4W4T image
Entry Detail
PDB ID:
4W4T
Keywords:
Title:
The crystal structure of the terminal R domain from the myxalamid PKS-NRPS biosynthetic pathway
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2014-08-15
Release Date:
2015-08-12
Method Details:
Experimental Method:
Resolution:
1.85 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:MxaA
Chain IDs:A, B
Chain Length:420
Number of Molecules:2
Biological Source:Stigmatella aurantiaca
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
Comprehensive Structural and Biochemical Analysis of the Terminal Myxalamid Reductase Domain for the Engineered Production of Primary Alcohols.
Chem.Biol. 22 1018 1029 (2015)
PMID: 26235055 DOI: 10.1016/j.chembiol.2015.06.022

Abstact

The terminal reductase (R) domain from the non-ribosomal peptide synthetase (NRPS) module MxaA in Stigmatella aurantiaca Sga15 catalyzes a non-processive four-electron reduction to produce the myxalamide family of secondary metabolites. Despite widespread use in nature, a lack of structural and mechanistic information concerning reductive release from polyketide synthase (PKS) and NRPS assembly lines principally limits our ability to redesign R domains with altered or improved activity. Here we report crystal structures for MxaA R, both in the absence and, for the first time, in the presence of the NADPH cofactor. Molecular dynamics simulations were employed to provide a deeper understanding of this domain and further identify residues critical for structural integrity, substrate binding, and catalysis. Aggregate computational and structural findings provided a basis for mechanistic investigations and, in the process, delivered a rationally altered variant with improved activity toward highly reduced substrates.

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