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J Bacteriol. 1987 Aug;169(8):3844-9.

fhuC and fhuD genes for iron (III)-ferrichrome transport into Escherichia coli K-12.


The nucleotide sequence for a 1,900-base-pair region of the Escherichia coli chromosome that includes the genes fhuC and fhuD was determined. Within this sequence are two open reading frames: nucleotides 127 to 921 and nucleotides 924 to 1811. These coding regions specify a FhuC protein with an Mr of 28,423 and a mature FhuD protein with an Mr of 29,610. The deduced amino acid sequence of FhuC shows extensive homology with those of components of some bacterial transport systems which are peripheral proteins of the cytoplasmic membrane. Because the FhuD protein contains a typical signal sequence of 30 amino acids at the amino terminus and displays characteristics of a soluble protein, it may be exported into the periplasm.

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