Not Released
Experience: Works
Not Used
Get This Part
Coding

Part:BBa_K1399003

Designed by: Anna Stikane   Group: iGEM14_Edinburgh   (2014-09-19)

RFP from Discosoma striata (coral) with DAS-ssrA degradation tag



Mutant RFP from Discosoma striata (coral) (Part:BBa_E1010) with added SsrA-DAS degradation tag (Part:Ba_M0052). The tag increases RFP turn-over rate, thus providing better temporal resolution of red fluorescence. In the same time, maximal fluorescence amplitudes will be lower as newly formed protein is degraded as soon as it is formed. The tag encodes peptide sequence AANDENYADAS and is recognized by ClpA and ClpX unfoldases and ClpX mediator SspB.[1] ClpA and ClpX then form a proteosome-like complex with ClpP protease and the protein is degraded (Figure 1).[1]

Figure 1 SsrA degron mediated protein degradation. (A) Any version of SsrA tags can be attached to any protein of interest (e.g. RFP or GFP). (B) The tag is recognized by ClpX unfoldase forming a complex with ClpP protease and the tagged protein gets degraded.

The final three residues of the tag determines the strength of interaction with ClpX and thus the final protein degradation rate.[2] The DAS tag is reported to have low affinity to ClpX thus its mediated degradation very much depends on the concentration of SspB (ClpX mediator).[1] However, be aware that exact protein degradation rate is influenced by multiple other factors: ClpXP and ClpAP protease concentrations, protein stability, Km of binding to the protease, temperature [3].

References

[1] Flynn, J. M. et al. Overlapping recognition determinants within the ssrA degradation tag allow modulation of proteolysis. Proc. Natl. Acad. Sci. U. S. A. 98, 10584–9 (2001). [2] Andersen, J. B. et al. New unstable variants of green fluorescent protein for studies of transient gene expression in bacteria. Appl. Environ. Microbiol. 64, 2240–6 (1998). [3] Purcell, O., Grierson, C. S., Bernardo, M. Di & Savery, N. J. Temperature dependence of ssrA-tag mediated protein degradation. J. Biol. Eng. 6, 10 (2012).

Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal AgeI site found at 555
    Illegal AgeI site found at 667
  • 1000
    COMPATIBLE WITH RFC[1000]
[edit]
Categories
//cds/reporter/chromoprotein
//chassis/prokaryote/bsubtilis
//chassis/prokaryote/ecoli
//function/reporter
//function/reporter/fluorescence
Parameters
abs
biology
colorRed
directionForward
emission607
emit607
excitation584
excite584
kegg
lum
proteinmRFP1
swisspro
tagSsrA-DAS degradation tag