Crystal structure of a mycobacterium aldo-keto reductase in its apo and liganded form

Experimental Data Snapshot

  • Resolution: 1.64 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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Crystal Structure and Comparative Functional Analyses of a Mycobacterium Aldo-Keto Reductase.

Scoble, J.Mcalister, A.D.Fulton, Z.Troy, S.Byres, E.Vivian, J.P.Brammananth, R.Wilce, M.C.J.Le Nours, J.Zaker-Tabrizi, L.Coppel, R.L.Crellin, P.K.Rossjohn, J.Beddoe, T.

(2010) J Mol Biol 398: 26

  • DOI: https://doi.org/10.1016/j.jmb.2010.02.021
  • Primary Citation of Related Structures:  
    2WZM, 2WZT

  • PubMed Abstract: 

    Aldo-keto reductases (AKRs) are a large superfamily of NADPH-dependent enzymes that catalyze the reduction of aldehydes, aldoses, dicarbonyls, steroids, and monosaccharides. While their precise physiological role is generally unknown, AKRs are nevertheless involved in the detoxification of a broad range of toxic metabolites. Mycobacteria contain a number of AKRs, the majority of which are uncharacterised. Here, we report the 1.9 and 1.6 A resolution structures of the apoenzyme and NADPH-bound forms, respectively, of an AKR (MSMEG_2407) from Mycobacterium smegmatis, a close homologue of the M. tuberculosis enzyme Rv2971, whose function is essential to this bacterium. MSMEG_2407 adopted the triosephosphate isomerase (alpha/beta)(8)-barrel fold exhibited by other AKRs. MSMEG_2407 (AKR5H1) bound NADPH via an induced-fit mechanism, in which the NADPH was ligated in an extended fashion. Polar-mediated interactions dominated the interactions with the cofactor, which is atypical of the mode of NADPH binding within the AKR family. Moreover, the nicotinamide ring of NADPH was disordered, and this was attributed to the lack of an "AKR-conserved" bulky residue within the nicotinamide-binding cavity of MSMEG_2407. Enzymatic characterisation of MSMEG_2407 and Rv2971 identified dicarbonyls as a preferred substrate family for hydrolysis, and the frontline antituberculosis drug isoniazid (INH) was shown to inhibit the enzyme activity of both recombinant MSMEG_2407 and Rv2971. However, differences between the affinities of MSMEG_2407 and Rv2971 for dicarbonyls and INH were observed, and this was attributable to amino acid substitutions within the cofactor- and substrate-binding sites. The structures of MSMEG_2407 and the accompanying biochemical characterisation of MSMEG_2407 and Rv2971 provide insight into the structure and function of AKRs from mycobacteria.

  • Organizational Affiliation

    Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
283Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Find proteins for A0QV09 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QV09 
Go to UniProtKB:  A0QV09
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0QV09
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NA7

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C15 H24 N5 O16 P3
Binding Affinity Annotations 
IDSourceBinding Affinity
NA7 PDBBind:  2WZM Ki: 6000 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.64 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.456α = 90
b = 65.456β = 90
c = 96.844γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other