Summary
The nucleotide sequence of the melB gene coding for the Na+(Li+)/melibiose symporter of Salmonella typhimurium LT2 was determined, and its amino acid sequence was deduced. It consists of 1428 bp, corresponding to a protein of 476 amino acid residues (calculated molecular weight 52800). The amino acid sequence is homologous to that of the melibiose permease of Escherichia coli K12, with 85% identical residues. All, except one, of the amino acid residues that have been reported to be important for cation or substrate recognition in the melibiose permease of E. coli are conserved in the melibiose permease of S. typhimurium. In addition, part of the sequence resembles the lactose permease of Streptococcus thermophilus, the animal glucose transporter (GLUT1), the plasmid-coded raffinose permease (RafB), and the NADH-ubiquinone oxidoreductase chain 4 (Nuo4) of Aspergillus amstelodami.
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Communicated by J. Lengeler
The nucleotide sequence reported in this paper has been submitted to the DDBJ/GenBank/EMBL Data Bank with accession number X62101
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Mizushima, K., Awakihara, S., Kuroda, M. et al. Cloning and sequencing of the meIB gene encoding the melibiose permease of Salmonella typhimurium LT2. Molec. Gen. Genet. 234, 74–80 (1992). https://doi.org/10.1007/BF00272347
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DOI: https://doi.org/10.1007/BF00272347