7B73

Insight into the molecular determinants of thermal stability in halohydrin dehalogenase HheD2.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

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Literature

Insights into the molecular determinants of thermal stability in halohydrin dehalogenase HheD2.

Wessel, J.Petrillo, G.Estevez-Gay, M.Bosch, S.Seeger, M.Dijkman, W.P.Iglesias-Fernandez, J.Hidalgo, A.Uson, I.Osuna, S.Schallmey, A.

(2021) FEBS J 

  • DOI: 10.1111/febs.15777
  • Primary Citation of Related Structures:  
    7B73

  • PubMed Abstract: 
  • Halohydrin dehalogenases (HHDHs) are promising enzymes for application in biocatalysis due to their promiscuous epoxide ring-opening activity with various anionic nucleophiles. So far, seven different HHDH subtypes A to G have been reported with subtype D containing the by far largest number of enzymes ...

    Halohydrin dehalogenases (HHDHs) are promising enzymes for application in biocatalysis due to their promiscuous epoxide ring-opening activity with various anionic nucleophiles. So far, seven different HHDH subtypes A to G have been reported with subtype D containing the by far largest number of enzymes. Moreover, several characterized members of subtype D have been reported to display outstanding characteristics such as high catalytic activity, broad substrate spectra or remarkable thermal stability. Yet, no structure of a D-type HHDH has been reported to date that could be used to investigate and understand those features on a molecular level. We therefore solved the crystal structure of HheD2 from gamma proteobacterium HTCC2207 at 1.6 Å resolution and used it as a starting point for targeted mutagenesis in combination with molecular dynamics (MD) simulation, in order to study the low thermal stability of HheD2 in comparison with other members of subtype D. This revealed a hydrogen bond between conserved residues Q160 and D198 to be connected with a high catalytic activity of this enzyme. Moreover, a flexible surface region containing two α-helices was identified to impact thermal stability of HheD2. Exchange of this surface region by residues of HheD3 yielded a variant with 10 °C higher melting temperature and reaction temperature optimum. Overall, our results provide important insights into the structure-function relationship of HheD2 and presumably for other D-type HHDHs. DATABASES: Structural data are available in PDB database under the accession number 7B73.


    Organizational Affiliation

    Institute for Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Short-chain dehydrogenase/reductase SDR ABCD243gamma proteobacterium HTCC2207Mutation(s): 0 
Gene Names: GB2207_06463
Find proteins for Q1YQT8 (gamma proteobacterium HTCC2207)
Explore Q1YQT8 
Go to UniProtKB:  Q1YQT8
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.022α = 90
b = 94.857β = 90
c = 140.271γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XPREPdata reduction
SCALEPACKdata scaling
Arcimboldophasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of Science, Innovation, and UniversitiesSpainPGC2018-101370-B-100

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-07
    Type: Initial release