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PaHisGS and PaATPPRT quaternary structures and allosteric activation. (A) PaATPPRT hetero-octamer, where catalysis is enhanced. The second PaHisGS homodimer is behind the PaHisZ tetramer. (B) Nonactivated PaHisGS homodimer and (C) overlay of activated and nonactivated PaHisGS dimers. In all structures, PaHisGS is bound to PRPP, ATP, and Mg2+.29
