fwYellow, yellow chromoprotein
This chromoprotein (also known as FezziwigYFP) naturally exhibits strong color when expressed. Compared to many other chromoproteins, such as amilCP (BBa_K592009), amilGFP (BBa_K592010), spisPink (BBa_K1033932), asPink (BBa_K1033933) and aeBlue (BBa_K864401), the color development is slower. The color is readily observed in both LB or on agar plates after 24-64 hours of incubation.
Usage and Biology
This part is useful as a reporter.
iGEM13_Uppsala: Expression of chromoproteins. The images above show E coli constitutively expressing meffRed BBa_K1033922, aeBlue BBa_K1033929, tsPurple BBa_K1033905, asPink (asCP) BBa_K1033927, fwYellow BBa_K1033910, meffBlue BBa_K1033902, meffRed BBa_K1033922 and scOrange BBa_K1033913.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21COMPATIBLE WITH RFC
- 23COMPATIBLE WITH RFC
- 25Illegal AgeI site found at 109
- 1000Illegal SapI.rc site found at 486
Characterization: NWU-China 2019
The NWU-China team overexpressed fwYellow protein in E. coli and extracted and purified. The maximum absorbance was measured in a 96-well plate using a microplate reader (Synergy 2).
At the same time, fwYellow can emit strong fluorescence under blue light excitation.
When we used the microplate reader to measure the excitation light and absorbed light, we found that the spectrum of fwYellow is too narrow. Due to the low precision of the instrument, it is impossible to accurately measure its excitation light and emission light. The excitation light is around 522 nm and the emission is about 536 nm.
Characterization: NWU-CHINA-A 2020
Last year, our college team NWU-China did not measure the specific values of fwYellow excitation light and emission light accurately. This year, the NWU-CHINA-A team overexpressed fwYellow protein in E.coli and extracted and purified again.
After 16 hours of fermentation, we added IPTG to overexpress this chromoprotein and continued to cultivate for three hours. Then we centrifuged the broth by High speed freezing centrifuge (4℃,8000rpm,15min). Added the lysis solution according to the ratio of the bacteria’s wet weight to the lysis solution 100mg:3ml, and broke the cells in the ultrasonic cell disruptor(500w, work 3s,Stop 5s, 20min),then centrifuged again to get the protein supernatant (4℃,8000rpm,15min). The wavelength of excitation light and emission light was measured by fluorospectro photometer(F-4700).
We scaned the 3D diagrams of samples to read the best conditions: Ex=508nm, Em=510nm.
After that, we measured the excitation and emission spectrum of fwYellow. The scanning range of emission spectrum is 420-530nm, and the scanning range of emission spectrum is 490-600nm.
Functional Parameters: Austin_UTexas
Burden Imposed by this Part:
Burden is the percent reduction in the growth rate of E. coli cells transformed with a plasmid containing this BioBrick (± values are 95% confidence limits). This BioBrick did not exhibit a burden that was significantly greater than zero (i.e., it appears to have little to no impact on growth). Therefore, users can depend on this part to remain stable for many bacterial cell divisions and in large culture volumes. Refer to any one of the BBa_K3174002 - BBa_K3174007 pages for more information on the methods, an explanation of the sources of burden, and other conclusions from a large-scale measurement project conducted by the 2019 Austin_UTexas team.
This functional parameter was added by the 2020 Austin_UTexas team.