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From 2012.igem.org

Contents 1 Protocols 1.1 Chemo-competent cells 1.2 pGEM Ligation 1.3 Ligation 1.4 Chemotransformation 1.5 Restriction digest 1.6 PCR 1.7 Gel electrophoresis 1.8 LB medium 1.9 SOB medium

Protocols

Chemo-competent cells

pGEM Ligation

Ligation for TA-cloning of PCR products

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

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

Ligation

Ligation for digested parts and vectors.

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

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

Chemotransformation

Component	Volume
chemo-competent E. coli	100µl
plasmid DNA	up to 10µl (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 at least for 1 hour.

Restriction digest

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

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	-	4°C (program finished)

Gel electrophoresis

incl. TAE-Puffer

LB medium

incl. Agarplatten

SOB medium