Richard Lab:Amplified insert assembly: Difference between revisions

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<center>'''Amplified Insert Assembly'''</center>
<center>'''Amplified Insert Assembly'''</center>
==Overview==
==Overview==
 
This is a lab specific protocol.  For more information on the benefits of Amplified Insert Assembly see the [[Amplified Insert Assembly|consensus protocol]].  A You-Tube [http://www.youtube.ug/watch?v=Tvxx2bL0R2I&context=C3df62b2ADOEgsToPDskIOrrbFVhSy4joiAlQXxIYp video summary of the Amplified Insert Assembly method] provides a quick and entertaining visual introduction.
Amplified Insert Assembly is a method of "BioBricking" two biological parts (i.e. pieces of DNA) together and was developed by [[User:Michael A. Speer|Mike Speer]] and Dr. Tom Richard.  For more information on bio-bricking see [http://partsregistry.org/Help:Contents this link].  This method combines the ease and speed of 3A assembly with the reliability of standard assembly.  In comparison to [[Synthetic Biology:BioBricks/3A assembly|3A assembly]], this method can take up to two hours longer; however, the added time spent at the bench is minimal.  Major benefits of this assembly method over other bio-brick assembly methods include:
 
*no need for [[Richard Lab:Agarose Gel Electrophoresis|gel electrophoresis]] or [[DNA Gel extraction|gel extraction]].
*the ability to insert small (i.e. invisible on a gel) parts.
*no need to use [[Synthetic Biology:BioBricks/3A assembly|multiple antibiotic resistances]].
*no having to make construction vectors.
*really low background (99% of colonies are correct)
**This means less sequencing
*Easy transformation (use homemade competent cells)
*Less culturing
**This is because one plasmid prep can supply many PCR inserts.  So common parts (i.e. promoters and RBSs) can be used over and over again.
 


This protocol is typically used to do bio-brick assembly with restriction sites consisting of the following configuration:
This protocol is typically used to do bio-brick assembly with restriction sites consisting of the following configuration:
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The two parts you want to assemble will be labeled "insert" and "vector" and will be initially contained on separate plasmids.  The eventual goal of assembly is to get these parts on the same plasmid next to one another.
The two parts you want to assemble will be labeled "insert" and "vector" and will be initially contained on separate plasmids.  The eventual goal of assembly is to get these parts on the same plasmid next to one another.
==Materials==
===General===
*Pipettors
*Microcentrifuge
*Water baths
*Thermocycler
*Electroporator
*Selective media plates
===Enzymes===
*EcoRI Restriction Endonuclease
*XbaI Restriction Endonuclease
*SpeI Restriction Endonuclease
*PstI Restriction Endonuclease
*[http://www.neb.com/nebecomm/products/productR0176.asp DpnI] Restriction Endonuclease
*[http://www.neb.com/nebecomm/products/productM0254.asp Vent] DNA Polymerase (or another equivalent high fidelity polymerase)
*[http://www.neb.com/nebecomm/products/productM0289.asp Antarctic Phosphatase]
*T4 Ligase


==Procedure==
==Procedure==


1. [[miniprep|Miniprep]] both "insert" and "vector" from their respective cultures using a [http://www.omegabiotek.com/products.php?CateID=11 kit] or [[Miniprep/GET buffer|this protocol]] (30 mins).<br>
1. [[miniprep|Miniprep]] both "insert" and "vector" from their respective cultures using a [http://www.omegabiotek.com/products.php?CateID=11 kit] or [[Miniprep/GET buffer|this protocol]] (30 mins).<br>
2. PCR the "insert" plasmid (This will take about 2 hrs, but start the vector digest right away while the insert PCR is cycling).  
2. PCR the "insert" plasmid (This will take about 2 hrs, but start the vector digest right away while the insert PCR is cycling).<br>
::*Use a high-fidelity polymerase (e.g. pfu Turbo or Vent).
::*Use a high-fidelity polymerase (e.g. pfu Turbo or Vent).<br>
::*Use the same primers you use for colony PCR (Annealing Temp of 55-60°C).
::*Use the same primers you use for colony PCR (Annealing Temp of 55-60°C).<br>
::*Only run 25-30 cycles as this will help ensure high fidelity.
::*Only run 25-30 cycles as this will help ensure high fidelity.<br>
3. [[Richard Lab:Restriction Digest|Digest]] the "vector" for 2 hours.
3. Start [[Richard Lab:Restriction Digest|Digesting]] the "vector" while the PCR is cycling.<br>
4. Purify the PCR product using a [http://www.omegabiotek.com/products.php?CateID=14 kit] or [[Ethanol precipitation of nucleic acids|this protocol]].
::*For help on deciding which enzymes to use see [[Enzyme selection for BioBricks digest|this page]].
5. [[Richard Lab:Restriction Digest|Digest]] insert for 1 hour (adding DpnI along with the other restriction endonucleases).
4. Purify the PCR product using a [http://www.omegabiotek.com/products.php?CateID=14 kit] or [[Ethanol precipitation of nucleic acids|this protocol]].<br>
6. Add 1μL Antarctic Phosphatase and 6μL AP Buffer to the "vector" digest and incubate until the "insert" digest is done.
5. [[Richard Lab:Restriction Digest|Digest]] insert for 1 hour (adding DpnI along with the other restriction endonucleases).<br>
7. Kill all reactions by incubating for 20 mins at 80°C.
6. Once the insert is digesting add 1μL Antarctic Phosphatase and 6μL AP Buffer to the "vector" digest and incubate until the "insert" digest is done.<br>
8. [[Richard Lab:Ligation|Ligate]] at a molar ratio of 4:1 (insert:vector).
7. Kill all reactions by incubating for 20 mins at 80°C.<br>
9. [[Richard Lab:Electroporation of E. coli|Transform]].
8. [[Richard Lab:Ligation|Ligate]] at a molar ratio of 4:1 (insert:vector).<br>
10. Plate on plates with the same antibiotic as the "vector" resistance.
9. [[Richard Lab:Electroporation of E. coli|Transform]].<br>
10. Plate on plates with the same antibiotic as the "vector" resistance.<br>
11. Celebrate.
11. Celebrate.


