Methods
1、Ligation Independent Cloning (LIC) Procedure:
Part I:
- design primers of the expression vector and the target sequence.
- PCR amplification to get the target sequence and the expression vector.
- Gel purify the PCR produces using standard methods.
Part II: T4 DNA Polymerase Treatment of vector and PCR Inserts:
- Use about 0.037 pmoles of vector per 20μl reaction.
- Use 0.12-0.48 pmoles of gel purified PCR-insert per 20 μl reaction. Gel purification of PCR-products is necessary to decrease the background of non-specific products.
Make Vector and Insert Mixes:
a.Vector Mix: 1X
T4 Buffer 2 μl
DTT (100mM) 1 μl
T4 Polymerase 0.4 μl
dGTP 2 μl
ddH2O fill to make 20ul
b.Insert Mix : 1X
T4 Buffer 2 μl
DTT (100mM) 1 μl
T4 Polymerase 0.4 μl
dCTP 2 μl
ddH2O fill to make 20 μl
Part III: Annealing vector to insert
- Spin down samples.
- Mix 5μl vector with 5μl insert.
- Incubate at 22°C for 5 min.
- Add 2.5μl EDTA (25 mM) and mix well.
- Incubate at 22°C for 5 min.