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Applied Microbiology and Biotechnology

, Volume 95, Issue 5, pp 1221–1233 | Cite as

In search of sustainable chemical processes: cloning, recombinant expression, and functional characterization of the 7α- and 7β-hydroxysteroid dehydrogenases from Clostridium absonum

  • Erica Elisa Ferrandi
  • Giulia Maria Bertolesi
  • Fausto Polentini
  • Armando Negri
  • Sergio Riva
  • Daniela MontiEmail author
Biotechnologically relevant enzymes and proteins

Abstract

Nicotinamide adenine dinucleotide phosphate-dependent 7α-hydroxysteroid dehydrogenase (7α-HSDH) and 7β-hydroxysteroid dehydrogenases (7β-HSDH) from Clostridium absonum catalyze the epimerization of primary bile acids through 7-keto bile acid intermediates and may be suitable as biocatalysts for the synthesis of bile acids derivatives of pharmacological interest. C. absonum 7α-HSDH has been purified to homogeneity and the N-terminal sequence has been determined by Edman sequencing. After PCR amplifications of a gene fragment with degenerate primers, cloning of the complete gene (786 nt) has been achieved by sequencing of C. absonum genomic DNA. The sequence coding for the 7β-HSDH (783 nt) has been obtained by sequencing of the genomic DNA region flanking the 5′ termini of 7α-HSDH gene, the two genes being contiguous and presumably part of the same operon. After insertion in suitable expression vectors, both HSDHs have been successfully produced in recombinant form in Escherichia coli, purified by affinity chromatography and submitted to kinetic analysis for determination of Michaelis constants (K m) and specificity constants (k cat/K m) in the presence of various bile acids derivatives. Both enzymes showed a very strong substrate inhibition with all the tested substrates. The lowest K S values were observed with chenodeoxycholic acid and 12-ketochenodeoxycholic acid as substrates in the case of 7α-HSDH, whereas ursocholic acid was the most effective inhibitor of 7β-HSDH activity.

Keywords

Hydroxysteroid dehydrogenases Clostridium absonum Bile acids Cloning Biochemical characterization Substrate inhibition 

Notes

Acknowledgments

We thank Dr. Elena Fossati (Concordia University, Montreal), Dr. Matteo Piazza (University of Milano-Bicocca), and Dr. Chiara Dugoni (University of Modena & Reggio Emilia) for valuable contribution to protein purification and characterization. Prodotti Chimici Alimentari S.p.A. is gratefully acknowledged for financial support to EEF.

Supplementary material

253_2011_3798_MOESM1_ESM.doc (2.1 mb)
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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Erica Elisa Ferrandi
    • 1
  • Giulia Maria Bertolesi
    • 1
  • Fausto Polentini
    • 2
  • Armando Negri
    • 3
  • Sergio Riva
    • 1
  • Daniela Monti
    • 1
    Email author
  1. 1.Istituto di Chimica del Riconoscimento Molecolare, C.N.R.MilanItaly
  2. 2.Prodotti Chimici e Alimentari S. p. A.BasaluzzoItaly
  3. 3.Dipartimento di Patologia Animale Igiene e Sanità Pubblica VeterinariaUniversità degli Studi di MilanoMilanItaly

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