Mike Barnkob:Protocols/Bacterial/Isolate DNA: Difference between revisions
From OpenWetWare
Jump to navigationJump to search
Mike Barnkob (talk | contribs) (New page: ← Front page ==Isolate DNA from bacteria== Diagnostic restriction digest to verify plasmid identity. ===Reagents=== * Restriction enzymes * DNA ladder ===Proto...) |
Mike Barnkob (talk | contribs) No edit summary |
||
Line 3: | Line 3: | ||
==Isolate DNA from bacteria== | ==Isolate DNA from bacteria== | ||
Protocol to isolate bacterial plasmids from overnight liquid cultures. | |||
===Reagents=== | ===Reagents=== | ||
* | * QIAprep Spin Miniprep Kit. | ||
* | * Autoclaved 1.5 mL Eppendorf tubes. | ||
===Protocol=== | ===Protocol=== | ||
# | ''Follows QIAprep Spin Miniprep protocol. Presumes all reagens have been prepared.''<br />'''Note:''' All spins conducted at 13.000 RPM. | ||
# Transfer bacterial culture into 2ml tubes. | |||
# Spin for 3 min in mini-centrifuge. | |||
# Remove supernatant and resuspend pellet in 250 μL Buffer P1 (kept at 4°C). | |||
# Add 250 μL Buffer P2 and mix by inverting tubes 6-10 times, until solution turns blue.<br />'''Note:''' Finish this step in under 5 min. | |||
# Add 350 μL Buffer N3 and mix by inverting tubes 6-10 times, until entire solution turns colorless. | |||
# Spin for 10 min in mini-centrifuge. | |||
# Transfer 750 μL of supernatant to spin column. Let sit for 60 sec minimum. | |||
# Spin spin column for 45 seconds. Discard the flow-through by decanting. | |||
# Add 500 μL Buffer PB and spin for 45 seconds. Discard the flow-through by decanting. | |||
# Add 750 μL Buffer PE and spin for 45 seconds. Discard the flow-through by decanting. | |||
# Transfer spin column to 1.5ml Eppendorf tube. | |||
# Spin for 1 min to remove residual wash buffer. | |||
# Transfer spin column to new 1.5ml Eppendorf tube. | |||
# Add 50 μL Buffer EB (10 mM TrisCL) to the center of the spin column, very close to membrane. Let sit for 60 seconds minimum. | |||
# Spin for 1 min. Flow-through is your DNA. | |||
# Label tubes and store at -20°C | |||
'''Quality control''': | |||
# Add 1.2 μL of DNA to NanoDrop and record concentration, 260/280 and 260/230 ratios. | |||
===References=== | ===References=== | ||
* | * QIAprep Spin Miniprep Kit protocol. |
Latest revision as of 02:48, 22 January 2015
Isolate DNA from bacteria
Protocol to isolate bacterial plasmids from overnight liquid cultures.
Reagents
- QIAprep Spin Miniprep Kit.
- Autoclaved 1.5 mL Eppendorf tubes.
Protocol
Follows QIAprep Spin Miniprep protocol. Presumes all reagens have been prepared.
Note: All spins conducted at 13.000 RPM.
- Transfer bacterial culture into 2ml tubes.
- Spin for 3 min in mini-centrifuge.
- Remove supernatant and resuspend pellet in 250 μL Buffer P1 (kept at 4°C).
- Add 250 μL Buffer P2 and mix by inverting tubes 6-10 times, until solution turns blue.
Note: Finish this step in under 5 min. - Add 350 μL Buffer N3 and mix by inverting tubes 6-10 times, until entire solution turns colorless.
- Spin for 10 min in mini-centrifuge.
- Transfer 750 μL of supernatant to spin column. Let sit for 60 sec minimum.
- Spin spin column for 45 seconds. Discard the flow-through by decanting.
- Add 500 μL Buffer PB and spin for 45 seconds. Discard the flow-through by decanting.
- Add 750 μL Buffer PE and spin for 45 seconds. Discard the flow-through by decanting.
- Transfer spin column to 1.5ml Eppendorf tube.
- Spin for 1 min to remove residual wash buffer.
- Transfer spin column to new 1.5ml Eppendorf tube.
- Add 50 μL Buffer EB (10 mM TrisCL) to the center of the spin column, very close to membrane. Let sit for 60 seconds minimum.
- Spin for 1 min. Flow-through is your DNA.
- Label tubes and store at -20°C
Quality control:
- Add 1.2 μL of DNA to NanoDrop and record concentration, 260/280 and 260/230 ratios.
References
- QIAprep Spin Miniprep Kit protocol.