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Molecular modeling of the various side chains in position 531 on the structure of transcription complex:(A) (Ser); (B) (Lys); (C) (Arg); (D) (Glu), (E) (His); (F) (Gly). Active center Mg2+ ion, RNA transcript as well as R529 and L533 residues interacting with RNA transcript are indicated. The modeling was made onto the structure of TEC from Taq (PDB code: 2O5J).
