Topography and recognition imaging of protein-patterned surfaces generated by afm nanolithography

Rong Zhu, Andreas Ebner, Markus Kastner, Johannes Preiner, Stefan Howorka, Peter Hinterdorfer

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The atomic force microscope (AFM) is a precise, versatile, and powerful tool to pattern biomolecular surfaces and image single molecules. For patterning, the AFM cantilever is used as stylus to scratch nanometer-sized features in soft protein layers via the native-protein nanolithography (NPNL) approach.[ 1, 2] Imaging of individual molecules, on the other hand, exploits the topographic height changes with the cantilever. Detection can also rely on the molecular recognition between surface-bound molecules and complementary receptors tethered to the AFM tip.[3] Recently, both characterization modes have been merged to achieve simultaneous topographic and recognition (TREC) imaging.[4–6] Herein, we combine NPNL and TREC to synergistically use AFM tips to write and image nanoscale protein patterns on a surface. The approach is validated using surface-bound biotinylated bovine serum albumin (BSA) protein and AFM tips carrying streptavidin tethered via a flexible poly(ethylene glycol) (PEG) linker. A detailed biophysical investigation of a key TREC parameter is conducted to optimize the accuracy of the read-out.
Original languageEnglish
Pages (from-to)1478-1481
Number of pages4
JournalChemPhysChem
Volume10
Issue number9-10
DOIs
Publication statusPublished - 13 Jul 2009

Keywords

  • Atomic force microscopy
  • Biotin-streptavidin
  • Molecular recognition
  • Nanolithography
  • Nanostructures
  • Nanostructures/chemistry
  • Biotinylation
  • Streptavidin/chemistry
  • Animals
  • Cattle
  • Surface Properties
  • Microscopy, Atomic Force
  • Serum Albumin, Bovine/chemistry

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