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Two outer-membrane proteins are involved in the uptake of iron from transferrin by certain Gram-negative bacteria, transferrin-binding proteins 1 and 2. The gene encoding transferrin-binding protein 1 from a serotype 1 isolate of the Gram-negative pathogen Actinobacillus pleuropneumoniae was cloned, and a fragment encoding 700 amino acids of Tbp1 was expressed in Escherichia coli. We also report here sequencing of the tbpl gene and a comparison of the deduced amino acid sequence with Tbpls from related species. The predicted polypeptide product of tbpl is a 106 kDa protein with a 22-residue signal peptide.

Cloning, sequencing and expression of the transferrin-binding protein 1 gene from Actinobacillus pleuropneumoniae