Cyclic diGMP regulates production of sortase substrates of Clostridium difficile and their surface exposure through ZmpI protease-mediated cleavage - Fairweather, NF; Peltier, J; Shaw, HA; Couchman, E; Dawson, LF; Choudhary, JS; LU, Y; Kaever, V; Wren, BW (Journal of Biological Chemistry, 2015)