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Acetaldehyde-derived modifications on cytosolic human carbonic anhydrases
Fatemeh Bootorabi1, Janne Jänis, Vesa P Hytönen
1Institute of Biomedical Technology, University of Tampere and Tampere University Hospital, Tampere, Finland.
Journal of Enzyme Inhibition and Medicinal Chemistry
|June 18, 2011
Summary
Acetaldehyde covalently binds to human carbonic anhydrase (CA) II and XIII enzymes. This study reveals new insights into protein modification by acetaldehyde, with further in vivo investigations planned.
Area of Science:
- Biochemistry
- Enzymology
- Proteomics
Background:
- Acetaldehyde is known to modify proteins, including carbonic anhydrase (CA) II.
- Cytosolic carbonic anhydrase isozymes play crucial roles in various physiological processes.
Purpose of the Study:
- To investigate acetaldehyde adduct formation in human cytosolic carbonic anhydrase isozymes I, III, VII, and XIII.
- To identify which CA isozymes are most susceptible to acetaldehyde modification.
Main Methods:
- In vitro incubation of purified human CA isozymes with acetaldehyde.
- High-resolution mass spectrometry to detect and quantify acetaldehyde adducts on CA proteins.
Main Results:
- Acetaldehyde formed covalent adducts most efficiently with carbonic anhydrase II and XIII.
- Carbonic anhydrase II bound up to 19 acetaldehyde molecules, likely due to abundant surface lysine residues.
- Carbonic anhydrase XIII formed more adducts (up to 25) than its lysine residue count (16).
- Acetaldehyde modification resulted in minor changes to CA catalytic activity.
Conclusions:
- This study provides the first evidence of acetaldehyde binding to multiple human cytosolic CA isozymes.
- The findings highlight carbonic anhydrase II and XIII as primary targets for acetaldehyde modification.
- Further in vivo studies are necessary to elucidate the functional consequences of these modifications.
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