Nano Archive

Carbon nanotubes inhibit the hemolytic activity of the pore-forming toxin pyolysin

Donkor, Apraku David and Su, Zhengding and Mandal, Himadri S. and Jin, Xu and Tang, Xiaowu Shirley (2009) Carbon nanotubes inhibit the hemolytic activity of the pore-forming toxin pyolysin. Nano Research, 2 (7). pp. 517-525. ISSN 1998-0124 (Print) 1998-0000 (Online)


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Functionalized carbon nanotubes have already demonstrated great biocompatibility and potential for drug delivery. We have synthesized acid oxidized and non-covalently PEGlyated single-walled carbon nanotubes (SWNTs), which were previously prepared for drug delivery purposes, and explored their potential for detoxification in the bloodstream. Our investigations of the binding of SWNTs to a pore-forming toxin pyolysin show that SWNTs prevented toxin-induced pore formation in the cell membrane of human red blood cells. Quantitative hemolysis assay and scanning electron microscopy were used to evaluate the inhibition of hemolytic activity of pyolysin. According to Raman spectroscopy data, human red blood cells, unlike HeLa cells, did not internalize oxidized SWNTs. Molecular modeling and circular dichroism measurements were used to predict the 3-D structure of pyolysin (domain 4) and its interaction with SWNTs. The tryptophan-rich hydrophobic motif in the membrane-binding domain of pyolysin, a common construct in a large family of cholesterol-dependent cytolysins, shows high affinity for SWNTs.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:8367
Deposited By:JNCASR
Deposited On:29 Apr 2010 11:17
Last Modified:29 Apr 2010 11:17

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