3N04

THE CRYSTAL STRUCTURE OF THE alpha-Glucosidase (FAMILY 31) FROM RUMINOCOCCUS OBEUM ATCC 29174


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

THE CRYSTAL STRUCTURE OF THE alpha-Glucosidase (FAMILY 31) FROM RUMINOCOCCUS OBEUM ATCC 29174

Tan, K.Tesar, C.Wilton, R.Keigher, L.Babnigg, G.Joachimiak, A.

(2010) FASEB J 24: 3939-3949

  • DOI: https://doi.org/10.1096/fj.10-156257
  • Primary Citation of Related Structures:  
    3M46, 3M6D, 3MKK, 3N04

  • PubMed Abstract: 

    The human intestine harbors a large number of microbes forming a complex microbial community that greatly affects the physiology and pathology of the host. In the human gut microbiome, the enrichment in certain protein gene families appears to be widespread. They include enzymes involved in carbohydrate metabolism such as glucoside hydrolases of dietary polysaccharides and glycoconjugates. We report the crystal structures (wild type, 2 mutants, and a mutant/substrate complex) and the enzymatic activity of a recombinant α-glucosidase from human gut bacterium Ruminococcus obeum. The first ever protein structures from this bacterium reveal a structural homologue to human intestinal maltase-glucoamylase with a highly conserved catalytic domain and reduced auxiliary domains. The α-glucosidase, a member of GH31 family, shows substrate preference for α(1-6) over α(1-4) glycosidic linkages and produces glucose from isomaltose as well as maltose. The preference can be switched by a single mutation at its active site, suggestive of widespread adaptation to utilization of a variety of polysaccharides by intestinal micro-organisms as energy resources.


  • Organizational Affiliation

    Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
alpha-glucosidase
A, B
666Blautia obeum ATCC 29174Mutation(s): 0 
Gene Names: RUMOBE_03919
EC: 3.2.1
UniProt
Find proteins for A5ZY13 (Blautia obeum ATCC 29174)
Explore A5ZY13 
Go to UniProtKB:  A5ZY13
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5ZY13
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.861α = 90
b = 124.97β = 107.74
c = 88.601γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
SHELXDphasing
MLPHAREphasing
DMmodel building
ARPmodel building
WARPmodel building
HKL-3000phasing
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling
DMphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance