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Regulation of glycerol and maltose uptake by the IIAGlc-like domain of IINag of the phosphotransferase system inSalmonella typhimurium LT2
Authors:J van der Vlag  P W Postma
Institution:1. E.C. Slater Institute, BioCentrum, University of Amsterdam, Plantage Muidergracht 12, 1018, TV Amsterdam, The Netherlands
Abstract:InEnterobacteriaceae the nonphosphorylated form of IIAG1c of the phosphoenolpyruvate-dependent phosphotransferase system (PTS) can inhibit the uptake and subsequent metabolism of glycerol and maltose by binding to, and inhibiting, glycerol kinase and the Ma1K protein of the maltose transport system, respectively. In this report we show that the IIAGlc-Iike domain of the membrane-bound IIN-acetylglucosamine (IINag) of the PTS can replace IIAGlc in aSalmonella typhimurium crr mutant strain that lacks all soluble IIAGlc. The inhibition was most severe in cells which were partially induced for the glycerol or maltose up take systems. TheStreptococcus thermophilus lactose transporter LacS, which also contains a IIAGlc-like domain, could not replace IIAGlc. Neither IINag nor LacS could replace IIAGlc in activation of adenylate cyclase.
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