The C296A mutant of L-sorbosone dehydrogenase (SNDH) from Gluconobacter Oxydans WSH-004

Experimental Data Snapshot

  • Resolution: 2.22 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 

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Structural Insight into the Catalytic Mechanisms of an L-Sorbosone Dehydrogenase.

Li, D.Deng, Z.Hou, X.Qin, Z.Wang, X.Yin, D.Chen, Y.Rao, Y.Chen, J.Zhou, J.

(2023) Adv Sci (Weinh) 10: e2301955-e2301955

  • DOI: https://doi.org/10.1002/advs.202301955
  • Primary Citation of Related Structures:  
    7W5K, 7W5L, 7W5N

  • PubMed Abstract: 

    L-Sorbosone dehydrogenase (SNDH) is a key enzyme involved in the biosynthesis of 2-keto-L-gulonic acid , which is a direct precursor for the industrial scale production of vitamin C. Elucidating the structure and the catalytic mechanism is essential for improving SNDH performance. By solving the crystal structures of SNDH from Gluconobacter oxydans WSH-004, a reversible disulfide bond between Cys295 and the catalytic Cys296 residues is discovered. It allowed SNDH to switch between oxidation and reduction states, resulting in opening or closing the substrate pocket. Moreover, the Cys296 is found to affect the NADP + binding pose with SNDH. Combining the in vitro biochemical and site-directed mutagenesis studies, the redox-based dynamic regulation and the catalytic mechanisms of SNDH are proposed. Moreover, the mutants with enhanced activity are obtained by extending substrate channels. This study not only elucidates the physiological control mechanism of the dehydrogenase, but also provides a theoretical basis for engineering similar enzymes.

  • Organizational Affiliation

    Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu, 214122, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
L-sorbosone dehydrogenase, NAD(P) dependent
A, B, C, D
504Gluconobacter oxydansMutation(s): 0 
Find proteins for Q47943 (Gluconobacter oxydans)
Explore Q47943 
Go to UniProtKB:  Q47943
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47943
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.22 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.305α = 90
b = 117.928β = 95.14
c = 108.179γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
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 China (NSFC)China31830068

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-01
    Type: Initial release
  • Version 1.1: 2023-12-27
    Changes: Data collection, Database references, Refinement description