α-CAs from Photosynthetic Organisms

Area of Science:

• Biochemistry
• Enzymology
• Photosynthesis research

Background:

• Carbonic anhydrases (CAs) are essential enzymes catalyzing CO2 hydration.
• The alpha-class (α-CAs) is widespread, found in diverse organisms including photosynthetic ones.
• Limited functional, biochemical, and structural data exist for α-CAs from photosynthetic organisms.

Purpose of the Study:

• To provide an overview of recent literature on α-CAs in photosynthetic organisms.
• To highlight the known and potential roles of these enzymes.
• To identify research gaps concerning their structure-function relationships.

Main Methods:

• Literature review of recent studies on α-CAs in photosynthetic organisms.
• Analysis of existing functional, biochemical, and structural data.
• Synthesis of information regarding their roles in different photosynthetic life forms.

Main Results:

• In higher plants, α-CAs supply CO2 to Rubisco and regulate proton concentration in PSII.
• In algae and cyanobacteria, α-CAs are crucial for carbon-concentrating mechanisms (CCMs), photosynthesis, and CO2 sensing.
• Currently, crystal structures are available for only three algal α-CAs, limiting structure-function insights.

Conclusions:

• α-CAs play diverse and critical roles in photosynthesis across different plant and algal lineages.
• The scarcity of structural data hinders the understanding of specific roles and cellular localizations.
• Further research on α-CAs from photosynthetic organisms is essential to elucidate their structure-function dynamics.