Native Bacillus subtilis Arabinanase Arb43A

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Tailored Catalysts for Plant Cell-Wall Degradation: Redesigning the Exo/Endo Preference of Cellvibrio Japonicus Arabinanase 43A

Proctor, M.Taylor, E.J.Nurizzo, D.Turkenburg, J.Lloyd, R.Vardakou, M.Davies, G.J.Gilbert, H.J.

(2005) Proc Natl Acad Sci U S A 102: 2697

  • DOI: https://doi.org/10.1073/pnas.0500051102
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Enzymes acting on polymeric substrates are frequently classified as exo or endo, reflecting their preference for, or ignorance of, polymer chain ends. Most biotechnological applications, especially in the field of polysaccharide degradation, require either endo- or exo-acting hydrolases, or they harness the essential synergy between these two modes of action. Here, we have used genomic data in tandem with structure to modify, radically, the chain-end specificity of the Cellvibrio japonicus exo-arabinanase CjArb43A. The structure of Bacillus subtilis endo-arabinanase 43A (BsArb43A) in harness with chain-end recognition kinetics of CjArb43A directed a rational design approach that led to the conversion of the Cellvibrio enzyme from an exo to an endo mode of action. One of the exo-acting mutants, D35L/Q316A, displays similar activity to WT CjArb43A and the removal of the steric block mediated by the side chains of Gln-316 and Asp-53 at the -3 subsite confers its capacity to attack internal glycoside bonds. This study provides a template for the production of tailored industrial catalysts. The introduction of subtle changes informed by comparative 3D structural and genomic data can lead to fundamental changes in the mode of action of these enzymes.

  • Organizational Affiliation

    Institute for Cell and Molecular Biosciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE2 4HH, United Kindgom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ARABINAN-ENDO 1,5-ALPHA-L-ARABINASE293Bacillus subtilisMutation(s): 0 
Find proteins for P94522 (Bacillus subtilis (strain 168))
Explore P94522 
Go to UniProtKB:  P94522
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP94522
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.628α = 90
b = 46.153β = 98.96
c = 57.322γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description