Team:Carnegie Mellon/Protocols


How we did the things we did.

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His-Tag Soluble Protein Extraction
  1. Centrifuge 1.5 ml of culture for 1min full speed at 15000 rpm.
  2. Remove supernatant.
  3. Add 250 µl of extraction buffer (1% octyl-beta-thioglucoside in 10mM Tris-Cl, pH7.5).
  4. Incubate at room temperature for 10 min.

Wash Beads
  1. Remove 50 µl of Ni-NTA in 10 mM Trischloride bead solution and place in new tube for each purification.
  2. Add 1 mL buffer (see table).
  3. Centrifuge at 800 rpm for 30 seconds.
  4. Remove supernatant.
  5. Repeat 3 times and resuspend in 1 mL of Bead Wash Solution.

    • Seen below is the protocol we standardized and distributed to labs like the Citizen Science Center in an effort to gain more uniformity between data observed in different labs around the world. The back of the card has details on how to elute the protein off on the washed Ni-NTa beads. A download link for the JPEG can be found below the images.



Minipreps of MACH Cells Expressing Flourescence
Purpose: To isolate plasmid DNA from MACH cells.


  1. Set up overnight cultures for miniprep.
  2. Make the following reaction recipe:
    • 5 mL LB
    • 5 µL Chlorophenical
    • 1 µL overnight colony
  3. Incubate in 37°C for 16-18 hours.
  4. Follow the Life Technologies Miniprep Kit Protocol.
Restriction Enzyme Digestl
Restriction Enzyme Digest
  1. Prepare the following restriction enzyme digestion solution for J23108, J23109, J23111.
  2. Reagent Amount (µL)
    10X Fast Digest Buffer 2
    Plasmid DNA 12
    Restriction Enzyme XbaI 1
    Restriction Enzyme SpeI 1
    Water (to bring up to volume) 2
    Total Volume 18
  3. Digest at 37 °C for 1 hour.
  4. Follow the Life Technologies Restriction Enzyme Digest Protocol.
Agarose Gel Electrophoresis
Aragose Gel Electrophoresis
  1. 1% aragose gel made of:
      50 mL 0.5X TAE
      0.5g agarose
      2.5 µL ethidium bromide
  2. Run at 114V.
Gel Extraction
Gel Extraction
  1. Make 250-750 µl binding buffer (depending on mass of gel cut-out).
  2. Incubated at 42℃ until gel is melted.
  3. Follow Thermo Scientific's GeneJET Gel Extracton Protocol
  1. Make the following ligation reaction.
  2. Reagent Amount (µL)
    Promoter DNA 1
    Insert DNA 7
    Ligation Buffer 1
    Ligation Enzyme 1
    Total Volume 10
  3. Ligate for 10 minutes at room temperature.
  4. Put on ice until ready for transformation.
  1. Follow iGEM's Transformation Protocol