Fig. 6

Alkaline phosphatase activity of E. coli dsbA ⁻ cells expressing the lumenal region of PDI8. PhoA activities were measured from cell lysates obtained from the dsbA ⁺ strain RI89 (wild-type; WT), the untransformed dsbA ⁻ strain RI90, and RI90 cells transformed with either the pFLAG-CTS empty vector (+EV) or the pFLAG-PDI8^abb’ construct (+PDI8). The values are averages of three independent trials, with error bars representing standard deviations