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Applied Microbiology and Biotechnology

, Volume 91, Issue 4, pp 1061–1072 | Cite as

The crystal structure of an esterase from the hyperthermophilic microorganism Pyrobaculum calidifontis VA1 explains its enantioselectivity

  • Gottfried J. Palm
  • Elena Fernández-Álvaro
  • Xenia Bogdanović
  • Sebastian Bartsch
  • Jaroslaw Sczodrok
  • Rajesh K. Singh
  • Dominique Böttcher
  • Haruyuki Atomi
  • Uwe T. BornscheuerEmail author
  • Winfried HinrichsEmail author
Biotechnologically Relevant Enzymes and Proteins

Abstract

The highly thermostable esterase from the hyperthermophilic archaeon Pyrobaculum calidifontis VA1 (PestE) shows high enantioselectivity (E > 100) in the kinetic resolution of racemic chiral carboxylic acids, but little selectivity towards acetates of tertiary alcohols (E = 2–4). To explain these unique properties, its crystal structure has been determined at 2.0 Å resolution. The enzyme is a member of the hormone-sensitive lipase group (group H) of the esterase/lipase superfamily on the basis of the amino acid sequence identity. The PestE structure shows a canonical α/β-hydrolase fold as core domain with a cap structure at the C-terminal end of the β-sheet. A tetramer in the crystal packing is formed of two dimers; the dimeric form is observed in solution. Conserved dimers and even tetramers are found in other group H proteins. The amino acid residues Ser157, His284, and Asp254 form the catalytic triad, which is typically found in α/β-hydrolases. The oxyanion hole is composed of Gly85 and Gly86 within the conserved sequence motif HGGG(M,F,W) (amino acid residues 83–87) and Ala158. With the elucidated structure, experimental results about enantioselectivity towards the two model substrate classes (as exemplified for 3-phenylbutanoic acid ethyl ester and 1,1,1-trifluoro-2-phenylbut-3-yn-2-yl acetate) could be explained by molecular modeling. For both enantiomers of the tertiary alcohol, orientations in two binding pockets were obtained without significant energy differences corresponding to the observed low enantioselectivity due to missing steric repulsions. In contrast, for the carboxylic acid ester, two different orientations with significant energy differences for each enantiomer were found matching the high E values.

Keywords

Hyperthermophilic esterase α/β-Hydrolase fold Crystal structure Enantioselectivity 

Notes

Acknowledgments

We are grateful to the Deutsche Bundesstiftung Umwelt (Osnabrück, Germany) for financial support (grant no. AZ13198) and thank Britta Girbardt (Institute of Biochemistry, Greifswald) for her support in crystallization.

Supplementary material

253_2011_3337_MOESM1_ESM.doc (78 kb)
ESM 1 (DOC 78 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Gottfried J. Palm
    • 1
  • Elena Fernández-Álvaro
    • 2
  • Xenia Bogdanović
    • 1
  • Sebastian Bartsch
    • 2
  • Jaroslaw Sczodrok
    • 2
  • Rajesh K. Singh
    • 1
  • Dominique Böttcher
    • 2
  • Haruyuki Atomi
    • 3
  • Uwe T. Bornscheuer
    • 2
    Email author
  • Winfried Hinrichs
    • 1
    Email author
  1. 1.Department of Molecular Structural Biology, Institute of BiochemistryGreifswald UniversityGreifswaldGermany
  2. 2.Department of Biotechnology and Enzyme Catalysis, Institute of BiochemistryGreifswald UniversityGreifswaldGermany
  3. 3.Department of Synthetic Chemistry and Biological Chemistry, Graduate School of EngineeringKyoto UniversityKyotoJapan

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