Information on EC 1.14.11.B15 - S-(L-glutamyl)-[peptidyl-carrier protein]-3-hydroxylase (3-hydroxylating, erythro-hydroxy-L-glutamyl-[peptidyl-carrier-protein]-forming)
for references in articles please use BRENDA:EC1.14.11.B15
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SYSTEMATIC NAME
IUBMB Comments
S-(L-glutamyl)-[peptidyl-carrier protein of nonribosomal peptide synthetase KtzH],2-oxoglutarate:oxygen oxidoreductase (3-hydroxylating, S-(erythro-3-hydroxy-L-glutamyl)-[peptidyl-carrier-protein of nonribosomal peptide synthetase KtzH]-forming)
Substrates: able to hydroxylate glutamic acid bound to a noncognate peptidyl-carrier-protein, e.g. the ninth peptidyl-carrier-protein domain of the CDA NRPS assembly line (CDA-T9). Nonhydrolyzable coenzyme A analogs are developed and used to determine the kinetic parameters for KtzP-catalyzed hydroxylation of glutamic acid bound to the carrier protein. To determine the kinetic parameters of KtzP catalyzed hydroxylation, the problem of the labile thioester bond is circumvented by using synthetic coenzyme A analogs coupled to glutamic acid where the thioester is replaced by a hydrolytically stable amide bond Products: -
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S-(L-glutamyl)-[peptidyl-carrier protein of nonribosomal peptide synthetase KtzH] + 2-oxoglutarate + O2
S-(erythro-3-hydroxy-L-glutamyl)-[peptidyl-carrier-protein of nonribosomal peptide synthetase KtzH] + succinate + CO2
Substrates: the enzyme is involved in the biosynthesis of L-erythro-3-hydroxy-glutamate, a component of kutznerides (antifungal nonribosomal hexadepsipeptides) Products: -
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S-(L-glutamyl)-[peptidyl-carrier protein of nonribosomal peptide synthetase KtzH] + 2-oxoglutarate + O2
S-(erythro-3-hydroxy-L-glutamyl)-[peptidyl-carrier-protein of nonribosomal peptide synthetase KtzH] + succinate + CO2
Substrates: D-Glu, L-Glu and [peptidyl-carrier-protein]-D-glutamyl thioester are not accepted as substrates. Proposed reaction mechanism: the stand-alone adenylation domain KtzN first activates L-glutamic acid as amino acyl adenylate, which then can be transferred site-specifically to the third peptidyl-carrier-protein domain of KtzH. The specificity of this interaction is mediated by the presence of the truncated A domain (A') as well as hydroxylase KtzP. Both A' and a hydroxylase KtzP are required for Glu-AMP transfer. Subsequently, the PCP-bound glutamic acid is hydroxylated by KtzP to afford L-erythro-3-hydroxyglutamic acid Products: -
Substrates: the enzyme is involved in the biosynthesis of L-erythro-3-hydroxy-glutamate, a component of kutznerides (antifungal nonribosomal hexadepsipeptides) Products: -
putative non-heme iron oxygenase, exhibit the conserved HXD/E_H iron(II)-binding motif, in the assay (NH4)2FeSO4 is used as source of the ferrous iron cofactor (0.5 mM)
nonhydrolyzable coenzyme A analogs are developed and used to determine the kinetic parameters for KtzP-catalyzed hydroxylation of glutamic acid bound to the carrier protein. To determine the kinetic parameters of KtzP catalyzed hydroxylation, the problem of the labile thioester bond is circumvented by using synthetic coenzyme A analogs coupled to glutamic acid where the thioester is replaced by a hydrolytically stable amide bond
nonhydrolyzable coenzyme A analogs are developed and used to determine the kinetic parameters for KtzP-catalyzed hydroxylation of glutamic acid bound to the carrier protein. To determine the kinetic parameters of KtzP catalyzed hydroxylation, the problem of the labile thioester bond is circumvented by using synthetic coenzyme A analogs coupled to glutamic acid where the thioester is replaced by a hydrolytically stable amide bond
nonhydrolyzable coenzyme A analogs are developed and used to determine the kinetic parameters for KtzP-catalyzed hydroxylation of glutamic acid bound to the carrier protein. To determine the kinetic parameters of KtzP catalyzed hydroxylation, the problem of the labile thioester bond is circumvented by using synthetic coenzyme A analogs coupled to glutamic acid where the thioester is replaced by a hydrolytically stable amide bond
the enzyme is involved in the biosynthesis of L-erythro-3-hydroxy-glutamate, prior to incorporation into kutznerides (antifungal nonribosomal hexadepsipeptides)
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