Charge and Field Effects in Biosystems—3 by Fraser Armstrong, Julea Butt, Jacques Breton, Andrew J.

By Fraser Armstrong, Julea Butt, Jacques Breton, Andrew J. Thomson (auth.), Milton J. Allen, Stephen F. Cleary, Arthur E. Sowers, Donald D. Shillady (eds.)

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550:22. S. (1977) J. BioI. Chern. 252:5498. S. (1988) Proc. Natl. Acad. Sci. USA 85:1354. A. (1984) Biochern. 23:5616. D. (1985) Biochirn. Biophys. Acta 808:209. THERMODYNAMIC AND ELECTROCHEMICAL STUDIES OF THE ELECTRON TRANSFER REACTIONS OF HEMOGLOBIN Jennifer L. Detrich, Gabriel A. Erb, David A. Beres and Lyman H. Rickard Department of Chemistry Millersville University Millersville, PA 17520 INTRODUCTION Heme containing proteins function as oxygen carriers, electron carriers or enzymes in biological systems.

06. o ~ G o 10 2D 30 40 50 60 Time (seconds) FIGURE 4. Potential step chronoabsorptometry of hemoglobin indium oxide. 0. Overpotentials: 400, 500, 600, 700, 800 mV vs NHE. 6 , 200 300 , 400 500 600 Overpotential 700 800 900 (mV) FIGURE 5. Dependence of rate constant on overpotential. , 1984). 29 for electron transfer at a tin oxide electrode surface modified with tetraethylammonium chloride. 14 for electron transfer at an unmodified carbon fiber electrode. 97 x lO-4cm/sec (Zhu and Dong 1990). As can be seen from these results, hemoglobin's formal rate constant can vary over a wide range dependent on the type of electrode, modification of the electrode surface and other experimental conditions.

BioI. Chem. 247:1338. , and Nakanishi M. (1984) J. Biochem. 95:581. R. (1986) J. Electroanal. Chem. 198:89. R. (1988) J. Electroanal. Chem. 256:111. L. (1983) J. Am. Chem. Soc. 105:4481. H. 40 (1987) J. Am. Chern. Soc. 109:3559. Palmer G. (1987) Pure and ADDI. Chern. 59:749. L. D. (1987) J. Am. Chern. Soc. 109:3559. M. (1991) Science 252:1164. R. (1977) Biochern. 16:1377. Smith T. (1980) J. Colloid Interface Sci. 75:51. , and Buse G. (1987) Eur. J. Biochem. 164:295. , and Yu H. (1987) Langmuir 3:932.

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