This pore is rimmed with several structurally conserved carbonyl oxygens in addition to the hydroxyl group of the invariant tyrosine from the carboxyl terminus of the SET area (Figure 1 ). Mutation of Tyr245 or Tyr305 lawyers in my area SET7/9 (Figure 4b ) alters its specificity from an H3 K4 mono-methylase to a tri- and di-methylase, respectively sixteen , lawyer articles 21 , whereas an Phe281Tyr mutation in the lysine-binding pocket of DIM-5 (Determine 4c ) converts this protein to an H3 K9 mono- or lawyers di-methylase 16 These mutations exemplify the F/Y swap (Determine 1 ) that establishes SET-area product specificities.
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