CAZac: an activity descriptor for carbohydrate-active enzymes

Area of Science:

• Biochemistry
• Enzymology
• Bioinformatics

Background:

• The Carbohydrate-Active enZYme database (CAZy) is a primary resource for classifying carbohydrate-active enzymes (CAZymes).
• Current functional annotation relies on the Enzyme Commission (EC) number system, which has limitations for detailed functional comparisons.
• There is a need for a more comprehensive system to describe CAZyme functions.

Purpose of the Study:

• To develop and implement a novel multicriterion system, CAZyme activity descriptor (CAZac), for describing CAZyme functions.
• To enable more sophisticated searches within the CAZy database for functional insights.
• To facilitate the study of CAZyme evolution, substrate specificity, and reaction mechanisms.

Main Methods:

• Developed CAZac, a system detailing CAZyme mechanisms, glycosidic bond orientations, subsites, and inter-residue connectivities.
• Implemented CAZac for key CAZyme families: glycoside hydrolases, glycoside phosphorylases, transglycosidases, polysaccharide lyases, and lytic polysaccharide monooxygenases.
• Integrated CAZac into the CAZy database for advanced search capabilities.

Main Results:

• CAZac provides a detailed, multicriterion description of CAZyme activities.
• The system allows for complex database searches to explore functional diversity.
• New insights into the evolution of substrate specificity and enzyme mechanisms are achievable.

Conclusions:

• CAZac significantly enhances the functional annotation and searchability of CAZymes in the CAZy database.
• This system offers a powerful tool for researchers investigating enzyme evolution and function.
• CAZac represents a significant advancement in the study of carbohydrate-active enzymes.