5KVQ image
Entry Detail
PDB ID:
5KVQ
Keywords:
Title:
NADP+ bound structure of Irp3, a Thiazolinyl Imine Reductase from Yersinia enterocolitica
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-07-15
Release Date:
2016-09-21
Method Details:
Experimental Method:
Resolution:
1.45 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Irp3 protein
Chain IDs:A, B
Chain Length:385
Number of Molecules:2
Biological Source:Yersinia enterocolitica
Primary Citation
Holo Structure and Steady State Kinetics of the Thiazolinyl Imine Reductases for Siderophore Biosynthesis.
Biochemistry 55 5423 5433 (2016)
PMID: 27601130 DOI: 10.1021/acs.biochem.6b00735

Abstact

Thiazolinyl imine reductases catalyze the NADPH-dependent reduction of a thiazoline to a thiazolidine, a required step in the formation of the siderophores yersiniabactin (Yersinia spp.) and pyochelin (Pseudomonas aeruginosa). These stand-alone nonribosomal peptide tailoring domains are structural homologues of sugar oxidoreductases. Two closed structures of the thiazolinyl imine reductase from Yersinia enterocolitica (Irp3) are presented here: an NADP(+)-bound structure to 1.45 Å resolution and a holo structure to 1.28 Å resolution with NADP(+) and a substrate analogue bound. Michaelis-Menten kinetics were measured using the same substrate analogue and the homologue from P. aeruginosa, PchG. The data presented here support the hypothesis that tyrosine 128 is the likely general acid residue for catalysis and also highlight the phosphopantetheine tunnel for tethering of the substrate to the nonribosomal peptide synthetase module during assembly line biosynthesis of the siderophore.

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