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Team:HKU HongKong/Data/Mol Protocols.html
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Revision as of 15:48, 23 September 2012
Team:HKU HK
From 2011.igem.org
Molecular Cloning Protocols
Transforming Competent E.coli with the
Plasmid:
We chose the biobrick K137076 to
ligate to the pvdQ gene for the following reasons:
-
Take out the competent E-coli cells from the -80 freezer. (Keep all tubes on ice).
-
Add 1uL of the plasmid DNA in 100uL competent cells (if from Kit). For transformation of ligated product, add 10uL of the ligated plasmid DNA in 100uL competent
cells.
-
Incubate on ice for 10 min.
-
Place in water bath at 42°C for 90s.
-
Place immediately back on ice for at least 2 min.
-
Add 800uL LB broth. Incubate for 1hr at 37°C shaker.
-
Centrifuge at 130rpm for 5min to remove supernatant. Re-suspend the pellet in about 10uL of supernatant.
-
Spread the entire re-suspended pellet on ampicillin agar dishes.
-
Incubate for 12-16 hours at 37 °C.
Notes:
- Colonies grown on plate were selected for colony PCR screening.
- Correct colonies were then cultured in 5 mL LB Broth with 0.5uL ampicillin for subsequent screening or mass culturing.
- Mass culturing involved adding 200uL of the culture into 35mL LB Broth with 35uL ampicillin.
Miniprep to Extract the Plasmid from E.coli (QIAprep Spin Miniprep Kit):
-
Transfer some of the 5mL bacterial culture into a microcentrifuge tube. Pellet by centrifugation at 13,500 rpm for 1 min. Repeat till all the culture has been pelleted.
-
Resuspend the pellet in 250uL Buffer P1.
-
Add 250uL Buffer P2 (Lysis Buffer). Mix thoroughly by inverting the tube 4-6 times. Do not allow prolonged lysis.
-
Immediately add 350uL Buffer N3 (Neutralization Buffer). Mix immediately by inverting the tube.
-
Centrifuge for 10 minutes at 13,500 rpm.
-
Apply the resulting supernatant to the QIAprep spin column by pipetting. Centrifuge for 1 minute at 13,500 rpm.
-
Wash the QIAprep spin column by applying 0.75mL Buffer PE. Centrifuge for 1 minute at 13,500 rpm.
-
Centrifuge for an additional 1 minute to remove residual ethanol.
-
Place the QIAprep spin column in microcentrifuge tube. Elute DNA by adding 50uL warm H2O.
-
Centrifuge for 1 minute at 13,500 rpm.
Midiprep for Large Volumes of Culture (QIAGEN Plasmid Midi Kit):
Refer to the QIAGEN website for the protocol.
PCR Amplification of Gene from Bacterial Genome/Standard Biobrick Parts
37.5μL ddH2O
5.0μL 10x PCR Buffer
2.5μL dNTPs
1.0μL Forward Primer (Prefix)
1.0μL Reverse Primer (Suffix)
1.0μL Template DNA
1.0 μL RTaq DNA Polymerase
50.0μL Total
Note:
-
The
volume of DNA used in the second PCR reaction depends on the
concentration of the DNA after the PCR Clean-up.
PCR Clean-Up –
Qiagen QIAquick PCR Purification:
Add 5 volumes of Buffer PB to 1 volume of PCR mix.
Place this mix within the QIAquick column. Centrifuge at 13,500 rpm
for 1 minute.
Discard flow through and centrifuge again to allow all the sample to
pass through.
Wash with 750uL Buffer PE. Centrifuge at 13,500 rpm for 1 minute.
Discard flow through and centrifuge again to remove all residual
buffer.
Place the column in a micro centrifuge tube.
Apply 50uL of pre-warmed distilled H2O to the column. Stand for at
least 2 minutes.
Centrifuge at 13,500 rpm for 1 minute.
Colony PCR
14.52μL ddH2O
2.0μL 10x PCR Buffer
1.6μL dNTPs
0.4μL Forward Primer (Prefix)
0.4μL Reverse Primer (Suffix)
1.0μL Template DNA
0.08μL RTaq DNA Polymerase
20.0μL Total
Notes:
-
The
mixture was pipetted into PCR tubes
-
All
materials were kept on ice
-
Colonies will inoculated into 5uL broth prior to PCR
-
Prefix and Suffix were used as Forward and Reverse Primers respectively
while amplifying standard biobrick parts
-
PCR
Reaction: 95°C - 10 min
95°C - 30 sec
57°C - 30 sec (appropriate annealing
temperature for prefix and suffix)
72°C - 30 sec
(28 cycles all together)
72°C - 5 min
Agarose Gel Electrophoresis
Prepare a 2% or 1% Agarose Gel (amount in grams depending on volume
of TAE buffer used). Add 0.1% Ethidium Bromide of the total volume.
