L-histidine (H)

Side chain polarity Reset
Display the imidazole group as Ball & Stick. At lower pH, this nitrogen is protonated, resulting in a positively charged imidazolium ion.
Compare the planar aromatic ring of His to the sidechain ring of Pro.

Some facts on L-histidine.

  1. Abbreviation: His.
  2. One-letter code: H.
  3. Molecular mass: 155 daltons.
  4. Side chain (or R-group) features:
Return to image of His.