3A-Assembly -Ligation of 2 Parts Into a Vector

1. PCR step; see PCR protocol
2. Digestion
BSA is only needed for conventional restriction enzymes, NOT fast digest
1. Digest step for Plasmid Backbone

if sample comes from miniprep
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer 2
• 0.5 ul BSA
• 0.5 ul EcoRI-H
• 0.5 ul PstI
• 19 ul dH20 (0,5 ul less when using BSA)

If sample comes from PCR
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer
• 0.5 ul BSA
• 0.5 ul EcoRI-HF
• 0.5 ul PstI
• 0.5 ul DpnI (Used to digest any template DNA from productio
• 19 ul dH20 (0,5 ul less when using BSA

Digest Plasmid Backbone
• Add 4 ul linearized plasmid backbone (25ng/ul for 100ng tota
• Add 4 ul of Enzyme Master Mix
• Digest 37C/30 min, heat kill Restriction Enzyme 80C/20 min


2. Digest step for Insert X:

If sample comes from miniprep
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer
• 0.5 ul BSA
• 0.5 ul EcoRI-HF
• 0.5 ul PstI
• 19 ul dH20 (0,5 ul less when using BSA
If sample comes from PCR
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer
• 0.5 ul BSA
• 0.5 ul EcoRI-HF
• 0.5 ul SpeI
• 0.5 ul DpnI (Used to digest any template DNA from production)
• 19 ul dH20 (0,5 ul less when using BSA)

Digest Plasmid Backbone

• Add 4 ul linearized plasmid backbone (25ng/ul for 100ng total)
• Add 4 ul of Enzyme Master Mix
• Digest 37C/30 min, heat kill Restriction Enzyme 80C/20 min
3. Digest step for Insert Y:
If sample comes from miniprep
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer 2
• 0.5 ul BSA
• 0.5 ul EcoRI-HF
• 0.5 ul PstI
• 19 ul dH20 (0,5 ul less when using BSA)
If sample comes from PCR
Enzyme Master Mix for Plasmid Backbone (25ul total)
• 5 ul Fastdigest greenbuffer / NEB Buffer 2
• 0.5 ul BSA
• 0.5 ul Xbal
• 0.5 ul PstI
• 0.5 ul DpnI (Used to digest any template DNA from production)
• 19 ul dH20 (0,5 ul less when using BSA)

Digest Plasmid Backbone

• Add 4 ul linearized plasmid backbone (25ng/ul for 100ng total)
• Add 4 ul of Enzyme Master Mix
• Digest 37C/30 min, heat kill Restriction Enzyme 80C/20 min
3. Ligation step
• Add 2ul of digested plasmid backbone (25 ng)
• Add 5:1 (Molar, NOT VOLUME)amount of EcoRI-HF SpeI digested fragment (Insert X)(< 3 ul)
• Add 5:1 (Molar, NOT VOLUME) amount of XbaI PstI digested fragment (Insert Y)(< 3 ul)
• Add 2 ul T4 DNA ligase buffer
• Add 0.5 ul T4 DNA ligase
• Add water to 10 ul
• Ligate 16C/30 min, heat kill 80C/20 min
3A Assembly. The part B0034 and C0010 is referred to as X and Y