Histidine is an important catalytic residue found at the active sites of many enzymes. In many cases, histidine appears toremove protons or to transfer protons from one location to another.  Use resonance forms to show why the protonated form of histidine is a particularly stable cation

Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter20: Carboxylic Acids And Nitriles
Section20.SE: Something Extra
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Histidine is an important catalytic residue found at the active sites of many enzymes. In many cases, histidine appears to
remove protons or to transfer protons from one location to another.
  Use resonance forms to show why the protonated form of histidine is a particularly stable cation

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