Abstract
The signal-transducing protein EIIA(Glc), a component of the phosphoenolpyruvate-glucose phosphotransferase system, plays a key role in carbon regulation in enteric bacteria, such as Escherichia coli and Salmonella typhimurium. The phosphorylation state of EIIA(Glc) governs transport and metabolism of a number of carbohydrates. When glucose as preferred carbon source is transported, EIIA(Glc) becomes predominantly unphosphorylated and allosterically inhibits several permeases, including the maltose ATP-binding cassette transport system (MalFGK2) in a process termed "inducer exclusion." We have mapped the binding surface of EIIA(Glc) that interacts with the MalK subunits by using synthetic cellulose-bound peptide arrays like pep scan- and substitutional analyses. Three regions constituting two binding sites were identified encompassing residues 69-79 (I), 87-91 (II), and 118-127 (III). Region III is MalK-specific, whereas residues from regions I and II partly overlap but are not identical to the binding interfaces for interaction with glycerol kinase and lactose permease. These results were fully verified by studying the inhibitory effect of purified EIIA(Glc) variants carrying mutations at positions representative of each of th...Continue Reading
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