Difference between revisions of "Part:BBa K331030"

 
 
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<partinfo>BBa_K331030 short</partinfo>
 
<partinfo>BBa_K331030 short</partinfo>
  
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This is <partinfo>BBa_K331022</partinfo> with the tetracycline repressible promoter <partinfo>BBa_R0040</partinfo> added in front.  
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This is <partinfo>BBa_K331022</partinfo> - which is a yellow fluorescent protein (<partinfo>E0030</partinfo>) fused to a N-terminal 9x Arginine Tag (<partinfo>K249005</partinfo>) preceded by a ribosomal binding site (<partinfo>B0034</partinfo>) - under the control of the tetracycline repressible promoter <partinfo>BBa_R0040</partinfo>.  
  
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This will be a component of a proof-of-concept part That will show localization of proteins into the interior of a microcompartment formed by the assembly of lumazine synthase proteins.  
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This will be a component of a proof-of-concept part designed to show the localization of proteins into the interior of a microcompartment formed by the assembly of lumazine synthase (<partinfo>K249002</partinfo>) proteins.  
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===Usage and Biology===
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<partinfo>BBa_K331030 parameters</partinfo>
 
<partinfo>BBa_K331030 parameters</partinfo>
 
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In order to further characterize the C-terminal and N-terminal oligoarginine tag (BioBricks <html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K249005" target="new"><font color="#00DC00">BBa_K249005</font></a></html> and <html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K249004" target="new"><font color="#00DC00">BBa_K249004</font></a></html> respectively) and investigate the effect their placement on protein stability, yellow fluorescent proteins (YFP) with the oligoarginine fused to either the C-terminus (<html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K331023" target="new"><font color="#00DC00">BBa_K331023</font></a></html>) or N-terminus (<html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K331022" target="new"><font color="#00DC00">BBa_K331022</font></a></html>) (and preceded by a ribosomal binding site – <html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_B0034" target="new"><font color="#00DC00">BBa_B0034</font></a></html>) were synthesized. We used our <html><a href="http://2010.igem.org/Team:Lethbridge/Notebook/Protocols#Assembly_of_BioBricks_using_the_Red.2FWhite_3-Antibiotic_Assembly_Method"><font color="#00DC00"> Red/White 3-Antibiotic assembly method</font></a></html> to add a tetracycline repressible promoter (<html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_R0010" target="new"><font color="#00DC00">BBa_R0040</font></a></html>) for constitutive expression of the fusion protein. This addition generated BioBricks <html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K331031" target="new"><font color="#00DC00">BBa_K331031</font></a></html> and <html><a href="https://parts.igem.org/wiki/index.php/Part:BBa_K331030" target="new"><font color="#00DC00">BBa_K331030</font></a></html> for the C-terminal tagged and N-terminal tagged YFP respectively.
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===Method===
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The BioBrick containing plasmid was transformed into <i>Escherichia coli</i> DH5&alpha; cells. These cells were grown to an OD<sub>600</sub> of approximately 0.7, and diluted 1:10 with MilliQ H2O immediately prior to analysis by fluorescent spectroscopy.
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<br><br>
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This dilution of cells was excited at 517 nm, and the emission spectra was read from 522 nm to 650 nm. Fluorescence at 524 nm (emission maxima of YFP) of control cells (<i>Escherichia coli</i> DH5&alpha;), N-terminal tagged, and C-terminal tagged YFP were compared.
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<br><br>
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===Results===
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N-terminal tagged YFP did not have substantially more fluorescence than control cells. Cells expressing C-terminal tagged YFP had ten times more fluorescence than control cells and cells expressing N-terminal tagged YFP.
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<table border="0" cellpadding="8"  width="28%">
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<img src="https://static.igem.org/mediawiki/parts/3/3e/UofLNvsC-YFP1.jpg" width="450"/>
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</th>
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<img src="https://static.igem.org/mediawiki/parts/6/62/UofLNvsC-YFP2.jpg" width="450"/>
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</th>
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</tr>
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</table>
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</body>
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</center>
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</html>
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===Conclusion===
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Our results are consistent with the data reported by Bachmair <i>et al.</i> in that the placement of arginine residues at the N-terminus of our YFP results in no observable fluorescence over control cells. Assuming that transcription of this K331030 and K331031 are equivalent, these data suggest that the N-terminal oligoarginine is reducing the half-life of the protein to which it is fused, ie YFP.
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<br><br>
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===Reference===
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<sup>1</sup>Bachmair A., Finley D., Varshavsky A. (1986), <b>In Vivo Half-Life of a Protein Is a Function of Its Amino-Terminal Residue.</b> <i>Science</i> 234. <b>4773</b> 179-186.

Latest revision as of 00:17, 29 October 2010

Tet Repressible N-terminal Arg Tagged EYFP (no terminator)

This is BBa_K331022 - which is a yellow fluorescent protein (BBa_E0030) fused to a N-terminal 9x Arginine Tag (BBa_K249005) preceded by a ribosomal binding site (BBa_B0034) - under the control of the tetracycline repressible promoter BBa_R0040.

This will be a component of a proof-of-concept part designed to show the localization of proteins into the interior of a microcompartment formed by the assembly of lumazine synthase (BBa_K249002) proteins.

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]



In order to further characterize the C-terminal and N-terminal oligoarginine tag (BioBricks BBa_K249005 and BBa_K249004 respectively) and investigate the effect their placement on protein stability, yellow fluorescent proteins (YFP) with the oligoarginine fused to either the C-terminus (BBa_K331023) or N-terminus (BBa_K331022) (and preceded by a ribosomal binding site – BBa_B0034) were synthesized. We used our Red/White 3-Antibiotic assembly method to add a tetracycline repressible promoter (BBa_R0040) for constitutive expression of the fusion protein. This addition generated BioBricks BBa_K331031 and BBa_K331030 for the C-terminal tagged and N-terminal tagged YFP respectively.

Method

The BioBrick containing plasmid was transformed into Escherichia coli DH5α cells. These cells were grown to an OD600 of approximately 0.7, and diluted 1:10 with MilliQ H2O immediately prior to analysis by fluorescent spectroscopy.

This dilution of cells was excited at 517 nm, and the emission spectra was read from 522 nm to 650 nm. Fluorescence at 524 nm (emission maxima of YFP) of control cells (Escherichia coli DH5α), N-terminal tagged, and C-terminal tagged YFP were compared.

Results

N-terminal tagged YFP did not have substantially more fluorescence than control cells. Cells expressing C-terminal tagged YFP had ten times more fluorescence than control cells and cells expressing N-terminal tagged YFP.

Conclusion

Our results are consistent with the data reported by Bachmair et al. in that the placement of arginine residues at the N-terminus of our YFP results in no observable fluorescence over control cells. Assuming that transcription of this K331030 and K331031 are equivalent, these data suggest that the N-terminal oligoarginine is reducing the half-life of the protein to which it is fused, ie YFP.

Reference

1Bachmair A., Finley D., Varshavsky A. (1986), In Vivo Half-Life of a Protein Is a Function of Its Amino-Terminal Residue. Science 234. 4773 179-186.