Structure of 3,6-anhydro-L-galactose Dehydrogenase in Complex with NAP

Experimental Data Snapshot

  • Resolution: 2.37 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.163 

Starting Model: experimental
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3,6-Anhydro-L-Galactose Dehydrogenase VvAHGD is a Member of a New Aldehyde Dehydrogenase Family and Catalyzes by a Novel Mechanism with Conformational Switch of Two Catalytic Residues Cysteine 282 and Glutamate 248.

Wang, Y.Li, P.Y.Zhang, Y.Cao, H.Y.Wang, Y.J.Li, C.Y.Wang, P.Su, H.N.Chen, Y.Chen, X.L.Zhang, Y.Z.

(2020) J Mol Biol 432: 2186-2203

  • DOI: https://doi.org/10.1016/j.jmb.2020.02.008
  • Primary Citation of Related Structures:  
    6J75, 6J76

  • PubMed Abstract: 

    3,6-anhydro-α-L-galactose (L-AHG) is one of the main monosaccharide constituents of red macroalgae. In the recently discovered bacterial L-AHG catabolic pathway, L-AHG is first oxidized by a NAD(P) + -dependent dehydrogenase (AHGD), which is a key step of this pathway. However, the catalytic mechanism(s) of AHGDs is still unclear. Here, we identified and characterized an AHGD from marine bacterium Vibrio variabilis JCM 19239 (VvAHGD). The NADP + -dependent VvAHGD could efficiently oxidize L-AHG. Phylogenetic analysis suggested that VvAHGD and its homologs represent a new aldehyde dehydrogenase (ALDH) family with different substrate preferences from reported ALDH families, named the L-AHGDH family. To explain the catalytic mechanism of VvAHGD, we solved the structures of VvAHGD in the apo form and complex with NADP + and modeled its structure with L-AHG. Based on structural, mutational, and biochemical analyses, the cofactor channel and the substrate channel of VvAHGD are identified, and the key residues involved in the binding of NADP + and L-AHG and the catalysis are revealed. VvAHGD performs catalysis by controlling the consecutive connection and interruption of the cofactor channel and the substrate channel via the conformational changes of its two catalytic residues Cys282 and Glu248. Comparative analyses of structures and enzyme kinetics revealed that differences in the substrate channels (in shape, size, electrostatic surface, and residue composition) lead to the different substrate preferences of VvAHGD from other ALDHs. This study on VvAHGD sheds light on the diversified catalytic mechanisms and evolution of NAD(P) + -dependent ALDHs.

  • Organizational Affiliation

    State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, 266237, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aldehyde dehydrogenase A
A, B
488Vibrio variabilisMutation(s): 0 
Gene Names: JCM19239_2055
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C21 H28 N7 O17 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.37 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.163 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.378α = 90
b = 90.737β = 90
c = 149.052γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina41676180
National Natural Science Foundation of ChinaChina91751101

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-22
    Type: Initial release
  • Version 1.1: 2020-08-05
    Changes: Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description