Stanford/BIOE44:Module 1:Day1
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M1: Day 1 - Plasmid Extraction and Restriction Digest
Introduction
- plasmids
- mini preps - purpose of each step
- parts
- restriction enzymes
- components of a digest
Before Class
- Please read:
In Class
Part 1: Plasmid extraction (aka miniprep)
At the beginning of class you will be given a 5mL culture of E. coli harboring a plasmid that contains a BioBrick part. We will extract the plasmid from the bacteria using a kit (QIAPrep Spin Miniprep kit). Then we'll measure the concentration of the plasmid DNA extracted using a nanodrop spectrophotometer.
Mini-Prep Protocol
Collect the Cells
- Label three microcentrifuge tubes.
- Pour approx. 1.5 mL of culture into each tube.
- Centrifuge at 10000xg for 5 minutes.
- Aspirate off supernatant. Be care to not suck up your cell pellet.
Break the cells open
- Resuspend the cells in tube #1 with 250uL of Buffer P1.
- Transfer all liquid from tube #1 to tube #2 and resuspend the pellet.
- Repeat from tube #2 to tube #3. (Should end up with all the cells in tube #3. Throw away tubes 1 and 2)
- Add 250uL of Buffer P2 to cells. Invert the tube 4-6 times.
Part 2: Restriction Enzyme Digest
We will take the plasmid we just extracted and set up a restriction digest to cut the part out of the plasmid.
For Next Time
- Please read: