6B7K

GH43 Endo-Arabinanase from Bacillus licheniformis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

GH43 endo-arabinanase from Bacillus licheniformis: Structure, activity and unexpected synergistic effect on cellulose enzymatic hydrolysis.

Farro, E.G.S.Leite, A.E.T.Silva, I.A.Filgueiras, J.G.de Azevedo, E.R.Polikarpov, I.Nascimento, A.S.

(2018) Int. J. Biol. Macromol. 117: 7-16

  • DOI: 10.1016/j.ijbiomac.2018.05.157

  • PubMed Abstract: 
  • The hydrolysis of the plant biomass provides many interesting opportunities for the generation of building blocks for the green chemistry industrial applications. An important progress has been made for the hydrolysis of the cellulosic component of t ...

    The hydrolysis of the plant biomass provides many interesting opportunities for the generation of building blocks for the green chemistry industrial applications. An important progress has been made for the hydrolysis of the cellulosic component of the biomass while, for the hemicellulosic components, the advances are less straightforward. Here, we describe the cloning, expression and biochemical and structural characterization of BlAbn1, a GH43 arabinanase from Bacillus licheniformis. This enzyme is selective for linear arabinan and efficiently hydrolyzes this substrate, with a specific activity of 127 U/mg. The enzyme has optimal conditions for activity at pH 8.0 and 45 °C and its activity is only partially dependent of a bound calcium ion since 70% of the maximal activity is preserved even when 1 mM EDTA is added to the reaction medium. BlAbn1 crystal structure revealed a typical GH43 fold and narrow active site, which explains the selectivity for linear substrates. Unexpectedly, the enzyme showed a synergic effect with the commercial cocktail Accellerase 1500 on cellulose hydrolysis. Scanning Electron Microscopy, Solid-State NMR and relaxometry data indicate that the enzyme weakens the interaction between cellulose fibers in filter paper, thus providing an increased access to the cellulases of the cocktail.


    Organizational Affiliation

    Instituto de Física de São Carlos, Universidade de São Paulo. Av. Trabalhador São Carlense, 400. Pq Arnold Schimidt., Sao Carlos, SP 13566-590, Brazil. Electronic address: asnascimento@ifsc.usp.br.,Instituto de Física de São Carlos, Universidade de São Paulo. Av. Trabalhador São Carlense, 400. Pq Arnold Schimidt., Sao Carlos, SP 13566-590, Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Endo-alpha-(1->5)-L-arabinanase
A, B, C, D
301Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / NBRC 12200 / NCIMB 9375 / NRRL NRS-1264 / Gibson 46)Mutation(s): 0 
Gene Names: abnA
EC: 3.2.1.99
Find proteins for Q65GB9 (Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / NBRC 12200 / NCIMB 9375 / NRRL NRS-1264 / Gibson 46))
Go to UniProtKB:  Q65GB9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, C, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 64.558α = 90.00
b = 124.178β = 91.16
c = 69.231γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Sao Paulo Research FoundationBrazil2014/03768-0
Sao Paulo Research FoundationBrazil2014/06565-2

Revision History 

  • Version 1.0: 2018-06-13
    Type: Initial release
  • Version 1.1: 2019-04-17
    Type: Author supporting evidence, Data collection