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Cytochrome c interaction with hematite (α-Fe2O3) surfaces by Carrick M. Eggleston; Nidhi Khare; David M. Lovelace is a Physics and Astronomy article available to read on EtoBox.

What is Cytochrome c interaction with hematite (α-Fe2O3) surfaces about?

The interaction of metalloproteins such as cytochromes with oxides is of interest for a number of reasons, including molecular catalysis of environmentally important mineral-solution electron transfer reactions (e.g., dehalogenations) and photovoltaic applications. Iron reduction by bacteria, thought to be cytochrome mediated, is of interest for geochemical and environmental remediation reasons. As a baseline for understanding cytochrome interaction with ferric oxide surfaces, we report on the interaction of mitochondrial cytochrome c (Mcc), a well-studied protein, with hematite (␣-Fe 2 O 3 ) surfaces. Mcc sorbs strongly to hematite from aqueous solution in a narrow pH range corresponding to opposite charge on Mcc and hematite (between pH 8.5 and 10, Mcc is positively charged and hematite surfaces are negatively charged). Cyclic voltammetry of Mcc using hematite electrodes gives redox potentials characteristic of Mcc in a native conformational state, with no evidence for unfolding on the hematite surface. Atomic force microscopy imaging is consistent with a loosely attached adsorbate that is easily deformed by the AFM tip. In phosphate-containing solution, Mcc adhers to the surface

Who reads Cytochrome c interaction with hematite (α-Fe2O3) surfaces?

Author

Carrick M. Eggleston; Nidhi Khare; David M. Lovelace

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0368-2048)

Published

2006

Language

EN

Field

Physics and Astronomy (Physical Sciences)