crystal structure of N-acetyltransferase DgcN-25328

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

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Novel D-glutamate catabolic pathway in marine Proteobacteria and halophilic archaea.

Yu, Y.Wang, P.Cao, H.Y.Teng, Z.J.Zhu, Y.Wang, M.McMinn, A.Chen, Y.Xiang, H.Zhang, Y.Z.Chen, X.L.Zhang, Y.Q.

(2023) ISME J 17: 537-548

  • DOI: https://doi.org/10.1038/s41396-023-01364-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    D-glutamate (D-Glu) is an essential component of bacterial peptidoglycans, representing an important, yet overlooked, pool of organic matter in global oceans. However, little is known on D-Glu catabolism by marine microorganisms. Here, a novel catabolic pathway for D-Glu was identified using the marine bacterium Pseudoalteromonas sp. CF6-2 as the model. Two novel enzymes (DgcN, DgcA), together with a transcriptional regulator DgcR, are crucial for D-Glu catabolism in strain CF6-2. Genetic and biochemical data confirm that DgcN is a N-acetyltransferase which catalyzes the formation of N-acetyl-D-Glu from D-Glu. DgcA is a racemase that converts N-acetyl-D-Glu to N-acetyl-L-Glu, which is further hydrolyzed to L-Glu. DgcR positively regulates the transcription of dgcN and dgcA. Structural and biochemical analyses suggested that DgcN and its homologs, which use D-Glu as the acyl receptor, represent a new group of the general control non-repressible 5 (GCN5)-related N-acetyltransferases (GNAT) superfamily. DgcA and DgcN occur widely in marine bacteria (particularly Rhodobacterales) and halophilic archaea (Halobacteria) and are abundant in marine and hypersaline metagenome datasets. Thus, this study reveals a novel D-Glu catabolic pathway in ecologically important marine bacteria and halophilic archaea and helps better understand the catabolism and recycling of D-Glu in these ecosystems.

  • Organizational Affiliation

    Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative NAD-dependent epimerase/dehydratase family protein341Tritonibacter scottomollicaeMutation(s): 0 
Gene Names: CLV89_10851
Find proteins for A0A2T1AE85 (Tritonibacter scottomollicae)
Explore A0A2T1AE85 
Go to UniProtKB:  A0A2T1AE85
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2T1AE85
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.49α = 90
b = 130.8β = 90
c = 131.48γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)ChinaU1706207

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-01
    Type: Initial release
  • Version 1.1: 2023-02-08
    Changes: Database references
  • Version 1.2: 2023-04-05
    Changes: Database references
  • Version 1.3: 2023-11-29
    Changes: Data collection, Refinement description