1887

Abstract

Pulse–chase labelling was used to study the role of the cell wall microenvironment in the functioning of PrsA, an extracellular lipoprotein and member of the parvulin family of peptidylprolyl /-isomerases. It was found that in protoplasts, and thus in the absence of a cell wall matrix, the post-translocational folding, stability and secretion of the AmyQ -amylase were independent of PrsA, in contrast to the strict dependency found in rods. The results indicate that PrsA is dedicated to assisting the folding and stability of exported proteins in the particular microenvironment of the cytoplasmic membrane–cell wall interface, possibly as a chaperone preventing unproductive interactions with the wall. The data also provide evidence for a crucial role of the wall in protein secretion. The presence of the wall directly or indirectly facilitates the release of AmyQ from the cell membrane and affects the rate of the signal peptide processing.

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2003-03-01
2024-04-19
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