Carbonic anhydrase: a multigene-multifunctional enzyme

Area of Science:

• Biochemistry
• Enzymology
• Molecular Biology

Background:

• Carbonic anhydrases (CA) are essential zinc metalloenzymes catalyzing the reversible hydration of carbon dioxide (CO2) to bicarbonate (HCO3-).
• Vertebrates possess seven distinct carbonic anhydrase isozymes (CAI-VII), which are single-chain peptides.
• These isozymes exhibit significant variations in kinetic properties despite structural similarities, influencing numerous physiological and biochemical pathways.

Purpose of the Study:

• To provide an overview of carbonic anhydrase isozymes in vertebrates.
• To highlight the diversity and functional significance of CA isozymes across different species.
• To underscore the importance of CA isozyme kinetic properties in biological systems.

Main Methods:

• Literature review of carbonic anhydrase research.
• Comparative analysis of CA isozyme distribution in vertebrates (teleost fish, birds, mammals).
• Examination of kinetic properties and functional roles of CA isozymes.

Main Results:

• Seven CA isozymes (CAI-VII) are encoded by distinct genes in vertebrates.
• CA isozyme distribution varies across species: one in teleost fish, three in birds, and all seven in mammals.
• Significant differences in kinetic properties exist among CA isozymes, despite their overall structural similarity.

Conclusions:

• Carbonic anhydrase isozymes play critical roles in diverse physiological and biochemical processes.
• The differential expression and kinetics of CA isozymes contribute to species-specific biological functions.
• Understanding CA isozyme diversity is key to comprehending their multifaceted biological roles.