Place the gel in the Electrophoresis Apparatus with the wells facing
the Negative Electrode.
Fill the apparatus with 1% TAE Buffer to fully submerge the wells.
Load 5µL of 1kb Ladder for each Run
Add 0.1% of 10% Loading Dye to the respective volume of sample. Mix
well and spin down.
Pipette the samples into the wells and run at 106 Volts.
Exercise the DNA fragment from the Agarose Gel using a scalpel.
Minimize the extra peripheral gel slice.
Weigh the
gel slice (0.1g = 100uL) and add 3 Volumes of Buffer QG to every 1
Volume of Gel.
Incubate in 50°C water bath for 10 minutes to completely dissolve
the gel slice.
Add 1 Volume of
Isopropanol to the sample. Mix well
Apply the sample
to the QIAquick column. Centrifuge at 13,500 rpm for 1 minute.
[Repeat till the total volume of the sample has sieved through the
column]. Discard the flow through
Apply
0.5mL Buffer QG to the QIAquick column. Centrifuge at 13,500 rpm for
1 minute.
Discard the flow
through
Wash the column
with 0.75mL Buffer PE. Centrifuge at 13,500 rpm for 1 minute.
Discard the flow
through and Centrifuge at 13,500 rpm for an additional 1 minute to
eliminate any residual ethanol.
Place the QIAquick column into a 1.5mL Eppendorf tube.
Apply the
30uL warm H2O to the column. Let the column stand for at
least 1 minute.
Centrifuge at
13,500 rpm for 1 minute.
Determining DNA Concentration Using NanoDrop Spectrophotometry
Choose the Nucleic Acid Measurement option in the programme.
Initialize the NanoDrop by adding 1uL clean H2O. Clean
the sensor gently with tissue.
Set Blank by adding an additional 1uL of clean H2O. Wipe
off.
Add 1uL of the DNA sample to be measured. Wipe off after each run.
DNA Digestion
__μL
ddH2O (to a total of 40uL)
4μL 10X NEBuffer
0.4μL 100X BSA
1ug
DNA Sample
__μL
1st Restriction Enzyme
__μL
2nd Restriction Enzyme (optional)
40μL Total
Notes:
-
The NEB official website should be checked for buffers suitable for each
restriction enzyme. Results can vary depending on double or single
digestion.
-
Incubate the digestion sample at 37°C for 3 hours (digestion time can
also vary depending on enzyme). Prolonged digestion may lead to Star
Activity otherwise.
-
The
volume of DNA must be calculated from its concentration. In restriction
digestion test, the minimum volume that is equals 1ug DNA can be
utilized. However, for purification, a much greater volume of DNA should
be used.
-
Appropriate amount of enzyme is derived from its concentration and the
fact that 5 units of enzyme digest 1ug DNA.
Dephosphorylation of 5' Ends of Vector Backbone
-
Add
0.5µL (0.5 units per 1 ug DNA) of Calf Intestinal Alkaline Phosphatase (CIAP)
to the digested sample
immediately after digestion.
-
Incubate at 37°C for 30 minutes
Vector-Insert Ligation
__μL
Autoclaved ddH2O (to a total of 20uL)
2μL T4 Ligase Buffer
1μL
T4 DNA Ligase
__μL Vector DNA
__μL
Insert DNA
20μL Total
Notes:
-
Insert and Vector must be in a 3:1 ratio. The amount of each depends on
their concentration (ng/uL) and legnth (bp).
-
Incubate
at room temperature for 1 hour.
PCR Deletion (Site-Directed Mutagenesis) Reaction
Note:
Keep everything on ice and add all volumes in a PCR tube.
?
µL ddH2O (? = whatever volume needed to bring the total volume up to
50µL)
5.0μL 10x PfuUltra buffer
1.0μL dNTPs
?
uL forward primer = 125ng fwd primer ÷ fwd primer concentration (ng/µL)
?
uL reverse primer = 125ng rvs primer ÷ rvs primer concentration (ng/µL)
?
µL dsDNA= 20ng insert ÷ insert concentration (ng/µL)
1.0μL
PfuUltra high-fidelity DNA polymerase
50.0μL Total
-
Volumes of diluted primer based on calculations for our ng/µL
concentrations
95°C for 30sec (18 times)
55°C for 30sec
72°C for 1 min/kb
1min/kb corresponds to: 3.20min (RFP), 3.50min (VioA), 5.40min (VioB),
3.00min (VioE)
- For sequential PCR reactions: After the first PCR is complete, perform
PCR clean-up. Then use the product to conduct the second PCR reaction,
after which gel purification needs to be carried out.
Gel
Purification of DNA (Qiagen QIAquick Gel Extraction Kit)
95°C for 2min
