title: Effect of protein orientation on electron transfer between photosynthetic reaction centers and carbon electrodes.
abstract: A new type of monolayer of photosynthetic reaction centers (RC) with the primary donor facing the carbon electrode has been constructed using a new bifunctional linker and genetically engineered protein. Comparison of protein in two different orientations with linkers binding to the opposite sides of the protein demonstrates the possibility of utilizing the constructed surfaces as photoelectronic devices. The results show improvement of the electron transfer efficiency when RC is bound with the primary donor (P) facing the electrode (P-side). In either protein orientation, electron transfer within the protein is unidirectional and when applying a voltage RC operates as a photorectifier. Electron transfer between the protein and carbon electrodes in the constructed devices is most likely occurring by tunneling.
authors.affiliation: Center for Bio/Molecular Science & Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Trammell
authors.forename: Anthony
authors.initials: A
authors.lastname: Spano
authors.forename: Ronald
authors.initials: R
authors.lastname: Price
authors.forename: Nikolai
authors.initials: N
authors.lastname: Lebedev
mesh_terms: D002244:Carbon / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004307:Dose-Response Relationship, Radiation; D004553:Electric Conductivity; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D010777:Photochemistry / Q000295:instrumentation* / Q000379:methods; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000528:radiation effects*; D011487:Protein Conformation; D011829:Radiation Dosage; D012666:Semiconductors
chemical_list: D020099:Coated Materials, Biocompatible; D045322:Photosynthetic Reaction Center Complex Proteins; D002244:Carbon