3CK9

B. thetaiotaomicron SusD with maltoheptaose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Starch catabolism by a prominent human gut symbiont is directed by the recognition of amylose helices.

Koropatkin, N.M.Martens, E.C.Gordon, J.I.Smith, T.J.

(2008) Structure 16: 1105-1115

  • DOI: https://doi.org/10.1016/j.str.2008.03.017
  • Primary Citation of Related Structures:  
    3CK7, 3CK8, 3CK9, 3CKB, 3CKC

  • PubMed Abstract: 

    The human gut microbiota performs functions that are not encoded in our Homo sapiens genome, including the processing of otherwise undigestible dietary polysaccharides. Defining the structures of proteins involved in the import and degradation of specific glycans by saccharolytic bacteria complements genomic analysis of the nutrient-processing capabilities of gut communities. Here, we describe the atomic structure of one such protein, SusD, required for starch binding and utilization by Bacteroides thetaiotaomicron, a prominent adaptive forager of glycans in the distal human gut microbiota. The binding pocket of this unique alpha-helical protein contains an arc of aromatic residues that complements the natural helical structure of starch and imposes this conformation on bound maltoheptaose. Furthermore, SusD binds cyclic oligosaccharides with higher affinity than linear forms. The structures of several SusD/oligosaccharide complexes reveal an inherent ligand recognition plasticity dominated by the three-dimensional conformation of the oligosaccharides rather than specific interactions with the composite sugars.


  • Organizational Affiliation

    Donald Danforth Plant Science Center, St. Louis, MO 63132, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SusD
A, B
527Bacteroides thetaiotaomicronMutation(s): 0 
Gene Names: SusD
UniProt
Find proteins for Q8A1G2 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50))
Explore Q8A1G2 
Go to UniProtKB:  Q8A1G2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8A1G2
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose
C
7N/A
Glycosylation Resources
GlyTouCan:  G41288IQ
GlyCosmos:  G41288IQ
GlyGen:  G41288IQ
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose
D
6N/A
Glycosylation Resources
GlyTouCan:  G91368RN
GlyCosmos:  G91368RN
GlyGen:  G91368RN
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
I [auth A]
J [auth A]
K [auth A]
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
L [auth B],
M [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.61α = 65.06
b = 73.22β = 72.19
c = 83.38γ = 69.73
Software Package:
Software NamePurpose
SAINTdata scaling
AMoREphasing
CNSrefinement
PDB_EXTRACTdata extraction
PROTEUM PLUSdata collection
PROTEUM PLUSdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-05-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 2.1: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary