Enzyme solid-state support assays: a surface plasmon resonance and mass spectrometry coupled study of immobilized insulin degrading enzyme

  • Giuseppe GrassoEmail author
  • Ashley I. Bush
  • Roberta D’Agata
  • Enrico Rizzarelli
  • Giuseppe Spoto
Original Paper


Solid-support based assays offer several advantages that are not normally available in solution. Enzymes that are anchored on gold surfaces can interact with several different molecules, opening the way to high throughput array format based assays. In this scenario, surface plasmon resonance (SPR) and mass spectrometry (MS) investigations have often been applied to analyze the interaction between immobilized enzyme and its substrate molecules in a tag-free environment. Here, we propose a SPR-MS combined experimental approach aimed at studying insulin degrading enzyme (IDE) immobilized onto gold surfaces and its ability to interact with insulin. The latter is delivered by a microfluidic system to the IDE functionalized surface and the activity of the immobilized enzyme is verified by atmospheric pressure/matrix assisted laser desorption ionization (AP/MALDI) MS analysis. The SPR experiments allow the calculation of the kinetic constants involved for the interaction between immobilized IDE and insulin molecules and evidence of IDE conformational change upon insulin binding is also obtained.


Solid-state assay Surface plasmon resonance Mass spectrometry Insulin degrading enzyme Conformational change 



We thank MIUR (FIRB RBNE03PX83, RBIN04L28Y) and “EURAMY: Systemic Amyloidoses in Europe”, 037525 (LSHM-CT-2006-037525) for partial financial support.


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Copyright information

© European Biophysical Societies' Association 2008

Authors and Affiliations

  • Giuseppe Grasso
    • 1
    Email author
  • Ashley I. Bush
    • 2
    • 3
  • Roberta D’Agata
    • 1
  • Enrico Rizzarelli
    • 1
  • Giuseppe Spoto
    • 1
    • 4
  1. 1.Dipartimento Scienze ChimicheUniversità di CataniaCataniaItaly
  2. 2.Department of PsychiatryMassachusetts General HospitalCharlestoneUSA
  3. 3.Department of Pathology, Mental Health Research Institute of VictoriaThe University of MelbourneParkvilleAustralia
  4. 4.Istituto di Biostrutture e Bioimmagini, CNRCataniaItaly

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