1UP7

Structure of the 6-phospho-beta glucosidase from Thermotoga maritima at 2.4 Angstrom resolution in the tetragonal form with NAD and glucose-6-phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Nad+ and Metal-Ion Dependent Hydrolysis by Family 4 Glycosidases: Structural Insight Into Specificity for Phospho-Beta-D-Glucosides

Varrot, A.Yip, V.L.Li, Y.Rajan, S.S.Yang, X.Anderson, W.F.Thompson, J.Withers, S.G.Davies, G.J.

(2005) J Mol Biol 346: 423

  • DOI: 10.1016/j.jmb.2004.11.058
  • Primary Citation of Related Structures:  
    1UP7, 1UP4

  • PubMed Abstract: 
  • The import of disaccharides by many bacteria is achieved through their simultaneous translocation and phosphorylation by the phosphoenolpyruvate-dependent phosphotransferase system (PEP-PTS). The imported phospho-disaccharides are, in some cases, subsequently hydrolyzed by members of the unusual glycoside hydrolase family GH4 ...

    The import of disaccharides by many bacteria is achieved through their simultaneous translocation and phosphorylation by the phosphoenolpyruvate-dependent phosphotransferase system (PEP-PTS). The imported phospho-disaccharides are, in some cases, subsequently hydrolyzed by members of the unusual glycoside hydrolase family GH4. The GH4 enzymes, occasionally found also in bacteria such as Thermotoga maritima that do not utilise a PEP-PTS system, require both NAD(+) and Mn(2+) for catalysis. A further curiosity of this family is that closely related enzymes may show specificity for either alpha-d- or beta-d-glycosides. Here, we present, for the first time, the three-dimensional structure (using single-wavelength anomalous dispersion methods, harnessing extensive non-crystallographic symmetry) of the 6-phospho-beta-glycosidase, BglT, from T.maritima in native and complexed (NAD(+) and Glc6P) forms. Comparison of the active-center structure with that of the 6-phospho-alpha-glucosidase GlvA from Bacillus subtilis reveals a striking degree of structural similarity that, in light of previous kinetic isotope effect data, allows the postulation of a common reaction mechanism for both alpha and beta-glycosidases. Given that the "chemistry" occurs primarily on the glycone sugar and features no nucleophilic attack on the intact disaccharide substrate, modulation of anomeric specificity for alpha and beta-linkages is accommodated through comparatively minor structural changes.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, University of York, York, YO10 5YW, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
6-PHOSPHO-BETA-GLUCOSIDASE ABCDEFGH417Thermotoga maritima MSB8Mutation(s): 0 
Gene Names: bglTTM_1281
EC: 3.2.1.6 (PDB Primary Data), 3.2.1.86 (UniProt)
Find proteins for Q9X108 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Explore Q9X108 
Go to UniProtKB:  Q9X108
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 178.132α = 90
b = 178.132β = 90
c = 278.927γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2012-06-20
    Changes: Other
  • Version 1.3: 2016-12-28
    Changes: Data collection, Structure summary
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Other, Structure summary