Identification of the active site nucleophile in the thermostable β- glycosidase from the archaeon Sulfolobus solfataricus expressed in Escherichia coli

F. Febbraio, R. Barone, S. D'Auria, M. Rossi, R. Nucci, G. Piccialli, L. De Napoli, S. Orrù, P. Pucci

Research output: Contribution to journalArticle

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Abstract

Sulfolobus solfataricus β-glycosidase expressed in Escherichia coli was fully inactivated at 65 °C, according to pseudo-first-order kinetics, by [3H]conduritol B epoxide (DL-1,2 anhydro-myo-inositol) synthesized as the active site directed inhibitor by a slight modification of Legler's procedure [Legler, G. (1977) Methods Enzymol. 46, 368-381]. The determination of kinetic constants for the inactivation showed that the process took place through the formation of a stabilized inhibitor-enzyme intermediate. Inactivation and reactivation studies suggested that the inhibitor-enzyme intermediate complex was formed more rapidly and hydrolyzed at a lower rate than it was for other glycosidases. Moreover, the stoichiometry of the binding, determined by electrospray mass spectrometric analysis, revealed that one molecule of the inhibitor was covalently bound to each enzyme subunit. The binding site for [3H]conduritol B epoxide was identified by the isolation and partial sequence analysis of the radioactive peptide obtained by cyanogen bromide and pepsin digests. Electrospray tandem mass analysis of the labeled peptide showed that the inhibitor was covalently bound to E387. This result, in agreement with data obtained from sequence alignments of S. solfataricus β-glycosidase with other gluco- and galactosidases of the glycosyl hydrolase family 1 [Henrissat, B. (1991) Biochem. J. 280, 309-316], indicates that the conserved E387 is the nucleophilic amino acid residue in the active site of the enzyme.

Original languageEnglish
Pages (from-to)3068-3075
Number of pages8
JournalBiochemistry
Volume36
Issue number11
DOIs
Publication statusPublished - Mar 18 1997

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Sulfolobus solfataricus
Nucleophiles
Glycoside Hydrolases
Archaea
Escherichia coli
Catalytic Domain
Enzyme Inhibitors
Galactosidases
Cyanogen Bromide
Peptides
Kinetics
Sequence Alignment
Pepsin A
Protein Sequence Analysis
Hydrolases
Enzymes
Stoichiometry
Binding Sites
Amino Acids
Molecules

ASJC Scopus subject areas

  • Biochemistry

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Identification of the active site nucleophile in the thermostable β- glycosidase from the archaeon Sulfolobus solfataricus expressed in Escherichia coli. / Febbraio, F.; Barone, R.; D'Auria, S.; Rossi, M.; Nucci, R.; Piccialli, G.; De Napoli, L.; Orrù, S.; Pucci, P.

In: Biochemistry, Vol. 36, No. 11, 18.03.1997, p. 3068-3075.

Research output: Contribution to journalArticle

Febbraio, F. ; Barone, R. ; D'Auria, S. ; Rossi, M. ; Nucci, R. ; Piccialli, G. ; De Napoli, L. ; Orrù, S. ; Pucci, P. / Identification of the active site nucleophile in the thermostable β- glycosidase from the archaeon Sulfolobus solfataricus expressed in Escherichia coli. In: Biochemistry. 1997 ; Vol. 36, No. 11. pp. 3068-3075.
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AU - Barone, R.

AU - D'Auria, S.

AU - Rossi, M.

AU - Nucci, R.

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AU - De Napoli, L.

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AU - Pucci, P.

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