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J Bacteriol. 1988 January; 170(1): 56-64

research-article

Nucleotide sequence of the iucD gene of the pColV-K30 aerobactin operon and topology of its product studied with phoA and lacZ gene fusions.

M Herrero, V de Lorenzo and J B Neilands

Department of Biochemistry, University of California, Berkeley 94720.

ABSTRACT

Gene iucD of the aerobactin operon of the Escherichia coli plasmid ColV-K30 encodes a membrane-bound enzyme synthesizing N6-hydroxylysine, the first product of the aerobactin biosynthesis pathway. The entire nucleotide sequence of the cloned iucD gene was determined, from which the primary and some aspects of the secondary structure of the encoded peptide were deduced. E. coli cells harboring multicopy plasmid pVLN12 (iucD+) hyperproduced an approximately 50-kilodalton peptide which was purified and identified as the product of the gene by examination of its amino-terminal sequence. Two iucD'-'lacZ gene fusions were constructed in vitro and four iucD'-'phoA gene fusions were generated in vivo by mutagenesis of iucD with transposon TnphoA (Tn5 IS50L::phoA). Analysis of the corresponding fusion proteins suggested at least two domains of attachment of the IucD protein to the inner side of the cytoplasmic membrane. The first apparent membrane-bound domain was found within the first 25 amino acids of the protein and showed a sequence which resembled that of the signal peptides.

J Bacteriol. 1988 January; 170(1): 56-64




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