5O8Q

Crystal structure of R. ruber ADH-A, mutant Y294F, W295A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

Starting Model: experimental
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Literature

Relaxation of nonproductive binding and increased rate of coenzyme release in an alcohol dehydrogenase increases turnover with a nonpreferred alcohol enantiomer.

Hamnevik, E.Enugala, T.R.Maurer, D.Ntuku, S.Oliveira, A.Dobritzsch, D.Widersten, M.

(2017) FEBS J 284: 3895-3914

  • DOI: https://doi.org/10.1111/febs.14279
  • Primary Citation of Related Structures:  
    5O8H, 5O8Q, 5O9D, 5O9F

  • PubMed Abstract: 

    Alcohol dehydrogenase A (ADH-A) from Rhodococcus ruber DSM 44541 is a promising biocatalyst for redox transformations of arylsubstituted sec-alcohols and ketones. The enzyme is stereoselective in the oxidation of 1-phenylethanol with a 300-fold preference for the (S)-enantiomer. The low catalytic efficiency with (R)-1-phenylethanol has been attributed to nonproductive binding of this substrate at the active site. Aiming to modify the enantioselectivity, to rather favor the (R)-alcohol, and also test the possible involvement of nonproductive substrate binding as a mechanism in substrate discrimination, we performed directed laboratory evolution of ADH-A. Three targeted sites that contribute to the active-site cavity were exposed to saturation mutagenesis in a stepwise manner and the generated variants were selected for improved catalytic activity with (R)-1-phenylethanol. After three subsequent rounds of mutagenesis, selection and structure-function analysis of isolated ADH-A variants, we conclude: (a) W295 has a key role as a structural determinant in the discrimination between (R)- and (S)-1-phenylethanol and a W295A substitution fundamentally changes the stereoselectivity of the protein. One observable effect is a faster rate of NADH release, which changes the rate-limiting step of the catalytic cycle from coenzyme release to hydride transfer. (b) The obtained change in enantiopreference, from the (S)- to the (R)-alcohol, can be partly explained by a shift in the nonproductive substrate-binding modes. Structural data are available in the Protein Data Bank with accession codes 5o8q for A2, 5o8h for A2C2, 5o9f for A2C3, and 5o9d for A2C2B1.


  • Organizational Affiliation

    Department of Chemistry - BMC, Uppsala University, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alcohol dehydrogenase
A, B, C, D, E
A, B, C, D, E, F, G, H
352Rhodococcus sp. M8Mutation(s): 2 
Gene Names: BKE56_025765
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download Ideal Coordinates CCD File 
CA [auth G]
FA [auth H]
K [auth A]
N [auth B]
Q [auth C]
CA [auth G],
FA [auth H],
K [auth A],
N [auth B],
Q [auth C],
T [auth D],
W [auth E],
Z [auth F]
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
AA [auth G]
BA [auth G]
DA [auth H]
EA [auth H]
I [auth A]
AA [auth G],
BA [auth G],
DA [auth H],
EA [auth H],
I [auth A],
J [auth A],
L [auth B],
M [auth B],
O [auth C],
P [auth C],
R [auth D],
S [auth D],
U [auth E],
V [auth E],
X [auth F],
Y [auth F]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.689α = 90
b = 109.458β = 90
c = 256.653γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
xia2data reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-11
    Type: Initial release
  • Version 1.1: 2017-11-29
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description