TY  - JOUR
A1  - Beitzinger, Christoph
A1  - Stefani, Caroline
A1  - Kronhardt, Angelika
A1  - Rolando, Monica
A1  - Flatau, Gilles
A1  - Lemichez, Emanuel
A1  - Benz, Roland
T1  - Role of N-Terminal His6-Tags in Binding and Efficient Translocation of Polypeptides into Cells Using Anthrax Protective Antigen (PA)
N2  - It is of interest to define bacterial toxin biochemical properties to use them as molecular-syringe devices in order to deliver enzymatic activities into host cells. Binary toxins of the AB7/8-type are among the most potent and specialized bacterial protein toxins. The B subunits oligomerize to form a pore that binds with high affinity host cell receptors and the enzymatic A subunit. This allows the endocytosis of the complex and subsequent injection of the A subunit into the cytosol of the host cells. Here we report that the addition of an N-terminal His6-tag to different proteins increased their binding affinity to the protective antigen (PA) PA63-channels, irrespective if they are related (C2I) or unrelated (gpJ, EDIN) to the AB7/8-family of toxins. His6-EDIN exhibited voltage-dependent increase of the stability constant for binding by a factor of about 25 when the trans-side corresponding to the cell interior was set to 270 mV. Surprisingly, the C. botulinum toxin C2II-channel did not share this feature of PA63. Cell-based experiments demonstrated that addition of an N-terminal His6-tag promoted also intoxication of endothelial cells by C2I or EDIN via PA63. Our results revealed that addition of His6-tags to several factors increase their binding properties to PA63 and enhance the property to intoxicate cells.
KW  - Biologie
Y1  - 2012
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/6589
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-76325
ER  -