title: The direct electron transfer of myoglobin based on the electron tunneling in proteins.
abstract: The electron tunneling of the protein-polypeptide interactions was observed in the study of direct electron transfer of the myoglobin (Mb) on the electrode surface. The Mb was selected as a redox active protein and gelatine was selected to couple with Mb to form an electron tunneling. The electrochemical results indicated the presence of the electron tunneling and the direct electron transfer. The circular dichroism spectra suggested that the beta-sheet chain of gelatine could interact with alpha-helical chain to form an electron tunneling to promote the protein direct electrochemistry. The SDS-PAGE results proved that the electron tunneling between Mb and gelatine was noncovalent hydrogen bonds. The immobilized Mb showed a couple of quasi-reversible redox peaks with a formal potential of -0.37V (vs SCE) in 0.1 M pH 7.0 PBS. The modified electrodes displayed a rapid amperometric response to the reduction of oxygen, H2O2, and nitrite.
authors.affiliation: Key Lab of Analytical Chemistry for Life Science, Department of Chemistry, Nanjing University, Nanjing 210093, PR China.
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.forename: Jin-Zhong
authors.initials: JZ
authors.lastname: Xu
authors.forename: Hui
authors.initials: H
authors.lastname: Yao
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Zhu
authors.forename: Hong-Yuan
authors.initials: HY
authors.lastname: Chen
mesh_terms: D002942:Circular Dichroism; D004579:Electron Transport; D004591:Electrophoresis, Polyacrylamide Gel; D008958:Models, Molecular; D009211:Myoglobin / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D009211:Myoglobin