Carbonic anhydrase II in complex with carboxylic acid-based inhibitors

Area of Science:

• Biochemistry and structural biology
• Medicinal chemistry

Background:

• Carbonic anhydrases (CAs) are crucial enzymes implicated in various diseases.
• Current CA inhibitors often utilize sulfonamide moieties.
• There is a growing need for alternative inhibitors with improved isoform specificity.

Purpose of the Study:

• To investigate the potential of carboxylic acids as alternative zinc-binding groups for carbonic anhydrase inhibition.
• To elucidate the structural basis of inhibition by nicotinic acid and ferulic acid.
• To compare the inhibitory mechanisms of carboxylic acid-based inhibitors with existing drugs.

Main Methods:

• X-ray crystallography was employed to determine the structures of carbonic anhydrase II (CA II) in complex with nicotinic acid and ferulic acid.
• High-resolution structures were obtained at 1.70 Å and 1.50 Å, respectively.
• Structural superposition and comparative analysis with existing CA inhibitor structures were performed.

Main Results:

• Detailed X-ray crystal structures of CA II complexed with nicotinic acid and ferulic acid were determined.
• These structures provide insights into the binding modes and interactions of carboxylic acid inhibitors.
• Comparison with other inhibitors highlights the distinct properties of carboxylic acid-based CA inhibition.

Conclusions:

• Carboxylic acids represent a promising class of non-sulfonamide inhibitors for carbonic anhydrases.
• The structural data facilitates understanding of CA isoform-specific inhibition.
• This research supports the structure-guided design of novel, targeted CA therapeutics.