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2014 - An outer membrane channel protein of Mycobacterium tuberculosis with exotoxin activity

icon pap  Port-a-Patch and   icon vpp   Vesicle Prep Pro publication in Proceedings of the National Academy of Sciences of the United States of America (2014)

Authors: 
Danilchanka A., Sun J., Pavlenok M., Maueröder C., Speer A., Siroy A., Marrero J., Trujillo C., Mayhew D.L., Doornbos K.S., Muñoz 'L.E., HerrmannM., EhrtS., Berens C., Niederweisa M.

 

Journal: 
Proc Natl Acad Sci U S A (2014) 111(18):6750–6755


Abstract: 

The ability to control the timing and mode of host cell death plays a pivotal role in microbial infections. Many bacteria use toxins to kill host cells and evade immune responses. Such toxins are unknown in Mycobacterium tuberculosis. Virulent M. tuberculosis strains induce necrotic cell death in macrophages by an obscure molecular mechanism. Here we show that the M. tuberculosis protein Rv3903c (channel protein with necrosis-inducing toxin, CpnT) consists of an N-terminal channel domain that is used for uptake of nutrients across the outer membrane and a secreted toxic C-terminal domain. Infection experiments revealed that CpnT is required for survival and cytotoxicity of M. tuberculosis in macrophages. Furthermore, we demonstrate that the C-terminal domain of CpnT causes necrotic cell death in eukaryotic cells. Thus, CpnT has a dual function in uptake of nutrients and induction of host cell death by M. tuberculosis.


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