3MMU

Crystal structure of endoglucanase Cel5A from the hyperthermophilic Thermotoga maritima


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.201 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Biochemical characterization and crystal structure of endoglucanase Cel5A from the hyperthermophilic Thermotoga maritima.

Pereira, J.H.Chen, Z.McAndrew, R.P.Sapra, R.Chhabra, S.R.Sale, K.L.Simmons, B.A.Adams, P.D.

(2010) J.Struct.Biol. 172: 372-379

  • DOI: 10.1016/j.jsb.2010.06.018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Tm_Cel5A, which belongs to family 5 of the glycoside hydrolases, is an extremely stable enzyme among the endo-acting glycosidases present in the hyperthermophilic organism Thermotoga maritima. Members of GH5 family shows a common (β/α)(8) TIM-barrel ...

    Tm_Cel5A, which belongs to family 5 of the glycoside hydrolases, is an extremely stable enzyme among the endo-acting glycosidases present in the hyperthermophilic organism Thermotoga maritima. Members of GH5 family shows a common (β/α)(8) TIM-barrel fold in which the catalytic acid/base and nucleophile are located on strands β-4 and β-7 of the barrel fold. Thermally resistant cellulases are desirable for lignocellulosic biofuels production and the Tm_Cel5A is an excellent candidate for use in the degradation of polysaccharides present on biomass. This paper describes two Tm_Cel5A structures (crystal forms I and II) solved at 2.20 and 1.85Å resolution, respectively. Our analyses of the Tm_Cel5A structure and comparison to a mesophilic GH5 provides a basis for the thermostability associated with Tm_Cel5A. Furthermore, both crystal forms of Tm_Cel5A possess a cadmium (Cd(2+)) ion bound between the two catalytic residues. Activity assays of Tm_Cel5A confirmed a strong inhibition effect in the presence of Cd(2+) metal ions demonstrating competition with the natural substrate for the active site. Based on the structural information we have obtained for Tm_Cel5A, protein bioengineering can be used to potentially increase the thermostability of mesophilic cellulase enzymes.


    Organizational Affiliation

    Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Endoglucanase
A, B, C, D, E, F, G, H
317Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Find proteins for Q9X273 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9X273
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NI
Query on NI

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.201 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.205 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 87.584α = 64.08
b = 95.791β = 75.07
c = 103.497γ = 68.73
Software Package:
Software NamePurpose
PHENIXmodel building
HKL-2000data scaling
ADSCdata collection
PHENIXrefinement
PHENIXphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance