The Twenty

Atlas/Asp

D

Aspartate

Asp

AcidicNon-essentialHydrophilicSide-chain pKa 3.9115 Da

Acetate (–CH₂COOH)

  • The shorter of the two acidic residues (one methylene).
  • Side-chain pKa ≈ 3.9, so it is deprotonated (Asp⁻) at physiological pH.

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Structure of Aspartate
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