6P2I image
Entry Detail
PDB ID:
6P2I
Title:
Acyclic imino acid reductase (Bsp5) in complex with NADPH and D-Arg
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-05-21
Release Date:
2019-07-24
Method Details:
Experimental Method:
Resolution:
1.63 Å
R-Value Free:
0.19
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glycerate dehydrogenase
Chain IDs:A, B
Chain Length:314
Number of Molecules:2
Biological Source:Bacillus sp. 5mfcol3.1
Primary Citation
An Asymmetric Reductase That Intercepts Acyclic Imino Acids Producedin Situby a Partner Oxidase.
J.Am.Chem.Soc. 141 12258 12267 (2019)
PMID: 31298853 DOI: 10.1021/jacs.9b03307

Abstact

Acyclic imines are unstable in aqueous conditions. For this reason, known imine reductases, which enable the synthesis of chiral amines, mainly intercept stable cyclic imines. Here we report the detailed biochemical and structural characterization of Bsp5, an imino acid reductase from the d-2-hydroxyacid dehydrogenase family that reduces acyclic imino acids produced in situ by a partner oxidase. We determine a 1.6 Å resolution structure of Bsp5 in complex with d-arginine and coenzyme NADPH. Combined with mutagenesis work, our study reveals the minimal structural constraints for its biosynthetic activity. Furthermore, we demonstrate that Bsp5 can intercept more complex products from an alternate oxidase partner, suggesting that this oxidase-imino acid reductase pair could be evolved for biocatalytic conversion of l-amino acids to d-amino acids.

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