ExplorEnz: EC 6.3.2.14

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6.3.2.14

Accepted name:

enterobactin synthase

Reaction:

6 ATP + 3 2,3-dihydroxybenzoate + 3 L-serine = enterobactin + 6 AMP + 6 diphosphate

For diagram of enterobactin biosynthesis, click here

Other name(s):

N-(2,3-dihydroxybenzoyl)-serine synthetase; 2,3-dihydroxybenzoylserine synthetase; 2,3-dihydroxybenzoate—serine ligase

Systematic name:

2,3-dihydroxybenzoate:L-serine ligase

Comments:

This enzyme complex catalyses the conversion of three molecules each of 2,3-dihydroxybenzoate and L-serine to form the siderophore enterobactin. In Escherichia coli the complex is formed by EntB (an aryl carrier protein that has to be activated by 4′-phosphopantetheine), EntD (a phosphopantetheinyl transferase that activates EntB), EntE (catalyses the ATP-dependent condensation of 2,3-dihydroxybenzoate and holo-EntB to form the covalently arylated form of EntB), and EntF (a four domain protein that catalyses the activation of L-serine by ATP, the condensation of the activated L-serine with the activated 2,3-dihydroxybenzoate, and the trimerization of three such moieties to a single enterobactin molecule).

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 37318-63-1

References:

1.	Brot, N. and Goodwin, J. Regulation of 2,3-dihydroxybenzoylserine synthetase by iron. J. Biol. Chem. 243 (1968) 510–513. [PMID: 4966114]
2.	Rusnak, F., Faraci, W.S. and Walsh, C.T. Subcloning, expression, and purification of the enterobactin biosynthetic enzyme 2,3-dihydroxybenzoate-AMP ligase: demonstration of enzyme-bound (2,3-dihydroxybenzoyl)adenylate product. Biochemistry 28 (1989) 6827–6835. [PMID: 2531000]
3.	Rusnak, F., Liu, J., Quinn, N., Berchtold, G.A. and Walsh, C.T. Subcloning of the enterobactin biosynthetic gene entB: expression, purification, characterization, and substrate specificity of isochorismatase. Biochemistry 29 (1990) 1425–1435. [PMID: 2139796]
4.	Rusnak, F., Sakaitani, M., Drueckhammer, D., Reichert, J. and Walsh, C.T. Biosynthesis of the Escherichia coli siderophore enterobactin: sequence of the entF gene, expression and purification of EntF, and analysis of covalent phosphopantetheine. Biochemistry 30 (1991) 2916–2927. [PMID: 1826089]
5.	Gehring, A.M., Mori, I. and Walsh, C.T. Reconstitution and characterization of the Escherichia coli enterobactin synthetase from EntB, EntE, and EntF. Biochemistry 37 (1998) 2648–2659. [DOI] [PMID: 9485415]
6.	Shaw-Reid, C.A., Kelleher, N.L., Losey, H.C., Gehring, A.M., Berg, C. and Walsh, C.T. Assembly line enzymology by multimodular nonribosomal peptide synthetases: the thioesterase domain of E. coli EntF catalyzes both elongation and cyclolactonization. Chem. Biol. 6 (1999) 385–400. [DOI] [PMID: 10375542]

[EC 6.3.2.14 created 1972, modified 2012]