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<p>The UV-absorbing nature of Eira CFP makes it suitable as a more readily available reporter color protein, since UV light sources are relatively easier to obtain than other light sources of particular wavelength. Team Tsinghua 2022 has diluted bacteria expressing Eira CFP at different ratios to produce color cards consisting of distinct gradients. This demonstrated the suitability of Eira CFP as a reporter gene.</p>
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                <b>Diluted bacteria under UV light.</b>
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Revision as of 11:00, 13 October 2022

IP-Free EiraCFP (Cyan Fluorescent Protein)

This part was created by DNA 2.0 as part of their IP-Free series of fluorescent and chromogenic proteins. It is available to use under the BioBrick Public Agreement.

  • Excitation 398nm, Emission 498nm
  • Molecular Weight: 26.0kDA
  • Length: 233 amino acids

EireCFP appears colorless to the naked eye, but has a light blue color under UV light.

EireCFP
Excitation and Emission Spectra

Usage and Biology

DNA 2.0 created a poster to show how the parts were created which is available on their site here. The creation of the collection is summarized in the sections below.

About the DNA 2.0 IP-Free Fluorescent Protein Collection

Fluorescent and chromogenic proteins are a valuable tool for research, with uses ranging from reporters in transgenic systems to biosensors. The tangle of intellectual property restrictions, as well as protein characteristics like brightness, spectral properties, oligomeric state and sensitivity to environmental conditions, limits the breadth of tasks to which fluorescent and chromogenic proteins can be applied.

DNA 2.0 has created a large set of new colored and fluorescent proteins by backtranslating a set of sequences from Genbank, using GeneDesigner software to simultaneously minimize sequence differences and match GeneGPS derived E. coli codon bias for high protein expression. Gene fragments were designed to create chimeric genes when pooled. A subset of the resultant chimeras were selected as base genes from which multiple iterations of libraries with targeted substitutions were made. Each reiteration involved characterizing variants for spectral and sequence data which was analyzed to infer correlations between them. Correlations were then tested by creating specific individual sequences and determining whether their spectral properties were as predicted. Three amino acid positions were found to be individually responsible for cyan, green or yellow fluorescence emission. They also identified variants with non-overlapping spectra as candidates for applications using more than one fluorescent protein, for example microscopy and FRET (Fluorescence Resonance Energy Transfer) applications.

The basic approach used by DNA 2.0 to create the collection is described in the figure to the left. Genes encoding the starting proteins were backtranslated using GeneDesigner to simultaneously minimize sequence differences and match a GeneGPS derived E. coli codon bias. Oligonucleotides were designed to synthesize each gene in fragments, and subsets of these gene fragments were combined such that synthesis created chimeric genes. The resultant chimeras were cloned under control of the PTrc or PT5 promoters, and fluorescent colonies were picked under various illuminations. Excitation and emission spectra were recorded from pelleted cells resuspended in a transparent buffer using a fluorescence plate reader.

Other proteins in the collection

Part BBa_J97000 is a member of a collection of four IP-Free fluorescent proteins. The four members of the collection have the following part numbers:

DNA2.0’s IP-Free© synthetic non-aequorea fluorescent proteins are intended to be used as a source of different fluorescent protein coding sequences (genes) that can be amplified by PCR and cloned into any other expression vector of choice.

Protein Collection Images under fluorescent light Protein Collection Excitation and Emission Information

The UV-absorbing nature of Eira CFP makes it suitable as a more readily available reporter color protein, since UV light sources are relatively easier to obtain than other light sources of particular wavelength. Team Tsinghua 2022 has diluted bacteria expressing Eira CFP at different ratios to produce color cards consisting of distinct gradients. This demonstrated the suitability of Eira CFP as a reporter gene.


Diluted bacteria under UV light.

This part was contributed under the BioBrick Public Agreement (BPA). Click on the BioBrick Foundation logo to see more information about the BPA.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]


Functional Parameters

emission498
excitation398