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;;#This is why we use a high-fidelity polymerase
;;#This is why we use a high-fidelity polymerase
::#We're sequencing the constructs anyway so we'd spot any mutations.
::#We're sequencing the constructs anyway so we'd spot any mutations.
==References==
*Speer, M.A. and T.L. Richard.  2011.  [http://www.jbioleng.org/content/5/1/17 '''Amplified insert assembly: an optimized approach to standard assembly of BioBrick™ genetic circuits''' ''Journal of Biological Engineering'' 5:17]


==Contact==
==Contact==
*[[user:Michael A. Speer | Mike Speer]]
*This protocol was developed by [[user:Michael A. Speer | Mike Speer]] and [http://www.abe.psu.edu/fac/Richard/Overview.htm Dr. Tom Richard]
*[http://www.abe.psu.edu/fac/Richard/Overview.htm Tom Richard]
*You can also discuss this protocol [[Talk:{{PAGENAME}}|here]].  
or instead, [[Talk:{{PAGENAME}}|discuss this protocol]].  




Latest revision as of 20:48, 22 April 2012

Back to Protocols

Amplified Insert Assembly

Overview

This is a lab specific protocol. For more information on the benefits of Amplified Insert Assembly see the consensus protocol. A You-Tube video summary of the Amplified Insert Assembly method provides a quick and entertaining visual introduction.

This protocol is typically used to do bio-brick assembly with restriction sites consisting of the following configuration:

-----EcoRI--XbaI--Part--SpeI--PstI-----

Ocassionally other enzymes (e.g. BamHI or HindIII) are used to make protein fusions. See our bio-brick format page for more details.

The two parts you want to assemble will be labeled "insert" and "vector" and will be initially contained on separate plasmids. The eventual goal of assembly is to get these parts on the same plasmid next to one another.

Procedure

1. Miniprep both "insert" and "vector" from their respective cultures using a kit or this protocol (30 mins).
2. PCR the "insert" plasmid (This will take about 2 hrs, but start the vector digest right away while the insert PCR is cycling).

  • Use a high-fidelity polymerase (e.g. pfu Turbo or Vent).
  • Use the same primers you use for colony PCR (Annealing Temp of 55-60°C).
  • Only run 25-30 cycles as this will help ensure high fidelity.

3. Start Digesting the "vector" while the PCR is cycling.

  • For help on deciding which enzymes to use see this page.

4. Purify the PCR product using a kit or this protocol.
5. Digest insert for 1 hour (adding DpnI along with the other restriction endonucleases).
6. Once the insert is digesting add 1μL Antarctic Phosphatase and 6μL AP Buffer to the "vector" digest and incubate until the "insert" digest is done.
7. Kill all reactions by incubating for 20 mins at 80°C.
8. Ligate at a molar ratio of 4:1 (insert:vector).
9. Transform.
10. Plate on plates with the same antibiotic as the "vector" resistance.
11. Celebrate.

  • If you already have PCR insert ready to go (i.e. you ran the PCR the night before from old miniprep) then it only takes about 4 hours.

Notes

  • The DpnI eliminates any background from the insert PCR.
  • The phosphatase eliminates any background vector.
  • The "vector" will be digested for a total of thee hours (including nearly one hour with Antarctic Phosphatase)
  • The "insert" will only be digested for one hour. This is okay as there is a lot of it.
  • Detractors of this method may say that it's risky to PCR the inserts because of mutations. We say:
  1. This hasn't been a problem for us.
  2. This is why we use a high-fidelity polymerase
  3. We're sequencing the constructs anyway so we'd spot any mutations.

References

Contact

Back to Protocols

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