCR machine.
One tube will be labeled "ligation", the other "plasmid only". Also put your initials on the tubes.


1 µL diluted oligos cooled overnight (use water instead for plasmid only tube)
9 µL ligations mixture provided by your instructor.
use the promoter DNA for the ligation tube but use only water for the plasmid only tube.

Ligation mixture contains:
1 µL (10-20 ng) plasmid containing part J100028
5 µL dH₂O
1 µL 10X Promega Ligase Buffer
1 µL 500 mM NaCl
0.5 µL Bsa I high fidelity (HF) restriction enzyme
0.5 µL T4 DNA Ligase
9 µL final volume

Turn on the PCR machine. Put both of your tubes into the machine.
Program it for the following cylces:
40 cycles of 37C for 1 minutes/16C for 1 minutes
1 cycle of 37C for 5 minutes
22C holding temperature
This DNA ligation is ready for transformation.

Transformations
Use all 10 µL of the ligations for a transformation.
You will also want to perform a transformation positive control using K315008 which contains pLacI+RBS+RFP in plasmid pSB1A2.

Take one tube of 100 µL competent cells and use 30 µL of cells for each of the three transformations listed above. Plate all three transformations on LB amp plates.

This protocols was developed at MWSU by Dr. Todd Eckdahl, and modified at Davidson College by students in Biology 111 and Romina Clemente.