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Biochemical studies by Castro et al. have recently revealed a crucial role for a general acid in the catalysis of nucleic acid transfer in distinct classes of polymerases. For HIV-RT LYS220 was identified as proton donor. This was unanticipated from a structural point of view, since in all ternary crystal structures of HIV-RT LYS220 are too distant from the active site to fulfill this role. In this...
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