Perspectives for in situ scanning tunnel microscopic imaging of metalloproteins at HOPG surfaces

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Publication Details

Author list: Andersen JET, Jensen MH, Moller P, Ulstrup J

Publisher: Elsevier

Place: OXFORD

Publication year: 1996

Journal: Electrochimica Acta (0013-4686)

Journal acronym: ELECTROCHIM ACTA

Volume number: 41

Issue number: 13

Start page: 2005

End page: 2010

Number of pages: 6

ISSN: 0013-4686

Languages: English-Great Britain (EN-GB)

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Abstract

We have investigated the behaviour of the four-copper fungal metalloenzyme laccase (MW approximate to 68 kDa) at highly oriented pyrolytic graphite (HOPG) surfaces by ex situ and in situ STM. The four copper atoms are suited to stimulate long-range inelastic tunnel modes through the protein. The protein forms crystalline or amorphous structures of mu m lateral extension during evaporation of aqueous laccase solution at low ionic strength. Individual molecular-size structures distinct from the HOPG background, and possibly arising from tip dislodging can also be imaged. The HOPG surface cracks at certain potentials on in situ potentiostatic control and releases nm size HOPG scrap bits. These are clearly different in shape from the ex situ imaged molecular-size structures. Laccase could not, however, be imaged by in situ STM, most likely due to structural incompatibility between the hydrophobic HOPG surface and the strongly negatively charged protein, and to high protein surface mobility. Copyright (C) 1996 Elsevier Science Ltd.

Keywords

ex situ STM, HOPG, in situ STM, proteins

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