Part:BBa_K249005:Experience

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UNIQ98c13fd6578053fc-partinfo-00000000-QINU

BBa_K249005 Adam Smith

This part was sequenced Sept. 13/2010 by the University of Lethbridge iGEM team. The composition of this part is (by sequencing) K249026 (aka Theophylline Riboswitch).

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UNIQ98c13fd6578053fc-partinfo-00000002-QINU

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.