Difference between revisions of "Part:BBa K1074004"

Latest revision as of 23:22, 25 January 2015

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

If you are an iGEM team, you must submit a Check-In before acquiring and using this part! See the 2021 Safety Page for more information.

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