SuperFolder GFP Expression Plasmid Product


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SuperFolder GFP Expression Plasmid Product


SuperFolder GFP is a highly engineered robustly folded version of GFP that shows greater tolerance to chemical denaturants and extreme temperatures with improved folding kinetics. The SuperFolder GFP DNA allows a test protein to be expressed as an N-terminal fusion with SuperFolder GFP. SuperFolder GFP fluorescence is naffected by the fusion 1 partner misfolding or solubility and is directly proportional to the amount of expressed protein.


Components Supplied:
SuperFolder GFP Plasmid in TE buffer: 100ng store at -20oC.
Note: The stability of the components included in this kit is approximately 6 months when stored at -20oC. When stored properly, the reagents are stable until the date indicated either on the box or each component. Depending on the particular usage requirements, it may be appropriate to re-aliquot reagents to smaller working volumes to avoid repeated freeze-thawing or repeated pipetting from the same vial.

Materials required, but not supplied:

  • Competent expression cells (BL2/DE3)
  • Kanamycin
  • IPTG (Isopropyl β-D-1-thiogalactopyranoside)
  • LB growth media and plates
  • NdeI And BamH1 restriction enzymes
  • Ligation materials
  • Metal affinity column
  • TNG Buffer (50mM Tris pH 7.4, 0.1M NaCl, 10% glycerol)
  • Bovine serum albumin
  • Plasmid Isolation Reagents
  • 96 well plate
  • 4 C refrigerator
  • -20 C freezer
  • Incubator
  • Centrifuge(s) and appropriate size tubes
  • Sonicator
  • Microplate fluorescence reader
  • Vortex mixer
  • Water bath
  • Graduated cylinders and assorted beakers
  • Pipettes and tips
  • Disposable gloves

A. Preparation of Insert DNA:

    • Prior to performing the assay, carefully read all instructions.
  1. Perform plasmid prep and/or PCR. Use standard materials/protocol not included.
  2. Using standard protocol, create a 3’Nde1 sticky end.
  3. Optional: Purify digest fragment from agarose gel.

B. Preparation of SuperFolder DNA:

  1. To ensure that you have a renewable source of plasmid DNA, transform the plasmid vector in an E.coli host strain.
    •  It is recommended that bacterial frozen stocks be prepared of all transformed plasmids using standard molecular biology techniques.
  2. Purify plasmid DNA for cloning using Plasmid Preparation kits or other techniques (not included).
  3. Perform restriction enzyme digest of the SuperFolder plasmid using Nde1 and BamH1 to excise and prepare the SuperFolder DNA. Follow the manufacturer’s instructions for use of the enzymes. Leave sticky ends in preparation for ligation
  4. Optional: Dephosphorylate the digest to decrease non-recombinant background. Use molecular grade calf intestinal or shrimp alkaline phosphatase according to the manufacturer’s directions.
  5. Perform ligation reaction according to manufacturers’ instructions.
  6. Store DNA at –20o C until used.

 C. Clone DNA Insert as an N-terminal Fusion into a Secondary Vector:

  1. Ligate the DNA insert with the digested SuperFolder DNA using standard DNA ligation protocol and manufacturer’s protocol resulting in a plasmid containing the SuperFolder fusion. 
  2. Transform the SuperFolder-fusion plasmid in an expression host for high yields of quality plasmid. Use standard methods based on the screening host used. 
  3. Identify the SuperFolder- positive clones using standard methods. Note: IPTG / X-gal screening is effective in the first 24 hours post plating as the T7 promoter is highly active and absorbs resources from the LacZ gene (positive colonies will fluoresce under long wavelength UV light). 
  4. Perform plasmid DNA purification, sequence to verify reading frame, or use in vitro transcription/translation.

D. Detection:

  1. SuperFolder fluoresces at 490nm excitation with emission at 510nm.
  2. Live cultures can be directly observed, by direct fluorescence of colonies, by microscopy or by flow cytometry.
  3. Purified protein fusions can be detected by fluorimiter, a fluorescent plate reader or by fluorescence spectrometer.



  • Detailed sequence information is available on request.

SuperFolder GFP Plasmid

  • Flanking Sequences of SuperFolder GFP C6HIS and internal restriction sites.
  • Engineering and characterization of SuperFolder GFP is described in: Pedelacq JD, Cabantous S, Tran T, Terwilliger TC, Waldo GS (2006) Engineering and characterization of a SuperFolder green fluorescent protein. Nature Biotechnology 24: 79-88.

Flanking sequences:

SuperFolder Sequence


Restriction Site(s) Occurrences Position(s)
XhoI 1 5493
TspRI 1 5102
TspGWI 2 5203,5585
TspDTI 1 5319
TatI 2 5348,5497
StyI 1 5238
SmlI 2 5493,5733
SfaNI 1 5168
SalI 1 5675
SacI 1 5779
PpuMI 1 5383
NlaIV 2 5384,5594
NdeI 1 5071
NcoI 1 5238
MscI 1 5243
MnlI 2 5154,5159
MluI 1 5394
MfeI 1 5632
MboII 3 5097,5478,5598
Hpy8I 2 5522,5677
Hpy188III 3 5295,5324,5733
HphI 5 5142,5181,5187,5189,5430
HincII 1 5677
Hin4I 2 5476,5508
HgaI 1 5402
FokI 1 5784
EcoO109I 1 5383
EcoICRI 1 5777
Eco57MI 2 5119,5422
Eco57I 1 5422
EaeI 1 5241
DrdI 1 5724
DraI 1 5462
Cac8I 1 5398
BtgI 1 5238
BstZ17I 1 5522
BstYI 1 5699
BstF5I 1 5777
BstBI 1 5694
BsrI 2 5102,5225
BsrGI 1 5348
BspEI 1 5294
Bsp1286I 2 5146,5779
BsmFI 2 5091,5396
BslI 1 5294
BsiHKAI 1 5779
BseYI 1 5751
BseR 1 5176
BsaWI 1 5294
BsaJI 1 5238
BpuEI 1 5754
BpmI 1 5119
Bme1580I 1 5146
BceAI 2 5325,5545
BbvI 1 5735
BanII 1 5779
BamHI 1 5787
BaeI 1 5413
BaeI 1 5446
AvaI 1 5493
ApoI 3 5148,5205,5569
AlwI 3 5305,5694,5782
AflIII 1 5394
AclI 1 5581
AccI 2 5521,5676


Pédelacq et. al. “Engineering and characterization of a SuperFolder green fluorescent protein,” Nature Biotechnology 24, 79 - 88 (2005)
Cava et. al. “Expression and use of SuperFolder green fluorescent protein at high temperatures in vivo: a tool to study extreme thermophile biology.” J Environmental microbiology 10(3):605 2008 Mar.
Andrews et. al. “The Rough Energy Landscape of SuperFolder GFP Is Linked to the Chromophore,” Journal of Molecular Biology, Volume 373, Issue 2, 19 October 2007, Pages 476-490
Waldo et al. "Rapid protein-folding assay using green fluorescent protein," Nature Biotechnology 17, 691 - 695, July 1999.
Cabantous et. al. “New molecular reporters for rapid protein folding assays.” PLoS ONE 3(6) 2008

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