Family 37 trehalase from Escherichia coli in complex with casuarine-6- O-alpha-glucopyranose

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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Total Syntheses of Casuarine and its 6-O-Alpha-Glucoside: Complementary Inhibition Towards Glycoside Hydrolases of the Gh31 and Gh37 Families.

Cardona, F.Parmeggiani, C.Faggi, E.Bonaccini, C.Gratteri, P.Sim, L.Gloster, T.M.Roberts, S.Davies, G.J.Rose, D.R.Goti, A.

(2009) Chemistry 15: 1627

  • DOI: https://doi.org/10.1002/chem.200801578
  • Primary Citation of Related Structures:  
    2JJB, 3CTT

  • PubMed Abstract: 

    Total synthesis of naturally occurring casuarine (1) and the first total synthesis of casuarine 6-O-alpha-glucoside (2) were achieved through complete stereoselective nitrone cycloaddition, Tamao-Fleming oxidation and selective alpha-glucosylation as key steps. Biological assays of the two compounds proved their strong and selective inhibitory properties towards glucoamylase NtMGAM and trehalase Tre37A, respectively, which place them among the most powerful inhibitors of these enzymes. The structural determination of the complexes of NtMGAM with 1 and of Tre37A with 2 revealed interesting similarities in the catalytic sites of these two enzymes which belong to different families and clans.

  • Organizational Affiliation

    Department of Organic Chemistry U. Schiff, Laboratory of Design, Synthesis and Study of Biologically Active Heterocycles, University of Florence, Via della Lastruccia, 13, 50019 Sesto Fiorentino (FI), Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
535Escherichia coli K-12Mutation(s): 0 
Find proteins for P13482 (Escherichia coli (strain K12))
Explore P13482 
Go to UniProtKB:  P13482
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13482
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 3CU

Download Ideal Coordinates CCD File 
DA [auth C],
E [auth A],
RA [auth D],
T [auth B]
C8 H15 N O5
Query on GLC

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EA [auth C],
F [auth A],
SA [auth D],
U [auth B]
C6 H12 O6
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth B]
AB [auth D]
BA [auth B]
FA [auth C]
G [auth A]
AA [auth B],
AB [auth D],
BA [auth B],
FA [auth C],
G [auth A],
GA [auth C],
H [auth A],
HA [auth C],
I [auth A],
IA [auth C],
J [auth A],
JA [auth C],
K [auth A],
KA [auth C],
L [auth A],
LA [auth C],
M [auth A],
MA [auth C],
N [auth A],
NA [auth C],
O [auth A],
OA [auth C],
P [auth A],
PA [auth C],
Q [auth A],
R [auth A],
TA [auth D],
UA [auth D],
V [auth B],
VA [auth D],
W [auth B],
WA [auth D],
X [auth B],
XA [auth D],
Y [auth B],
YA [auth D],
Z [auth B],
ZA [auth D]
O4 S
Query on EDO

Download Ideal Coordinates CCD File 
CA [auth B],
QA [auth C],
S [auth A]
C2 H6 O2
Binding Affinity Annotations 
IDSourceBinding Affinity
3CU PDBBind:  2JJB Ki: 12 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.481α = 90
b = 117.863β = 90
c = 203.451γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary