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1 Ingest
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Carbonic Anhydrase Catalysis.pdf

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Proton Transfer in Human CA II.pdf

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Lehninger Principles of Biochemistry.epub

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2 Ask
Why does carbonic anhydrase activity fall at acidic pH?
3 Response

Acidic conditions protonate the zinc-bound hydroxide needed for CO₂ attack, while also slowing proton transfer through His64.

4 Verify
PDF Carbonic Anhydrase Catalysis.pdf
Page 6

The zinc-bound hydroxide is the nucleophile that attacks carbon dioxide. Below the apparent pKa, protonation of this group sharply reduces catalytic activity. Regeneration of the active form then depends on proton transfer through His64 to the surrounding buffer.

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