1E4I

2-deoxy-2-fluoro-beta-D-glucosyl/enzyme intermediate complex of the beta-glucosidase from Bacillus polymyxa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis of Increased Resistance to Thermal Denaturation Induced by Single Amino Acid Substitution in the Sequence of Beta-Glucosidase a from Bacillus Polymyxa.

Sanz-Aparicio, J.Hermoso, J.A.Martinez-Ripoll, M.Gonzalez, B.Lopez-Camacho, C.Polaina, J.

(1998) Proteins 33: 567

  • Also Cited By: 1E4I

  • PubMed Abstract: 
  • The increasing development of the biotechnology industry demands the design of enzymes suitable to be used in conditions that often require broad resistance against adverse conditions. beta-glucosidase A from Bacillus polymyxa is an interesting model ...

    The increasing development of the biotechnology industry demands the design of enzymes suitable to be used in conditions that often require broad resistance against adverse conditions. beta-glucosidase A from Bacillus polymyxa is an interesting model for studies of protein engineering. This is a well-characterized enzyme, belonging to glycosyl hydrolase family 1. Its natural substrate is cellobiose, but is also active against various artificial substrates. In its native state has an octameric structure. Its subunit conserves the general (alpha/beta)8 barrel topology of its family, with the active site being in a cavity defined along the axis of the barrel. Using random-mutagenesis, we have identified several mutations enhancing its stability and it was found that one them, the E96K substitution, involved structural changes. The crystal structure of this mutant has been determined by X-ray diffraction and compared with the native structure. The only difference founded between both structures is a new ion pair linking Lys96 introduced at the N-terminus of helix alpha2, to Asp28, located in one of the loops surrounding the active-site cavity. The new ion pair binds two segments of the chain that are distant in sequence and, therefore, this favorable interaction must exert a determinant influence in stabilizing the tertiary structure. Furthermore, analysis of the crystallographic isotropic temperature factors reveals that, as a direct consequence of the introduced ion pair, an unexpected decreased mobility of secondary structure units of the barrel which are proximal to the site of mutation is observed. However, this effect is observed only in the surrounding of one of the partners forming the salt bridge and not around the other. These results show that far-reaching effects can be achieved by a single amino acid replacement within the protein structure. Consequently, the identification and combination of a few single substitutions affecting stability may be sufficient to obtain a highly resistant enzyme, suitable to be used under extreme conditions.


    Related Citations: 
    • Crystal Structure of Beta-Glucosidase a from Bacillus Polymyxa: Insights Into the Catalytic Activity in Family 1 Glycosyl Hydrolases
      Sanz-Aparicio, J.,Hermoso, J.A.,Martinez-Ripoll, M.,Lequerica, J.L.,Polaina, J.
      (1998) J.Mol.Biol. 275: 491
    • Structural Basis of Increased Resistance to Thermal Denaturation Induced by Single Amino Acid Substitution in the Sequence of Beta-Glucosidase a from Bacillus Polymyxa
      Sanz-Aparicio, J.,Hermoso, J.A.,Martinez-Ripoll, M.,Gonzalez, B.,Lopez-Camacho, C.,Polaina, J.
      (1998) Proteins: Struct.,Funct., Genet. 33: 567


    Organizational Affiliation

    Grupo de Cristalografía Macromolecular y Biología Estructural, Instituto de Química-Física Rocasolano, CSIC, Madrid, Spain. xjulia@roca.csic.es




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-GLUCOSIDASE
A
447Paenibacillus polymyxaGene Names: bglA
EC: 3.2.1.21
Find proteins for P22073 (Paenibacillus polymyxa)
Go to UniProtKB:  P22073
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NFG
Query on NFG

Download SDF File 
Download CCD File 
A
2,4-DINITROPHENYL 2-DEOXY-2-FLUORO-BETA-D-GLUCOPYRANOSIDE
C12 H13 F N2 O9
UFSBFVZQJZMIOU-LZQZFOIKSA-N
 Ligand Interaction
G2F
Query on G2F

Download SDF File 
Download CCD File 
A
2-deoxy-2-fluoro-alpha-D-glucopyranose
C6 H11 F O5
ZCXUVYAZINUVJD-UKFBFLRUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.210 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 136.230α = 90.00
b = 136.230β = 90.00
c = 173.260γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
X-PLORrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-07-05
    Type: Initial release
  • Version 1.1: 2014-07-30
    Type: Database references, Structure summary, Version format compliance