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Imaging biomolecule arrays by atomic force microscopy

L T Mazzola1, S P Fodor

  • 1Affymetrix, Santa Clara, California 95051, USA.

Biophysical Journal
|May 1, 1995
PubMed
Summary
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This study presents a novel method for creating ordered molecular arrays and detecting biomolecule binding using atomic force microscopy (AFM). The technique enables precise spatial control of ligand presentation for enhanced biomolecule discrimination.

Area of Science:

  • Biotechnology
  • Nanotechnology
  • Surface Science

Background:

  • Discriminating surface-bound biomolecules is challenging due to limitations in controlling ligand presentation.
  • Existing methods lack the spatial precision required for detailed molecular analysis.

Purpose of the Study:

  • To develop a method for constructing ordered molecular arrays.
  • To detect biomolecule binding to these arrays using atomic force microscopy (AFM).
  • To simplify the discrimination of surface-bound biomolecules through spatial control of ligand presentation.

Main Methods:

  • Utilized photolithography to direct the spatial synthesis of biological ligand matrices.
  • Applied high-affinity binding partners to the ligand matrix for specific binding.

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  • Employed atomic force microscopy (AFM) for detecting the presence and organization of bound biomolecules.

    • Main Results:

    • Successfully fabricated streptavidin-biotin arrays with 100x100 micron and 8x8 micron elements.
    • AFM imaging revealed dense streptavidin binding localized to biotin derivatization regions.
    • Characterized protein regions with specific height profiles and granular topography, identifying underlying biotin layers.

    Conclusions:

    • The described method effectively constructs ordered molecular arrays with high spatial precision.
    • AFM is a suitable technique for detecting and characterizing biomolecule binding within these arrays.
    • This approach offers a simplified and precise method for biomolecule discrimination on surfaces.