Estimation of Electronic Coupling for Charge Transfer in Bioinorganic Molecules

Fundamental biochemical processes such as respiration and photosynthesis rely on electron transfer (ET) between cofactors containing transition metal atoms. Donor-acceptor electronic coupling VDA is a key parameter that controls the ET rate. Accurate estimation of this parameter is challenging. In the paper, we consider different methods used to calculate the coupling matrix element for ET between transition-metal centers in proteins and discuss their advantages and limitations.