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
Keywords: Electron coupling, electronic transfer, structural dynamics, transition metal cofactors, quantum-mechanical calculations.
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