PMID:2656658
| Citation |
Bell, PJ, Andrews, SC, Sivak, MN and Guest, JR (1989) Nucleotide sequence of the FNR-regulated fumarase gene (fumB) of Escherichia coli K-12. J. Bacteriol. 171:3494-503 |
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| Abstract |
The nucleotide sequence of a 3,162-base-pair (bp) segment of DNA containing the FNR-regulated fumB gene, which encodes the anaerobic class I fumarase (FUMB) of Escherichia coli, was determined. The structural gene was found to comprise 1,641 bp, 547 codons (excluding the initiation and termination codons), and the gene product had a predicted Mr of 59,956. The amino acid sequence of FUMB contained the same number of residues as did that of the aerobic class I fumarase (FUMA), and there were identical amino acids at all but 56 positions (89.8% identity). There was no significant similarity between the class I fumarases and the class II enzyme (FUMC) except in one region containing the following consensus: Gly-Ser-Xxx-Ile-Met-Xxx-Xxx-Lys-Xxx-Asn. Some of the 56 amino acid substitutions must be responsible for the functional preferences of the enzymes for malate dehydration (FUMB) and fumarate hydration (FUMA). Significant similarities between the cysteine-containing sequence of the class I fumarases (FUMA and FUMB) and the mammalian aconitases were detected, and this finding further supports the view that these enzymes are all members of a family of iron-containing hydrolyases. The nucleotide sequence of a 1,142-bp distal sequence of an unidentified gene (genF) located upstream of fumB was also defined and found to encode a product that is homologous to the product of another unidentified gene (genA), located downstream of the neighboring aspartase gene (aspA). |
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| Keywords |
Aconitate Hydratase/genetics; Amino Acid Sequence; Bacterial Proteins/genetics; Bacterial Proteins/ultrastructure; Base Sequence; Cloning, Molecular; Codon; DNA, Bacterial/genetics; Escherichia coli/genetics; Fumarate Hydratase/genetics; Genes; Genes, Bacterial; Molecular Sequence Data; Restriction Mapping; Solubility |
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