5OA5

CELLOBIOHYDROLASE I (CEL7A) FROM HYPOCREA JECORINA WITH IMPROVED THERMAL STABILITY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Improving the thermal stability of cellobiohydrolase Cel7A from Hypocrea jecorina by directed evolution.

Goedegebuur, F.Dankmeyer, L.Gualfetti, P.Karkehabadi, S.Hansson, H.Jana, S.Huynh, V.Kelemen, B.R.Kruithof, P.Larenas, E.A.Teunissen, P.J.M.Stahlberg, J.Payne, C.M.Mitchinson, C.Sandgren, M.

(2017) J. Biol. Chem. 292: 17418-17430

  • DOI: 10.1074/jbc.M117.803270

  • PubMed Abstract: 
  • Secreted mixtures of <i>Hypocrea jecorina </i> cellulases are able to efficiently degrade cellulosic biomass to fermentable sugars at large, commercially relevant scales. <i>H. jecorina </i> Cel7A, cellobiohydrolase I, from glycoside hydrolase fami ...

    Secreted mixtures of Hypocrea jecorina cellulases are able to efficiently degrade cellulosic biomass to fermentable sugars at large, commercially relevant scales. H. jecorina Cel7A, cellobiohydrolase I, from glycoside hydrolase family 7, is the workhorse enzyme of the process. However, the thermal stability of Cel7A limits its use to processes where temperatures are no higher than 50 °C. Enhanced thermal stability is desirable to enable the use of higher processing temperatures and to improve the economic feasibility of industrial biomass conversion. Here, we enhanced the thermal stability of Cel7A through directed evolution. Sites with increased thermal stability properties were combined, and a Cel7A variant (FCA398) was obtained, which exhibited a 10.4 °C increase in T m and a 44-fold greater half-life compared with the wild-type enzyme. This Cel7A variant contains 18 mutated sites and is active under application conditions up to at least 75 °C. The X-ray crystal structure of the catalytic domain was determined at 2.1 Å resolution and showed that the effects of the mutations are local and do not introduce major backbone conformational changes. Molecular dynamics simulations revealed that the catalytic domain of wild-type Cel7A and the FCA398 variant exhibit similar behavior at 300 K, whereas at elevated temperature (475 and 525 K), the FCA398 variant fluctuates less and maintains more native contacts over time. Combining the structural and dynamic investigations, rationales were developed for the stabilizing effect at many of the mutated sites.


    Organizational Affiliation

    the Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506.,DuPont Industrial Biosciences, Palo Alto, California 94304.,the Department of Molecular Sciences, Swedish University of Agricultural Sciences, PO Box 7015, Uppsala SE-75007, Sweden, and mats.sandgren@slu.se.,the Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506 christy.payne@uky.edu.,From DuPont Industrial Biosciences, Archimedesweg 30, Leiden 2333CN, The Netherlands.,the Department of Molecular Sciences, Swedish University of Agricultural Sciences, PO Box 7015, Uppsala SE-75007, Sweden, and.,From DuPont Industrial Biosciences, Archimedesweg 30, Leiden 2333CN, The Netherlands, frits.goedegebuur@dupont.com.,the Department of Molecular Sciences, Swedish University of Agricultural Sciences, PO Box 7015, Uppsala SE-75007, Sweden, and jerry.stahlberg@slu.se.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Exoglucanase 1
A, B
434Hypocrea jecorinaMutation(s): 17 
Gene Names: cbh1
EC: 3.2.1.91
Find proteins for P62694 (Hypocrea jecorina)
Go to UniProtKB:  P62694
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A, B
L-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 102.940α = 90.00
b = 92.100β = 90.00
c = 102.200γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
SCALAdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science FoundationUnited States1552355
NSFUnited StatesACI-1053575 (under allocation MCB090159)

Revision History 

  • Version 1.0: 2017-09-06
    Type: Initial release
  • Version 1.1: 2017-09-13
    Type: Database references
  • Version 1.2: 2017-11-01
    Type: Database references