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type VI secretion system tube protein Hcp
HCP is a family of proteins which are expressed in up to 1000 copies in Gram-negative bacteria. Together these copies aggregate into a needle-like shaft or tube that will penetrate other bacteria via a puncturing protein attached to its head [1]. Initially Hcp forms a hexameric structure with a central channel of 40 Angstroms. These hexamers pile up one on top of each other forming nanotubes resembling the gp19 tail phage tube [2]. [1]. 24381728. The rise of the Type VI secretion system. Filloux A;. F1000Prime Rep. 2013;5:52. [2]. 16763151. A virulence locus of Pseudomonas aeruginosa encodes a protein secretion apparatus. Mougous JD, Cuff ME, Raunser S, Shen A, Zhou M, Gifford CA, Goodman AL, Joachimiak G, Ordonez CL, Lory S, Walz T, Joachimiak A, Mekalanos JJ;. Science. 2006;312:1526-1530. (from Pfam)
Hcp family type VI secretion system effector
Hcp family type VI secretion system effector acts as a virulence factor, as a transporter of effectors and as a chaperone; it may aggregate into a needle-like shaft that can penetrate other bacteria via a puncturing protein attached to its head
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