Difference between revisions of "Part:BBa K1399003"
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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 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] | 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] | ||
| − | [[File:EDiGEM14-SsrA degron mediated degradation.png|300px|thumb|right|'''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 | + | [[File:EDiGEM14-SsrA degron mediated degradation.png|300px|thumb|right|'''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]. | 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=== | ===References=== | ||
Latest revision as of 22:20, 15 October 2014
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]
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).
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- 25INCOMPATIBLE WITH RFC[25]Illegal AgeI site found at 555
Illegal AgeI site found at 667 - 1000COMPATIBLE WITH RFC[1000]