Activity of protein MalE (maltose-binding protein) fused to cytoplasmic and periplasmic regions of an Escherichia coli inner membrane protein.
We analysed the properties of mature MBP (maltose-binding protein or MalE protein) fused to an integral cytoplasmic membrane protein of Escherichia coli. Fusion of MalE to the first MalG periplasmic loop enabled a strain defective in the malE gene to utilize maltose. In contrast, fusion of MalE to a cytoplasmic loop did not complement the malE delta 444 deletion. We obtained results highly correlated with those obtained by using alkaline phosphatase as a reporter for the topology of MalG. We discuss the possibility of genetically determining the topology of cytoplasmic membrane proteins by a method based on engineered fusions to MBP.
Dassa
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Unité de Programmation moléculaire et de Toxicologie Génétique, CNRS UA 1444, Institut Pasteur, Paris.
Lambert
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D018528:ATP-Binding Cassette Transporters; D000469:Alkaline Phosphatase / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D003593:Cytoplasm; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D017930:Genes, Reporter; D005816:Genetic Complementation Test; D008320:Maltose / Q000378:metabolism*; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins; D019897:Periplasm; D033902:Periplasmic Binding Proteins; D011993:Recombinant Fusion Proteins
D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; C461619:MalE protein, E coli; C079123:MalG protein, E coli; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins; D009004:Monosaccharide Transport Proteins; D033902:Periplasmic Binding Proteins; D011993:Recombinant Fusion Proteins; C461599:maltose transport system, E coli; D008320:Maltose; D000469:Alkaline Phosphatase