2WAA

Structure of a family two carbohydrate esterase from Cellvibrio japonicus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Active Site of a Carbohydrate Esterase Displays Divergent Catalytic and Noncatalytic Binding Functions.

Montanier, C.Money, V.A.Pires, V.M.R.Flint, J.E.Pinheiro, B.A.Goyal, A.Prates, J.A.M.Izumi, A.Stalbrand, H.Morland, C.Cartmell, A.Kolenova, K.Topakas, E.Dodson, E.J.Bolam, D.N.Davies, G.J.Fontes, C.M.G.A.Gilbert, H.J.

(2009) PLoS Biol 7: E71

  • DOI: 10.1371/journal.pbio.1000071
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Multifunctional proteins, which play a critical role in many biological processes, have typically evolved through the recruitment of different domains that have the required functional diversity. Thus the different activities displayed by these prote ...

    Multifunctional proteins, which play a critical role in many biological processes, have typically evolved through the recruitment of different domains that have the required functional diversity. Thus the different activities displayed by these proteins are mediated by spatially distinct domains, consistent with the specific chemical requirements of each activity. Indeed, current evolutionary theory argues that the colocalization of diverse activities within an enzyme is likely to be a rare event, because it would compromise the existing activity of the protein. In contrast to this view, a potential example of multifunctional recruitment into a single protein domain is provided by CtCel5C-CE2, which contains an N-terminal module that displays cellulase activity and a C-terminal module, CtCE2, which exhibits a noncatalytic cellulose-binding function but also shares sequence identity with the CE2 family of esterases. Here we show that, unlike other CE2 members, the CtCE2 domain displays divergent catalytic esterase and noncatalytic carbohydrate binding functions. Intriguingly, these diverse activities are housed within the same site on the protein. Thus, a critical component of the active site of CtCE2, the catalytic Ser-His dyad, in harness with inserted aromatic residues, confers noncatalytic binding to cellulose whilst the active site of the domain retains its esterase activity. CtCE2 catalyses deacetylation of noncellulosic plant structural polysaccharides to deprotect these substrates for attack by other enzymes. Yet it also acts as a cellulose-binding domain, which promotes the activity of the appended cellulase on recalcitrant substrates. The CE2 family encapsulates the requirement for multiple activities by biocatalysts that attack challenging macromolecular substrates, including the grafting of a second, powerful and discrete noncatalytic binding functionality into the active site of an enzyme. This article provides a rare example of "gene sharing," where the introduction of a second functionality into the active site of an enzyme does not compromise the original activity of the biocatalyst.


    Organizational Affiliation

    Institute for Cell and Molecular Biosciences, Newcastle University, The Medical School, Newcastle upon Tyne, UK.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
XYLAN ESTERASE, PUTATIVE, AXE2CA347Cellvibrio japonicusMutation(s): 0 
EC: 3.1.1.72 (PDB Primary Data), 3.1.1 (UniProt)
Find proteins for B3PIB0 (Cellvibrio japonicus (strain Ueda107))
Explore B3PIB0 
Go to UniProtKB:  B3PIB0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.157 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.163α = 90
b = 132.163β = 90
c = 45.79γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
SHELXDphasing
SHELXEphasing
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2009-03-24
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance