Part:BBa_K4604037
MazE
In this BioBrick we fused MazE together with a HA-tag using a GS-linker. This HA-tag can be used for protein detection via western blot. Also used and further characterized in BioBricks BBa_K4604035 and BBa_K4604023.
Usage and Biology
Toxin-antitoxin systems (TA-systems) play a crucial role in plasmid stability for naturally occurring plasmids[1]. Usually, the toxin targets essential cellular functions and causes growth arrest or cell death, to which the antitoxin acts as a counterpart. Toxin and antitoxin exhibit differences in their stability and lifespan[2]. While the antitoxin has a shortened lifespan due to its sensitivity to degradation, the toxin has a longer lifespan and is more stable. If the plasmid that contains the TA-system is lost, the antitoxin is rapidly degraded and the toxin concentration increases, leading to cell death. Therefore, when first discovered, TA systems were called “addiction modules” that ensure plasmid retention. The labile MazE (antitoxin) acts as a neutralizer to the stable MazF (toxin), which acts as an endoribonuclease. When MazF is present freely in the cell it cuts cellular RNA which ultimately leads to cell death.
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Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BamHI site found at 89
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
References
[1] Ni S, Li B, Tang K, Yao J, Wood TK, Wang P, et al. Conjugative plasmid-encoded toxin–antitoxin system PrpT/PrpA directly controls plasmid copy number. Proceedings of the National Academy of Sciences of the United States of America [Internet]. 2021 Jan 22;118(4). Available from: https://doi.org/10.1073/pnas.2011577118
[2] Brzozowska I, Zielenkiewicz U. Regulation of toxin–antitoxin systems by proteolysis. Plasmid [Internet]. 2013 Jul 1;70(1):33–41. Available from: https://doi.org/10.1016/j.plasmid.2013.01.007
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