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. 1992 Apr;1(4):549–556. doi: 10.1002/pro.5560010410

Characterization of EntF as a serine-activating enzyme.

J Reichert 1, M Sakaitani 1, C T Walsh 1
PMCID: PMC2142219  PMID: 1338974

Abstract

EntF is the enzyme responsible for serine activation during the biosynthesis of enterobactin (a cyclic trimer of N-dihydroxybenzoyl serine) in Escherichia coli. EntF has been overexpressed and purified to > 90% homogeneity. The enzyme has been shown to complement the entF- MK1 strain in the synthesis of 2,3-dihydroxybenzoyl serine derivatives and exhibits L-serine-dependent ATP[32P] pyrophosphate exchange activity with a Km for serine of 260 mM and a turnover number of 760 min-1. Release of PPi during incubation of EntF with serine and ATP was observed, but with a low turnover number of 1.0 min-1. These results suggested the presence of an enzyme-bound intermediate, which has been shown by gel filtration analysis to be (L-serine)adenylate.

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Selected References

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