MurrayRM:PURExpress system notes and experience

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(New page: Notes on using the NEB PURExpress system. == Worked example: inducible expression == To illustrate how the system works, this section describes an experiment to test out four different c...)
(Worked example: inducible expression)
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* PG1 (BBa_I2035) - GFP with a LacI-repressible promoter on a plasmid (fluoresce)
* PG1 (BBa_I2035) - GFP with a LacI-repressible promoter on a plasmid (fluoresce)
* LG2 (T7-Plac:RBS:GFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from BBa_I2035  (fluoresce)
* LG2 (T7-Plac:RBS:GFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from BBa_I2035  (fluoresce)
-
* LG2 + LG3 (T7:RBS:lacI) - linear GFP on a LacI-repressible promoter with linear lacI on a constitutive promoter (not fluoresce)
+
* LG2 + PG3 (T7:RBS:lacI) - linear GFP on a LacI-repressible promoter with lacI on a constitutive T7 promoter on a plasmid (not fluoresce)
-
* LG2 + LG3 + 100  uM IPTG - GFP on a LacI-repressible promoter with lacI and IPTG present  (fluoresce)
+
* LG2 + PG3 + 100  uM IPTG - GFP on a LacI-repressible promoter with lacI and IPTG present  (fluoresce)
-
In addition, an RFP-based construct was developed, just in case I couldn't get access to BBa_I2035:
+
In addition, an RFP-based construct was developed, just in case I couldn't get access to BBa_I2035 and a constitutive T7-based lacI using a biobrick part:
-
* LR4 (T7-Plac:TBS:RFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from plasmid provided by Karsten Temme at UCSF  (fluoresce)
+
* LR4 (T7-Plac:RBS:RFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from plasmid provided by Karsten Temme at UCSF. This can be used as a replacement for LG2, if needed.
 +
* LG5 (T7-RBS:lacI) - linear DNA with with LacI on a constitutive T7 promoter, constructed from BBa_2043.  This can be used as a replacement for PG3, if needed.
=== DNA construction ===
=== DNA construction ===
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Only the BBa_I2035 plasmid is in the form needed for use with the PURE system.  The other sequences were constructed using PCR-based editing.
Only the BBa_I2035 plasmid is in the form needed for use with the PURE system.  The other sequences were constructed using PCR-based editing.
 +
<blockquote>
==== PG1 ====
==== PG1 ====
This construct is part of the biobricks library and will be obtained from freezer stocks at Stanford (e-mail to Drew on 12 Feb confirming existence).
This construct is part of the biobricks library and will be obtained from freezer stocks at Stanford (e-mail to Drew on 12 Feb confirming existence).
 +
</blockquote>

Revision as of 13:53, 12 February 2010

Notes on using the NEB PURExpress system.

Worked example: inducible expression

To illustrate how the system works, this section describes an experiment to test out four different constructs:

  • PG1 (BBa_I2035) - GFP with a LacI-repressible promoter on a plasmid (fluoresce)
  • LG2 (T7-Plac:RBS:GFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from BBa_I2035 (fluoresce)
  • LG2 + PG3 (T7:RBS:lacI) - linear GFP on a LacI-repressible promoter with lacI on a constitutive T7 promoter on a plasmid (not fluoresce)
  • LG2 + PG3 + 100 uM IPTG - GFP on a LacI-repressible promoter with lacI and IPTG present (fluoresce)

In addition, an RFP-based construct was developed, just in case I couldn't get access to BBa_I2035 and a constitutive T7-based lacI using a biobrick part:

  • LR4 (T7-Plac:RBS:RFP) - linear DNA with GFP on a LacI-repressible promoter, PCR'd from plasmid provided by Karsten Temme at UCSF. This can be used as a replacement for LG2, if needed.
  • LG5 (T7-RBS:lacI) - linear DNA with with LacI on a constitutive T7 promoter, constructed from BBa_2043. This can be used as a replacement for PG3, if needed.

DNA construction

Only the BBa_I2035 plasmid is in the form needed for use with the PURE system. The other sequences were constructed using PCR-based editing.

PG1

This construct is part of the biobricks library and will be obtained from freezer stocks at Stanford (e-mail to Drew on 12 Feb confirming existence).

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