2JKA

Native structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.157 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Divergence of Catalytic Mechanism within a Glycosidase Family Provides Insight Into Evolution of Carbohydrate Metabolism by Human Gut Flora.

Gloster, T.M., Turkenburg, J.P., Potts, J.R., Henrissat, B., Davies, G.J.

(2008) Chem Biol 15: 1058

  • DOI: 10.1016/j.chembiol.2008.09.005
  • Primary Citation of Related Structures:  
    2JKA, 2JKE, 2JKP

  • PubMed Abstract: 

    • Enzymatic cleavage of the glycosidic bond yields products in which the anomeric configuration is either retained or inverted. Each mechanism reflects the dispositions of the enzyme functional groups; a facet of which is essentially conserved in 113 glycoside hydrolase (GH) families ...

    Enzymatic cleavage of the glycosidic bond yields products in which the anomeric configuration is either retained or inverted. Each mechanism reflects the dispositions of the enzyme functional groups; a facet of which is essentially conserved in 113 glycoside hydrolase (GH) families. We show that family GH97 has diverged significantly, as it contains both inverting and retaining alpha-glycosidases. This reflects evolution of the active center; a glutamate acts as a general base in inverting members, exemplified by Bacteroides thetaiotaomicron alpha-glucosidase BtGH97a, whereas an aspartate likely acts as a nucleophile in retaining members. The structure of BtGH97a and its complexes with inhibitors, coupled to kinetic analysis of active-site variants, reveals an unusual calcium ion dependence. 1H NMR analysis shows an inversion mechanism for BtGH97a, whereas another GH97 enzyme from B. thetaiotaomicron, BtGH97b, functions as a retaining alpha-galactosidase.

    Organizational Affiliation: 

    York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5YW, UK. gloster@ysbl.york.ac.uk



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-GLUCOSIDASE (ALPHA-GLUCOSIDASE SUSB)A, B727Bacteroides thetaiotaomicron VPI-5482Mutation(s): 0 
Gene Names: susB, BT_3703
EC: 3.2.1.20 (PDB Primary Data), 3.2.1.3 (UniProt)
UniProt
Find proteins for G8JZS4 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50))
Explore G8JZS4 
Go to UniProtKB:  G8JZS4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG8JZS4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.157 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.629α = 90
b = 111.554β = 100.85
c = 102.442γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
RESOLVEphasing
REFMACrefinement

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-30
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance