Enzymes
| UniProtKB help_outline | 1 proteins |
Reaction participants Show >> << Hide
- Name help_outline enterobactin Identifier CHEBI:77805 Charge -1 Formula C30H26N3O15 InChIKeyhelp_outline SERBHKJMVBATSJ-BZSNNMDCSA-M SMILEShelp_outline Oc1cccc(C(=O)N[C@H]2COC(=O)[C@H](COC(=O)[C@H](COC2=O)NC(=O)c2cccc(O)c2[O-])NC(=O)c2cccc(O)c2O)c1O 2D coordinates Mol file for the small molecule Search links Involved in 6 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,264 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline N-(2,3-dihydroxybenzoyl)-L-serine trimer Identifier CHEBI:143020 Charge -1 Formula C30H28N3O16 InChIKeyhelp_outline NTWRWGRCGVKQNS-BZSNNMDCSA-M SMILEShelp_outline C([C@H](CO)NC(=O)C1=C(C(=CC=C1)O)O)(OC[C@@H](C(OC[C@@H](C([O-])=O)NC(=O)C2=C(C(=CC=C2)O)O)=O)NC(=O)C3=C(C(=CC=C3)O)O)=O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:60384 | RHEA:60385 | RHEA:60386 | RHEA:60387 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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In vitro characterization of salmochelin and enterobactin trilactone hydrolases IroD, IroE, and Fes.
Lin H., Fischbach M.A., Liu D.R., Walsh C.T.
The iroA locus encodes five genes (iroB, iroC, iroD, iroE, iroN) that are found in pathogenic Salmonella and Escherichia coli strains. We recently reported that IroB is an enterobactin (Ent) C-glucosyltransferase, converting the siderophore into mono-, di-, and triglucosyl enterobactins (MGE, DGE, ... >> More
The iroA locus encodes five genes (iroB, iroC, iroD, iroE, iroN) that are found in pathogenic Salmonella and Escherichia coli strains. We recently reported that IroB is an enterobactin (Ent) C-glucosyltransferase, converting the siderophore into mono-, di-, and triglucosyl enterobactins (MGE, DGE, and TGE, respectively). Here, we report the characterization of IroD and IroE as esterases for the apo and Fe(3+)-bound forms of Ent, MGE, DGE, and TGE, and we compare their activities with those of Fes, the previously characterized enterobactin esterase. IroD hydrolyzes both apo and Fe(3+)-bound siderophores distributively to generate DHB-Ser and/or Glc-DHB-Ser, with higher catalytic efficiencies (k(cat)/K(m)) on Fe(3+)-bound forms, suggesting that IroD is the ferric MGE/DGE esterase responsible for cytoplasmic iron release. Similarly, Fes hydrolyzes ferric Ent more efficiently than apo Ent, confirming Fes is the ferric Ent esterase responsible for Fe(3+) release from ferric Ent. Although each enzyme exhibits lower k(cat)'s processing ferric siderophores, dramatic decreases in K(m)'s for ferric siderophores result in increased catalytic efficiencies. The inability of Fes to efficiently hydrolyze ferric MGE, ferric DGE, or ferric TGE explains the requirement for IroD in the iroA cluster. IroE, in contrast, prefers apo siderophores as substrates and tends to hydrolyze the trilactone just once to produce linearized trimers. These data and the periplasmic location of IroE suggest that it hydrolyzes apo enterobactins while they are being exported. IroD hydrolyzes apo MGE (and DGE) regioselectively to give a single linear trimer product and a single linear dimer product as determined by NMR. << Less
J. Am. Chem. Soc. 127:11075-11084(2005) [PubMed] [EuropePMC]
This publication is cited by 9 other entries.