8E75

Crystal structure of Pcryo_0616, the aminotransferase required to synthesize UDP-N-acetyl-3-amino-D-glucosaminuronic acid (UDP-GlcNAc3NA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Investigation of the enzymes required for the biosynthesis of 2,3-diacetamido-2,3-dideoxy-d-glucuronic acid in Psychrobacter cryohalolentis K5 T.

Hofmeister, D.L.Seltzner, C.A.Bockhaus, N.J.Thoden, J.B.Holden, H.M.

(2023) Protein Sci 32: e4502-e4502

  • DOI: https://doi.org/10.1002/pro.4502
  • Primary Citation of Related Structures:  
    8E62, 8E75, 8E77

  • PubMed Abstract: 

    Psychrobacter cryohalolentis K5 T is a Gram-negative bacterium first isolated from Siberian permafrost in 2006. It has a complex O-antigen containing l-rhamnose, d-galactose, two diacetamido-sugars, and one triacetamido-sugar. The biosynthetic pathway for one of the diacetamido-sugars, namely 2,3-diacetamido-2,3-dideoxy-d-glucuronic acid, is presently unknown. Utilizing the published genome sequence of P. cryohalolentis K5 T , we hypothesized that the genes designated Pcryo_0613, Pcryo_0614, Pcryo_0616, and Pcryo_0615 encode for a uridine dinucleotide (UDP)-N-acetyl-d-glucosamine 6-dehydrogenase, an nicotinamide adenine dinucleotide (oxidized) (NAD + )-dependent dehydrogenase, a pyridoxal 5'-phosphate (PLP)-dependent aminotransferase, and an N-acetyltransferase, respectively, activities of which would be required for the biosynthesis of this unusual carbohydrate. Here we present the cloning, overexpression, and purification of these hypothetical proteins. Kinetic data on the enzymes encoded by Pcryo_0613, Pcryo_0614, and Pcryo_0615 confirmed their postulated biochemical activities. In addition, the high-resolution X-ray structures of both the internal and external aldimine forms of the aminotransferase were determined to 1.25 and 1.0 Å, respectively. Finally, the three-dimensional architecture of the N-acetyltransferase in complex with its substrate and coenzyme A was solved to 1.8 Å resolution. Strikingly, the N-acetyltransferase was shown to adopt a new motif for UDP-sugar binding. The data presented herein provide additional insight into sugar biosynthesis in Gram-negative bacteria.


  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DegT/DnrJ/EryC1/StrS aminotransferase380Psychrobacter cryohalolentis K5Mutation(s): 0 
Gene Names: Pcryo_0616
UniProt
Find proteins for Q1QD54 (Psychrobacter cryohalolentis (strain ATCC BAA-1226 / DSM 17306 / VKM B-2378 / K5))
Explore Q1QD54 
Go to UniProtKB:  Q1QD54
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1QD54
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.828α = 90
b = 96.344β = 90
c = 139.658γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
SAINTdata reduction
SADABSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35 GM134643

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-23
    Type: Initial release
  • Version 1.1: 2023-01-11
    Changes: Database references
  • Version 1.2: 2023-10-25
    Changes: Data collection, Refinement description
  • Version 1.3: 2023-11-15
    Changes: Data collection