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. 1992 Aug;174(16):5265–5271. doi: 10.1128/jb.174.16.5265-5271.1992

Cloning, characterization, and expression of the dapE gene of Escherichia coli.

J Bouvier 1, C Richaud 1, W Higgins 1, O Bögler 1, P Stragier 1
PMCID: PMC206361  PMID: 1644752

Abstract

The dapE gene of Escherichia coli encodes N-succinyl-L-diaminopimelic acid desuccinylase, an enzyme that catalyzes the synthesis of LL-diaminopimelic acid, one of the last steps in the diaminopimelic acid-lysine pathway. The dapE gene region was previously purified from a lambda bacteriophage transducing the neighboring purC gene (J. Parker, J. Bacteriol. 157:712-717, 1984). Various subcloning steps led to the identification of a 2.3-kb fragment that complemented several dapE mutants and allowed more than 400-fold overexpression of N-succinyl-L-diaminopimelic acid desuccinylase. Sequencing of this fragment revealed the presence of two closely linked open reading frames. The second one encodes a 375-residue, 41,129-M(r) polypeptide that was identified as N-succinyl-L-diaminopimelic acid desuccinylase. The first one encodes a 118-residue polypeptide that is not required for diaminopimelic acid biosynthesis, as judged by the wild-type phenotype of a strain in which this gene was disrupted. Expression of the dapE gene was studied by monitoring amylomaltase activity in strains in which the malPQ operon was under the control of various fragments located upstream of the dapE gene. The major promoter governing dapE transcription was found to be located in the adjacent orf118 gene, while a minor promoter allowed the transcription of both orf118 and dapE. Neither of these two promoters is regulated by the lysine concentration in the growth medium.

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Selected References

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