title: Linker mutagenesis in the gene encoding the periplasmic maltose-binding protein of E. coli.
abstract: A plasmid carrying the malE gene, coding for the periplasmic maltose-binding protein of E. coli, was submitted to random mutagenesis by the insertion of a BamHI linker. About 25% of the clones recovered had acquired a BamHI site in the gene malE. Most of the linker insertions were accompanied by small deletions with an average size of 30 base pairs. Among 21 mutants synthesizing a stable maltose binding protein, 8 were still able to grow on maltose. A preliminary analysis of these mutants indicates that certain regions of the protein may not be essential for maltose transport.
mesh_terms: D018528:ATP-Binding Cassette Transporters; D002352:Carrier Proteins / Q000235:genetics*; D004262:DNA Restriction Enzymes; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D005796:Genes; D005798:Genes, Bacterial; D008040:Genetic Linkage; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins / Q000235:genetics*; D009004:Monosaccharide Transport Proteins; D009154:Mutation; D033902:Periplasmic Binding Proteins; D010957:Plasmids
chemical_list: D018528:ATP-Binding Cassette Transporters; D002352:Carrier Proteins; D004251:DNA Transposable Elements; D029968:Escherichia coli Proteins; C461619:MalE protein, E coli; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins; D009004:Monosaccharide Transport Proteins; D033902:Periplasmic Binding Proteins; C461599:maltose transport system, E coli; D004262:DNA Restriction Enzymes