Two-dimensional 1H and 1H-detected NMR study of a heterogeneous biocatalyst using fast MAS at high magnetic fields

Sabu Varghese, Peter J. Halling, Daniel Häussinger, Stephen Wimperis

Research output: Contribution to journalArticle

5 Citations (Scopus)
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Abstract

Nuclear magnetic resonance (NMR) is a powerful tool for investigating atomic-scale structure in heterogeneous or composite materials where long-range order is absent. In this work solid-state 1H and 1H-detected NMR experiments were performed with fast magic angle spinning (νR = 75 kHz) and at high magnetic fields (B0 = 20 T) and used to gain structural insight into a heterogeneous biocatalyst consisting of an enzyme, human carbonic anhydrase II (hCA II), covalently immobilized on epoxy-functionalized silica. Two-dimensional 1H-1H NOESY-type correlation experiments were able to provide information on 1H environments in silica, epoxy-silica and the immobilized enzyme. Two distinct signals originating from water protons were observed: water associated with the surface of the silica and the water associated with the immobilized enzyme. Additional two-dimensional 1H-1H double–single quantum (DQ-SQ) correlation experiments suggested that the immobilized enzyme is not in close contact with the silica surface. Most significantly, comparison of two-dimensional 1H-15N spectra of the immobilized enzyme and the solution-state enzyme confirmed that the structural integrity of the protein is well preserved upon covalent immobilization.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalSolid State Nuclear Magnetic Resonance
Volume92
Early online date14 Mar 2018
DOIs
Publication statusE-pub ahead of print - 14 Mar 2018

Keywords

  • solid-state NMR
  • biocatalysis
  • covalent immobilization
  • epoxy-functionalized silica
  • hCA II
  • heterogeneous biocatalysts
  • human carbonic anhydrase II
  • immobilized enzymes

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