Summary: Two components of the maltose transport system, maltoporin (OmpM) and an osmotically shockable periplasmic maltose-binding protein (MBP) were identified. The synthesis of OmpM (apparent 43000) and transport of maltose into cells of were induced by maltose and maltodextrins. A mutant lacking OmpM was drastically impaired in maltose transport, independent of induction by maltose. The MBP of (apparent 40000) was found in the osmotic shock fluid. Its synthesis was induced by maltose. Moreover, rabbit antibodies raised against the MBP of cross-reacted with the analogous protein from . The MBP of restored the maltose transport activities in Δ mutant cells of


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