Difference between revisions of "Part:BBa K592100"

Revision as of 22:38, 21 September 2011

Blue Fluorescent Protein (mTagBFP)

This part codes for the bright blue fluorescent protein mTagBFP. mTagBFP is a monomeric protein with a narrow fluorescence emission spectrum with a maximum at 456 nm. It has a tyrosine-based chromophore, giving it substantially higher brightness, faster chromophore maturation and higher pH stability than blue fluorescent proteins with a histidine in the chromophore. Subach et. al. started with a red fluorescent protein (TagRFP) and converted it to a bright blue monomeric protein. See the article listed in source. The sequence has been codon optimized for expression in E coli by DNA 2.0.

Subach et. al. reported the following data:

Excitation peak: 399 nm. Emission peak: 456 nm. Maturation Half-Time (min): 13. Relative brightness to EBFP2: 1.82. Extinction Coefficient (M-1 cm-1): 52000. Quantum Yield: 0.63.

Usage and Biology

This part is useful as a reporter. The excitation peak at 399 nm makes it well suited for use in flow cytometers using a 407 nm violet laser such as the FACSAria II, and the emission peak at 456 works well with a DAPI filter (band pass 450/40).

The images above show E coli constitutively expressing mTagBFP BBa_K592100 (blue) and YFP BBa_K592101 (yellow) illuminated on a UV table.

References

[http://www.ncbi.nlm.nih.gov/pubmed/18940671] Subach, O. M., I. S. Gundorov, et al. (2008). "Conversion of red fluorescent protein into a bright blue probe." Chem Biol 15(10): 1116-24.

Sequence and Features