Team:Tuebingen/NotebookProtocols

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Protocols

Contents

Chemo-competent cells

pGEM Ligation

Ligation for TA-cloning of PCR products

Component Volume
2X Rapid Ligation Buffer 5 µl
pGEM vector 0.5 µl (25ng)
PCR product 3.5 µl
T4 DNA ligase 1 µl (3 Weiss units)

Mix all reagents in a 0.5 ml tube. Incubate reaction at 4°C over night.


Ligation

Ligation for digested parts and vectors

Component Volume
10X T4 DNA Ligase Buffer 1 µl
vector DNA 1 µl (20-100 ng)
insert DNA 5 µl (up to 5:1 molar ratio insert to vector)
T4 DNA ligase 1 µl (1 unit)
water 2.5 µl

Mix all reagents and incubate at 22°C for 1 hour.


Chemotransformation

Component Volume
chemo-competent E. coli 100 µl
plasmid DNA up to 10 µl (max. 1/10 of volume)
  1. Add plasmid DNA to cell culture.
  2. Incubate for 30 min on ice.
  3. Heat shock for 90 sec at 42°C.
  4. Add 900 µl LB.
  5. Let the bacteria grow at 37°C for at least 1 hour.


Restriction digest

control digest

Component Volume
Tango buffer 10x 1 µl
XbaI (RE) 0.5 µl
SpeI (RE) 0.5 µl
DNA 1 µl (up to 1 µg)
water 7 µl
  1. Incubate at least for 1 hour at 37°C.

preparative double digest

plasmid linearization

PCR

Component Volume
Taq/Pfu buffer 5 µl
Taq/Pfu polymerase 1 µl
primer forward 0.5 µl (100 pmol/µl)
primer reverse 0.5 µl (100 pmol/µl)
dNTPs 2.5 µl (200 µM)
template DNA 1 µl
water 36 µl

PCR conditions

Step Duration Settings
1 2 min 94°C
2 45 sec 94°C
3 30 sec gradient or annealing temperature
4 90 sec 72°C
steps 2-4: 30 cycles
5 7 min 72°C
6 (hold) 4°C


Gel electrophoresis

TAE buffer 50x

Component Volume
0.05 M EDTA 18.61 g
1 M acetic acid 60.05 g
2 M Tris 242.28 g
water 1 l

Adjust to pH 8.5.

Gel

Component Volume
TAE 1x buffer 120 ml
Agarose 1.2 g

Solve agarose in TAE 1x buffer and boil until solution is clear.

Well loading

Component Volume
PCR product or DNA 5 µl
Loading dye 6x 1 µl

Can be scaled up linearly.

LB medium

incl. Agarplatten


SOB medium

Genaxxon Plasmid DNA Purification Mini Prep Kit

Genaxxon Gel Extraction Mini Prep Kit

Genaxxon PCR DNA Purification Mini Prep Kit

Qiagen Plasmid Midi Kit