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Working mechanism for long-range PCET pathway in E. coli class Ia RNR
The current hypothesis holds that protons (blue arrows) move orthogonally to the electron (red arrow) in β2 and co-linearly with the electron in α2. The mechanism across the α/β interface is unknown. There is no direct evidence that W48 and its putative H+ acceptor, D237, participate in long-range PCET during turnover.
