The analysis of the optimized structures of the MichaelisMenten complex indicate that the polar residues at position 13 (Cys or Ser) stabilize the deprotonated GS , which in turn acts as the catalytic Brnsted base and abstracts the proton at position C2 of substrate 7 (Extended Data Fig
doi:10.1159/000349922 Basu A, Betts NM, Mulugeta A, Tong C, Newman E, Lyons TJ

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