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. 2020 Apr 24;8:352. doi: 10.3389/fbioe.2020.00352

FIGURE 3.

FIGURE 3

Four proposed catalytic mechanisms for NHase catalysis. (A) The innersphere mechanism; (B) the outer-sphere mechanism; (C) the newly proposed outer-sphere mechanism (Indirectly Activated Nucleophile); (D) Direct attack of activated Sulfenate toward substrate. The blue and orange color of the oxygen atoms represent the different sources of oxygen during catalytic process.