5GLY

Crystal structure of a glycoside hydrolase in complex with cellotetrose from Thielavia terrestris NRRL 8126


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


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Literature

Characterization and crystal structure of a thermostable glycoside hydrolase family 45 1,4-beta-endoglucanase from Thielavia terrestris

Gao, J.Huang, J.W.Li, Q.Liu, W.D.Ko, T.P.Zheng, Y.Y.Xiao, X.Kuo, C.J.Chen, C.C.Guo, R.T.

(2017) Enzyme Microb. Technol. 99: 32-37

  • DOI: 10.1016/j.enzmictec.2017.01.005
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 1,4-β-Endoglucanase is one of the most important biocatalysts in modern industries. Here, a glycoside hydrolase (GH) family 45 endoglucanase from thermophilic fungus Theilavia terrestris (TtCel45A) was expressed in Pichia pastoris. The recombinant pr ...

    1,4-β-Endoglucanase is one of the most important biocatalysts in modern industries. Here, a glycoside hydrolase (GH) family 45 endoglucanase from thermophilic fungus Theilavia terrestris (TtCel45A) was expressed in Pichia pastoris. The recombinant protein shows optimal activity at 60°C, pH 4-5. The enzyme exhibits extraordinary thermostability that more than 80% activity was detected after heating at 80°C for 2.5h. The high resolution crystal structures of apo-form enzyme and that in complex with cellobiose and cellotetraose were solved to 1.36-1.58Å. The protein folds into two overall regions: one is a six-stranded β-barrel, and the other one consists of several extended loops. Between the two regions lies the substrate-binding channel, which is an open cleft spanning across the protein surface. A continuous substrate-binding cleft from subsite -4 to +3 were clearly identified in the complex structures. Notably, the flexible V-VI loop (113Gly-114Gly-115Asp-116Leu-117Gly-118Ser) is found to open in the presence of -1 sugar, with D115 and L116 swung away to yield a space to accommodate the catalytic acid D122 and the 2,5B boat conformation of -1 sugar during transition state. Collectively, we characterized the enzyme properties of P. pastoris-expressed TtCel45A and solved high-resolution crystal structures of the enzyme. These results are of great interests in industrial applications and provide new insights into the fundamental understanding of enzyme catalytic mechanism of GH45 endoglucanases.


    Organizational Affiliation

    Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycoside hydrolase family 45 protein
A
213Thielavia terrestris (strain ATCC 38088 / NRRL 8126)Mutation(s): 0 
Find proteins for G2QVH7 (Thielavia terrestris (strain ATCC 38088 / NRRL 8126))
Go to UniProtKB:  G2QVH7
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CTT
Query on CTT

Download SDF File 
Download CCD File 
A
beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranose
CELLOTETRAOSE
C24 H42 O21
LUEWUZLMQUOBSB-HGDSAIHNSA-N
 Ligand Interaction
CTR
Query on CTR

Download SDF File 
Download CCD File 
A
CELLOTRIOSE
Dextrin
C18 H32 O16
FYGDTMLNYKFZSV-RZDZXANRSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.342α = 90.00
b = 54.793β = 90.00
c = 84.839γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-04-19
    Type: Initial release