Surface differentiation of ferritin and apoferritin with atomic force microscopic techniques

Ru Hung Ho, Yu Hung Chen, Chong Mou Wang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In the study reported herein, we differentiated the structure of ferritin from that of its demetalated counterpart, apoferritin, using field-effect-based atomic force microscopic (AFM) techniques. When ferritin was subjected to conductive-mode AFM analysis, the protein resembled a pancake with a diameter of 10. nm adsorbed on the indium-doped tin-oxide substrate with its fourfold channel perpendicular to the substrate, whereas a flat, empty cavity was revealed for apoferritin. We also attempted to verify the conformational difference with magnetic-mode AFM. However, the resulting phase images failed to differentiate the proteins due to interference from the fringe effect. Despite this, the ferritin analysis revealed a sound correlation between the surface conductivity profiles and the phase profiles. In contrast, apoferritin showed a chaotic relationship in this respect. These results not only suggest that the magnetic domain of ferritin is limited to the iron aggregate in the core, but also demonstrate that AFM is a useful tool for protein conformation analysis.

Original languageEnglish
Pages (from-to)231-235
Number of pages5
JournalColloids and Surfaces B: Biointerfaces
Volume94
DOIs
Publication statusPublished - 2012 Jun 1

Fingerprint

Apoferritins
Ferritins
Proteins
proteins
Magnetic domains
Substrates
Tin oxides
Indium
Protein Conformation
Conformations
magnetic domains
profiles
Acoustic waves
Iron
tin oxides
indium
interference
iron
conductivity
cavities

Keywords

  • Atomic force microscopy
  • Ferritin
  • Protein conformation analysis

ASJC Scopus subject areas

  • Biotechnology
  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Surface differentiation of ferritin and apoferritin with atomic force microscopic techniques. / Ho, Ru Hung; Chen, Yu Hung; Wang, Chong Mou.

In: Colloids and Surfaces B: Biointerfaces, Vol. 94, 01.06.2012, p. 231-235.

Research output: Contribution to journalArticle

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