2L8A

Structure of a novel CBM3 lacking the calcium-binding site


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Dissecting structure-function-stability relationships of a thermostable GH5-CBM3 cellulase from Bacillus subtilis 168.

Santos, C.R.Paiva, J.H.Sforca, M.L.Neves, J.L.Navarro, R.Z.Cota, J.Akao, P.K.Hoffmam, Z.B.Meza, A.N.Smetana, J.H.Nogueira, M.L.Polikarpov, I.Xavier-Neto, J.Squina, F.M.Ward, R.J.Ruller, R.Zeri, A.C.Murakami, M.T.

(2012) Biochem J 441: 95-104

  • DOI: 10.1042/BJ20110869
  • Primary Citation of Related Structures:  
    3PZU, 3PZV, 3PZT, 2L8A

  • PubMed Abstract: 
  • Cellulases participate in a number of biological events, such as plant cell wall remodelling, nematode parasitism and microbial carbon uptake. Their ability to depolymerize crystalline cellulose is of great biotechnological interest for environmentally compatible production of fuels from lignocellulosic biomass ...

    Cellulases participate in a number of biological events, such as plant cell wall remodelling, nematode parasitism and microbial carbon uptake. Their ability to depolymerize crystalline cellulose is of great biotechnological interest for environmentally compatible production of fuels from lignocellulosic biomass. However, industrial use of cellulases is somewhat limited by both their low catalytic efficiency and stability. In the present study, we conducted a detailed functional and structural characterization of the thermostable BsCel5A (Bacillus subtilis cellulase 5A), which consists of a GH5 (glycoside hydrolase 5) catalytic domain fused to a CBM3 (family 3 carbohydrate-binding module). NMR structural analysis revealed that the Bacillus CBM3 represents a new subfamily, which lacks the classical calcium-binding motif, and variations in NMR frequencies in the presence of cellopentaose showed the importance of polar residues in the carbohydrate interaction. Together with the catalytic domain, the CBM3 forms a large planar surface for cellulose recognition, which conducts the substrate in a proper conformation to the active site and increases enzymatic efficiency. Notably, the manganese ion was demonstrated to have a hyper-stabilizing effect on BsCel5A, and by using deletion constructs and X-ray crystallography we determined that this effect maps to a negatively charged motif located at the opposite face of the catalytic site.


    Organizational Affiliation

    Laboratório Nacional de Biociências, Centro Nacional de Pesquisa em Energia e Materiais, Campinas SP, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EndoglucanaseA149Bacillus subtilisMutation(s): 0 
Gene Names: eglSbglCgldBSU18130
EC: 3.2.1.4
Find proteins for P10475 (Bacillus subtilis (strain 168))
Explore P10475 
Go to UniProtKB:  P10475
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 2L8A Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-21
    Type: Initial release
  • Version 1.1: 2011-12-28
    Changes: Database references