Figure 6

Phosphodiesterase activity. In vitro phosphodiesterase activity assays compared the abilities of the purified STM0551-6xHis, FimY-6xHis, and STM0551E49A-6xHis proteins to cleave the specific substrate, bis (p NPP). Release of p-nitrophenol was determined at 410 nm. * p<0.05.