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BACKGROUND The inner membrane-anchored periplasmic folding factor PpiD is described as a parvulin-like peptidyl prolyl isomerase (PPIase) that assists in the maturation of the major beta-barrel outer membrane proteins (OMPs) of Escherichia coli. More recent work however, calls these findings into question. Here, we re-examined the role of PpiD in the E.(More)
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