Thermobaculum terrenum O-GlcNAc transferase mutant - K341M

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.219 

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Evidence for a Functional O-Linked N-Acetylglucosamine (O-GlcNAc) System in the Thermophilic Bacterium Thermobaculum terrenum.

Ostrowski, A.Gundogdu, M.Ferenbach, A.T.Lebedev, A.A.van Aalten, D.M.

(2015) J Biol Chem 290: 30291-30305

  • DOI: https://doi.org/10.1074/jbc.M115.689596
  • Primary Citation of Related Structures:  
    5DIY, 5DJS

  • PubMed Abstract: 

    Post-translational modification of proteins is a ubiquitous mechanism of signal transduction in all kingdoms of life. One such modification is addition of O-linked N-acetylglucosamine to serine or threonine residues, known as O-GlcNAcylation. This unusual type of glycosylation is thought to be restricted to nucleocytoplasmic proteins of eukaryotes and is mediated by a pair of O-GlcNAc-transferase and O-GlcNAc hydrolase enzymes operating on a large number of substrate proteins. Protein O-GlcNAcylation is responsive to glucose and flux through the hexosamine biosynthetic pathway. Thus, a close relationship is thought to exist between the level of O-GlcNAc proteins within and the general metabolic state of the cell. Although isolated apparent orthologues of these enzymes are present in bacterial genomes, their biological functions remain largely unexplored. It is possible that understanding the function of these proteins will allow development of reductionist models to uncover the principles of O-GlcNAc signaling. Here, we identify orthologues of both O-GlcNAc cycling enzymes in the genome of the thermophilic eubacterium Thermobaculum terrenum. The O-GlcNAcase and O-GlcNAc-transferase are co-expressed and, like their mammalian orthologues, localize to the cytoplasm. The O-GlcNAcase orthologue possesses activity against O-GlcNAc proteins and model substrates. We describe crystal structures of both enzymes, including an O-GlcNAcase·peptide complex, showing conservation of active sites with the human orthologues. Although in vitro activity of the O-GlcNAc-transferase could not be detected, treatment of T. terrenum with an O-GlcNAc-transferase inhibitor led to inhibition of growth. T. terrenum may be the first example of a bacterium possessing a functional O-GlcNAc system.

  • Organizational Affiliation

    Science Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0FA, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tetratricopeptide TPR_2 repeat protein
A, B, C, D
529Thermobaculum terrenumMutation(s): 1 
Gene Names: Tter_2822
Find proteins for D1CIY5 (Thermobaculum terrenum (strain ATCC BAA-798 / YNP1))
Explore D1CIY5 
Go to UniProtKB:  D1CIY5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD1CIY5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.188α = 90
b = 216.361β = 90
c = 216.406γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
SCALEPACKdata scaling
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited KingdomWT087590MA

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-28
    Type: Initial release
  • Version 1.1: 2015-11-04
    Changes: Database references
  • Version 1.2: 2015-12-30
    Changes: Database references
  • Version 1.3: 2017-08-30
    Changes: Author supporting evidence