Coupling Coherence Distinguishes Structure Sensitivity in Protein Electron Transfer

Coupling coherence distinguishes structure sensitivity in protein electron transfer.

Quantum mechanical analysis of electron tunneling in nine thermally fluctuating cytochrome b562 derivatives reveals two distinct protein-mediated coupling limits. A structure-insensitive regime arises for redox partners coupled through dynamically averaged multiple-coupling pathways (in seven of the nine derivatives) where heme-edge coupling leads to the multiple-pathway regime. A structure-dep...

Long-range transfer of electron-phonon coupling in oxide superlattices.

The electron-phonon interaction is of central importance for the electrical and thermal properties of solids, and its influence on superconductivity, colossal magnetoresistance and other many-body phenomena in correlated-electron materials is the subject of intense research at present. However, the non-local nature of the interactions between valence electrons and lattice ions, often compounded...

Estimates of electronic coupling for excess electron transfer in DNA.

Electronic coupling V(da) is one of the key parameters that determine the rate of charge transfer through DNA. While there have been several computational studies of V(da) for hole transfer, estimates of electronic couplings for excess electron transfer (ET) in DNA remain unavailable. In the paper, an efficient strategy is established for calculating the ET matrix elements between base pairs in...

Quantum effects in electron transfer reactions with strong electronic coupling

Subunit structure of electron transfer flavoprotein.

The electron transfer flavoprotein from pig liver mitochondria is a 57,000-dalton electron transferase which links several primary flavoprotein dehydrogenases with the mitochondrial electron transport system. The protein was previously reported to be a dimer of apparently identical subunits. There are conflicting estimates in the literature regarding the FAD content of the protein. The results ...