Cryo-EM structure of NADH bound SLA dehydrogenase RlGabD from Rhizobium leguminosarum bv. trifolii SRD1565

Experimental Data Snapshot

  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Molecular basis of sulfolactate synthesis by sulfolactaldehyde dehydrogenase from Rhizobium leguminosarum.

Li, J.Sharma, M.Meek, R.Alhifthi, A.Armstrong, Z.Soler, N.M.Lee, M.Goddard-Borger, E.D.Blaza, J.N.Davies, G.J.Williams, S.J.

(2023) Chem Sci 14: 11429-11440

  • DOI: https://doi.org/10.1039/d3sc01594g
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Sulfolactate (SL) is a short-chain organosulfonate that is an important reservoir of sulfur in the biosphere. SL is produced by oxidation of sulfolactaldehyde (SLA), which in turn derives from sulfoglycolysis of the sulfosugar sulfoquinovose, or through oxidation of 2,3-dihydroxypropanesulfonate. Oxidation of SLA is catalyzed by SLA dehydrogenases belonging to the aldehyde dehydrogenase superfamily. We report that SLA dehydrogenase Rl GabD from the sulfoglycolytic bacterium Rhizobium leguminsarum SRDI565 can use both NAD + and NADP + as cofactor to oxidize SLA, and indicatively operates through a rapid equilibrium ordered mechanism. We report the cryo-EM structure of Rl GabD bound to NADH, revealing a tetrameric quaternary structure and supporting proposal of organosulfonate binding residues in the active site, and a catalytic mechanism. Sequence based homology searches identified SLA dehydrogenase homologs in a range of putative sulfoglycolytic gene clusters in bacteria predominantly from the phyla Actinobacteria, Firmicutes, and Proteobacteria. This work provides a structural and biochemical view of SLA dehydrogenases to complement our knowledge of SLA reductases, and provide detailed insights into a critical step in the organosulfur cycle.

  • Organizational Affiliation

    School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne Parkville Victoria 3010 Australia sjwill@unimelb.edu.au.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Succinate semialdehyde dehydrogenase
A, B, C, D
497Rhizobium leguminosarum bv. trifolii SRDI565Mutation(s): 0 
Gene Names: EV132_10158
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Royal SocietyUnited KingdomRP/EA/180016
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/W003805/1
National Health and Medical Research Council (NHMRC, Australia)AustraliaGNT2000517
The Walter and Eliza Hall Institute of Medical ResearchAustralia--
The Australian Cancer Research FundAustralia--
The Brian M. Davis Charitable Foundation Centenary FellowshipAustralia--

Revision History  (Full details and data files)

  • Version 1.0: 2023-09-20
    Type: Initial release
  • Version 1.1: 2024-04-10
    Changes: Database references