Part:BBa_K1074004
Safety Flag
The iGEM Safety and Security Committee has placed a Red Flag on this part. This part presents safety risks beyond what is normal for the Registry. Researchers who plan to acquire and use this part should take special care to ensure they use it safely and responsibly. Contact safety [AT] igem [DOT] org with any questions.
Reason: Virulence factor
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Protective Antigen Domain 4
Protective antigen (PA) is the central component of the three-part protein toxin secreted by Bacillus anthracis, the organism responsible for anthrax. Homologues of PA have been found in several spore-forming Gram-positive bacteria, and share the ability to translocate toxic enzymes into the host cytosol.The PA monomer is organised mainly into antiparallel beta-sheets and has four domains: an N-terminal domain (domain 1) containing two calcium ions and the cleavage site for activating proteases; a heptamerisation domain (domain 2) containing a large flexible loop implicated in membrane insertion; a small domain of unknown function (domain 3); and a carboxy-terminal receptor-binding domain (domain 4) [PMID: 9039918].
This entry represents domain 4 of PA, which has an immunoglobulin-like fold. Domain 4 plays a key role in cellular receptor recognition, as well as in pH-dependent pore formation[PMID: 19722284].
Sequence and Features
- 10INCOMPATIBLE WITH RFC[10]Illegal SpeI site found at 361
- 12INCOMPATIBLE WITH RFC[12]Illegal SpeI site found at 361
- 21COMPATIBLE WITH RFC[21]
- 23INCOMPATIBLE WITH RFC[23]Illegal SpeI site found at 361
- 25INCOMPATIBLE WITH RFC[25]Illegal SpeI site found at 361
- 1000COMPATIBLE WITH RFC[1000]
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