Biochemistry (Moscow)

, Volume 78, Issue 10, pp 1112–1123 | Cite as

Improvement of the efficiency of transglycosylation catalyzed by α-galactosidase from Thermotoga maritima by protein engineering

  • K. S. Bobrov
  • A. S. Borisova
  • E. V. Eneyskaya
  • D. R. Ivanen
  • K. A. Shabalin
  • A. A. Kulminskaya
  • G. N. Rychkov
Article

Abstract

At high concentrations of p-nitrophenyl-α-D-galactopyranoside (pNPGal) as a substrate, its hydrolysis catalyzed by α-galactosidase from Thermotoga maritima (TmGalA) is accompanied by transglycosylation resulting in production of a mixture of (α1,2)-, (α1,3)-, and (α1,6)-p-nitrophenyl (pNP)-digalactosides. Molecular modeling of the reaction stage preceding the formation of the pNP-digalactosides within the active site of the enzyme revealed amino acid residues which modification was expected to increase the efficiency of transglycosylation. Upon the site-directed mutagenesis to the predicted substitutions of the amino acid residues, genes encoding the wild type TmGalA and its mutants were expressed in E. coli, and the corresponding enzymes were isolated and tested for the presence of the transglycosylating activity in synthesis of different pNP-digalactosides. Three mutants, F328A, P402D, and G385L, were shown to markedly increase the total transglycosylation as compared to the wild type enzyme. Moreover, the F328A mutant displayed an ability to produce a regio-isomer with the (α1,2)-bond at yield 16-times higher than the wild type TmGalA.

Key words

α-D-galactosidase transglycosylation enzymatic synthesis of pNP-digalactosides 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • K. S. Bobrov
    • 1
  • A. S. Borisova
    • 1
  • E. V. Eneyskaya
    • 1
  • D. R. Ivanen
    • 1
  • K. A. Shabalin
    • 1
  • A. A. Kulminskaya
    • 1
  • G. N. Rychkov
    • 1
    • 2
  1. 1.Petersburg Nuclear Physics InstituteGatchina, Leningrad RegionRussia
  2. 2.St. Petersburg State Polytechnical UniversitySt. PetersburgRussia

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