(Modeling proteins) (Chymotrypsin Mechanism: Step 1, Step 2, Step 3, Step 4, Step 5, Step 6)

Transition state between Steps 2 and 3 of Chymotrypsin Mechanism:
The proton on His 57 migrates to the substrate peptide nitrogen atom on Thr 253

  (PDB file) (ARC file)


The proton that was on histidinium His57 migrates to
the peptide nitrogen of Thr253.


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Interesting parts:
His57 Gly193 Asp194 Ser195 Trp252
Thr253 H2O

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