1NAA

Cellobiose Dehydrogenase Flavoprotein Fragment in Complex with Cellobionolactam


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mechanism of the reductive half-reaction in cellobiose dehydrogenase

Hallberg, B.M.Henriksson, G.Pettersson, G.Vasella, A.Divne, C.

(2003) J.BIOL.CHEM. 278: 7160-7166

  • DOI: 10.1074/jbc.M210961200

  • PubMed Abstract: 
  • The extracellular flavocytochrome cellobiose dehydrogenase (CDH; EC ) participates in lignocellulose degradation by white-rot fungi with a proposed role in the early events of wood degradation. The complete hemoflavoenzyme consists of a catalytically ...

    The extracellular flavocytochrome cellobiose dehydrogenase (CDH; EC ) participates in lignocellulose degradation by white-rot fungi with a proposed role in the early events of wood degradation. The complete hemoflavoenzyme consists of a catalytically active dehydrogenase fragment (DH(cdh)) connected to a b-type cytochrome domain via a linker peptide. In the reductive half-reaction, DH(cdh) catalyzes the oxidation of cellobiose to yield cellobiono-1,5-lactone. The active site of DH(cdh) is structurally similar to that of glucose oxidase and cholesterol oxidase, with a conserved histidine residue positioned at the re face of the flavin ring close to the N5 atom. The mechanisms of oxidation in glucose oxidase and cholesterol oxidase are still poorly understood, partly because of lack of experimental structure data or difficulties in interpreting existing data for enzyme-ligand complexes. Here we report the crystal structure of the Phanerochaete chrysosporium DH(cdh) with a bound inhibitor, cellobiono-1,5-lactam, at 1.8-A resolution. The distance between the lactam C1 and the flavin N5 is only 2.9 A, implying that in an approximately planar transition state, the maximum distance for the axial 1-hydrogen to travel for covalent addition to N5 is 0.8-0.9 A. The lactam O1 interacts intimately with the side chains of His-689 and Asn-732. Our data lend substantial structural support to a reaction mechanism where His-689 acts as a general base by abstracting the O1 hydroxyl proton in concert with transfer of the C1 hydrogen as hydride to the re face of the flavin N5.


    Related Citations: 
    • Crystal structure of the flavoprotein domain of the extracellular flavocytochrome cellobiose dehydrogenase
      Hallberg, B.M.,Henriksson, G.,Pettersson, G.,Divne, C.
      (2002) J.Mol.Biol. 315: 421


    Organizational Affiliation

    Department of Biotechnology, Albanova University Center, KTH, SE-106 91 Stockholm, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cellobiose dehydrogenase
A, B
541Phanerochaete chrysosporiumGene Names: CDH-1, CDH-2
EC: 1.1.99.18
Find proteins for Q01738 (Phanerochaete chrysosporium)
Go to UniProtKB:  Q01738
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
6FA
Query on 6FA

Download SDF File 
Download CCD File 
A, B
6-HYDROXY-FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O16 P2
BJSUUWFQAMLNKU-OKXKTURISA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
ABL
Query on ABL

Download SDF File 
Download CCD File 
A, B
(2R,3R,4R,5R)-4,5-dihydroxy-2-(hydroxymethyl)-6-oxopiperidin-3-yl beta-D-glucopyranoside
5-amino-5-deoxy-cellobiono-1,5-lactam
C12 H21 N O10
WXSNJJDPPISYEF-ZNLUKOTNSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ABLKi: 250000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.146 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 185.952α = 90.00
b = 185.952β = 90.00
c = 81.438γ = 120.00
Software Package:
Software NamePurpose
CNSphasing
SCALAdata scaling
REFMACrefinement
CCP4data scaling
MOSFLMdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2014-11-12
    Type: Structure summary