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Related Concept Videos

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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Updated: Dec 26, 2025

Author Spotlight: Advancing Structural and Biochemical Studies of Proteins Through Thermal Shift Assays
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An enzyme in disguise.

Anders Liljas1

  • 1Biochemistry and Structural Biology, Lund University, Lund, Sweden.

Iucrj
|March 10, 2020
PubMed
Summary
This summary is machine-generated.

Researchers found a surprising link between carbonic anhydrase and nitrite reductase enzymes. This study reveals a shared mechanism for binding metal ions, specifically zinc and copper, through histidine residues.

Keywords:
carbonic anhydrasescatalytic metal ionscopper–carbonic anhydrase IInitrite reductases

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Carbonic anhydrase enzymes are crucial for various physiological processes.
  • Nitrite reductase enzymes are involved in nitrogen metabolism.
  • Both enzymes bind metal ions, but their structural similarities were not fully understood.

Purpose of the Study:

  • To investigate the remote structural similarity between carbonic anhydrase and nitrite reductase.
  • To confirm the conserved mechanism of metal ion binding in these enzymes.
  • To explore the functional implications of copper binding in carbonic anhydrase.

Main Methods:

  • X-ray crystallography to determine the structure of carbonic anhydrase with bound copper ions.
  • Biochemical assays to assess the enzymatic activity of modified carbonic anhydrase.
  • Comparative structural analysis of carbonic anhydrase and nitrite reductase.

Main Results:

  • A structural similarity was confirmed between zinc binding in carbonic anhydrase and copper binding in nitrite reductase, mediated by three histidine residues.
  • Carbonic anhydrase was shown to exhibit nitrite reductase activity when bound to two copper ions.
  • The study provides direct evidence for a conserved metal-binding motif across different enzyme families.

Conclusions:

  • The findings reveal a previously unrecognized evolutionary and functional link between carbonic anhydrase and nitrite reductase.
  • The conserved histidine-based metal-binding motif highlights its importance in enzyme catalysis.
  • This discovery opens new avenues for understanding enzyme function and designing novel metalloenzymes.