Adhesion mode atomic force microscopy study of dual component protein films

Aashiish Agnihotri, Christopher Siedlecki

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Molecular recognition imaging by AFM was extended to dual component protein films adsorbed on mica. AFM probes were functionalized by covalently linking polyclonal antibodies against fibrinogen. Adhesion mapping mode of AFM was used to generate both topographic images and adhesion images. The efficacy of the functionalized probes was first established by performing adhesion mapping on patterned dual component protein films formed by microcontact printing bovine serum albumin on a mica surface and then backfilling with fibrinogen. Next, adhesion mapping was done on randomly distributed two-component protein monolayers generated by sequential adsorption of submonolayer amounts of fibrinogen followed by backfilling with bovine serum albumin. The adhesion maps were used to generate binary recognition images where the specific and non-specific interactions were differentiated based on a statistically derived cut-off value. The surface coverage of fibrinogen obtained from the recognition image over the complete dual protein monolayer was similar to that obtained prior to backfilling with bovine serum albumin. The number of recognition events that were observed decreased by >80% after blocking the surface with anti-fibrinogen antibodies. This result demonstrated that the positive events in the recognition image were indeed specific antibody-fibrinogen interactions.

Original languageEnglish (US)
Pages (from-to)257-268
Number of pages12
JournalUltramicroscopy
Volume102
Issue number4
DOIs
StatePublished - Mar 1 2005

Fingerprint

fibrinogen
Fibrinogen
Atomic force microscopy
adhesion
Adhesion
Image recognition
atomic force microscopy
proteins
Proteins
Antibodies
Bovine Serum Albumin
antibodies
albumins
serums
Mica
Monolayers
mica
Molecular recognition
probes
Printing

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

Cite this

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abstract = "Molecular recognition imaging by AFM was extended to dual component protein films adsorbed on mica. AFM probes were functionalized by covalently linking polyclonal antibodies against fibrinogen. Adhesion mapping mode of AFM was used to generate both topographic images and adhesion images. The efficacy of the functionalized probes was first established by performing adhesion mapping on patterned dual component protein films formed by microcontact printing bovine serum albumin on a mica surface and then backfilling with fibrinogen. Next, adhesion mapping was done on randomly distributed two-component protein monolayers generated by sequential adsorption of submonolayer amounts of fibrinogen followed by backfilling with bovine serum albumin. The adhesion maps were used to generate binary recognition images where the specific and non-specific interactions were differentiated based on a statistically derived cut-off value. The surface coverage of fibrinogen obtained from the recognition image over the complete dual protein monolayer was similar to that obtained prior to backfilling with bovine serum albumin. The number of recognition events that were observed decreased by >80{\%} after blocking the surface with anti-fibrinogen antibodies. This result demonstrated that the positive events in the recognition image were indeed specific antibody-fibrinogen interactions.",
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Adhesion mode atomic force microscopy study of dual component protein films. / Agnihotri, Aashiish; Siedlecki, Christopher.

In: Ultramicroscopy, Vol. 102, No. 4, 01.03.2005, p. 257-268.

Research output: Contribution to journalArticle

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