1OCQ

COMPLEX OF THE ENDOGLUCANASE CEL5A FROM BACILLUS AGARADHEARANS AT 1.08 ANGSTROM RESOLUTION with cellobio-derived isofagomine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.08 Å
  • R-Value Free: 0.127 
  • R-Value Work: 0.115 
  • R-Value Observed: 0.115 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Direct Observation of the Protonation State of an Imino Sugar Glycosidase Inhibitor Upon Binding

Varrot, A.Tarling, C.A.Macdonald, J.M.Stick, R.V.Zechel, D.L.Withers, S.G.Davies, G.J.

(2003) J Am Chem Soc 125: 7496

  • DOI: 10.1021/ja034917k
  • Primary Citation of Related Structures:  
    1OCQ

  • PubMed Abstract: 
  • Glycosidases are some of the most ubiquitous enzyme in nature. Their biological significance, coupled to their enormous catalytic prowess derived from tight binding of the transition state, is reflected in their importance as therapeutic targets. Many glycosidase inhibitors are known ...

    Glycosidases are some of the most ubiquitous enzyme in nature. Their biological significance, coupled to their enormous catalytic prowess derived from tight binding of the transition state, is reflected in their importance as therapeutic targets. Many glycosidase inhibitors are known. Imino sugars are often potent inhibitors, yet many facets of their mode of action, such as their degree, if any, of transition-state "mimicry" and their protonation state when bound to the target glycosidase remain unclear. Atomic resolution analysis of the endoglucanase, Cel5A, in complex with a cellobio-derived isofagomine in conjunction with the pH dependence of Ki and kcat/KM reveals that this compound binds as a protonated sugar. Surprisingly, both the enzymatic nucleophile and the acid/base are unprotonated in the complex.


    Organizational Affiliation

    Department of Chemistry, Structural Biology Laboratory, The University of York, Heslington, York YO10 5YW, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ENDOGLUCANASE 5A A303Salipaludibacillus agaradhaerensMutation(s): 0 
Gene Names: cel5A
EC: 3.2.1.4
Find proteins for O85465 (Salipaludibacillus agaradhaerens)
Explore O85465 
Go to UniProtKB:  O85465
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download Ideal Coordinates CCD File 
A
beta-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
IFM
Query on IFM

Download Ideal Coordinates CCD File 
A
5-HYDROXYMETHYL-3,4-DIHYDROXYPIPERIDINE
C6 H13 N O3
QPYJXFZUIJOGNX-HSUXUTPPSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.08 Å
  • R-Value Free: 0.127 
  • R-Value Work: 0.115 
  • R-Value Observed: 0.115 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.023α = 90
b = 69.677β = 90
c = 76.899γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-26
    Type: Initial release
  • Version 1.1: 2015-07-22
    Changes: Derived calculations, Non-polymer description, Other, Source and taxonomy, Version format compliance
  • Version 1.2: 2019-03-06
    Changes: Data collection, Derived calculations, Experimental preparation, Other
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary