6Y1B

X-ray structure of Lactobacillus brevis alcohol dehydrogenase mutant K32A_Q126K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.136 
  • R-Value Work: 0.105 
  • R-Value Observed: 0.107 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal Contact Engineering Enables Efficient Capture and Purification of an Oxidoreductase by Technical Crystallization.

Grob, P.Huber, M.Walla, B.Hermann, J.Janowski, R.Niessing, D.Hekmat, D.Weuster-Botz, D.

(2020) Biotechnol J 15: e2000010-e2000010

  • DOI: https://doi.org/10.1002/biot.202000010
  • Primary Citation of Related Structures:  
    6Y0S, 6Y15, 6Y1B

  • PubMed Abstract: 

    Technical crystallization is an attractive method to purify recombinant proteins. However, it is rarely applied due to the limited crystallizability of many proteins. To overcome this limitation, single amino acid exchanges are rationally introduced to enhance intermolecular interactions at the crystal contacts of the industrially relevant biocatalyst Lactobacillus brevis alcohol dehydrogenase (LbADH). The wildtype (WT) and the best crystallizing and enzymatically active LbADH mutants K32A, D54F, Q126H, and T102E are produced with Escherichia coli and subsequently crystallized from cell lysate in stirred mL-crystallizers. Notwithstanding the high host cell protein (HCP) concentrations in the lysate, all mutants crystallize significantly faster than the WT. Combinations of mutations result in double mutants with faster crystallization kinetics than the respective single mutants, demonstrating a synergetic effect. The almost entire depletion of the soluble LbADH fraction at crystallization equilibrium is observed, proving high yields. The HCP concentration is reduced to below 0.5% after crystal dissolution and recrystallization, and thus a 100-fold HCP reduction is achieved after two successive crystallization steps. The combination of fast kinetics, high yields, and high target protein purity highlights the potential of crystal contact engineering to transform technical crystallization into an efficient protein capture and purification step in biotechnological downstream processes.


  • Organizational Affiliation

    Technische Universität München, Lehrstuhl für Bioverfahrenstechnik, Boltzmannstraße 15, Garching, 85748, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
R-specific alcohol dehydrogenase
A, B
262Levilactobacillus brevisMutation(s): 2 
Gene Names: radh
UniProt
Find proteins for Q84EX5 (Levilactobacillus brevis)
Explore Q84EX5 
Go to UniProtKB:  Q84EX5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ84EX5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.136 
  • R-Value Work: 0.105 
  • R-Value Observed: 0.107 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.28α = 90
b = 82.03β = 90
c = 114.59γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyWE2715/14-1

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-19
    Type: Initial release
  • Version 1.1: 2020-08-12
    Changes: Database references, Derived calculations
  • Version 1.2: 2020-12-16
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Database references, Refinement description