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. 1988 Oct 1;255(1):35–43. doi: 10.1042/bj2550035

Nucleotide sequence of the gene encoding the GMP reductase of Escherichia coli K12.

S C Andrews 1, J R Guest 1
PMCID: PMC1135187  PMID: 2904262

Abstract

(1) The nucleotide sequence of a 1991 bp segment of DNA that expresses the GMP reductase (guaC) gene of Escherichia coli K12 was determined. (2) This gene comprises 1038 bp, 346 codons (including the initiation codon but excluding the termination codon), and it encodes a polypeptide of Mr 37,437 which is in good agreement with previous maxicell studies. (3) The sequence contains a putative promoter 102 bp upstream of the translational start codon, and this is immediately followed by a (G + C)-rich discriminator sequence suggesting that guaC expression may be under stringent control (4) The GMP reductase exhibits a high degree of sequence identity (34%) with IMP dehydrogenase (the guaB gene product) indicative of a close evolutionary relationship between the salvage pathway and the biosynthetic enzymes, GMP reductase and IMP dehydrogenase, respectively. (5) A single conserved cysteine residue, possibly involved in IMP binding to IMP dehydrogenase, was located within a region that possesses some of the features of a nucleotide binding site. (6) The IMP dehydrogenase polypeptide contains an internal segment of 123 amino acid residues that has no counterpart in GMP reductase and may represent an independent folding domain flanked by (alanine + glycine)-rich interdomain linkers.

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Selected References

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