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The toxin-coregulated pilus (TCP) of Vibrio cholerae and thesoluble TcpF protein that is secreted via the TCP biogenesis apparatus are essential for intestinal colonisation in the disease of cholera. TcpQ is part of an outer membrane complex of the TCP biogenesis apparatus, comprised of TcpC and TcpQ, and the TcpQ is required for proper localisation of TcpC to the outer membrane. The domain is found in other Proteobacterial species apart from Vibrio.
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