Lysases — are enzymes that catalyze the breaking of chemical bonds without the involvement of water. Unlike hydrolases and oxidoreductases, they facilitate the formation of double bonds or cycles, participate in the metabolism of carbohydrates, amino acids, and lipids, and also play a role in the synthesis of biomolecules. Their activity is important for maintaining energy balance and overall homeostasis in the body.
Definition and Classification
Lysases catalyze reactions of cleavage or addition of atom groups without hydrolysis. They act on different types of bonds — carbon, nitrogen, sulfur. The main subgroups are:
- decarboxylases — remove carbon dioxide from molecules;
- dehydrases — remove water molecules;
- carbohydrate lyases — break carbohydrate bonds;
- amino acid lyases — participate in reactions with amino acids.
Mechanisms of Action
The action of lyases is based on the formation of intermediate compounds that are processed into final products. They can:
- remove or add functional groups;
- form double bonds or cycles;
- interact with coenzymes (for example, pyridoxal phosphate enhances the activity of certain lyases).
Role in Metabolism
Lysases are involved in the metabolism of carbohydrates, fats, and proteins, providing energy to the body.
Important functions include:
- participation in the synthesis and breakdown of amino acids and fatty acids;
- formation of neurotransmitters (for example, dopamine and serotonin through decarboxylases);
- regulation of energy metabolism.
Applications in Medicine and Biotechnology
Lysases are used in the diagnosis and treatment of diseases, as well as in synthetic biology:
- used in clinical tests to determine metabolite levels;
- applied in the creation of biopharmaceuticals;
- allow the synthesis of recombinant proteins and new biomolecules.
Enzymes used in therapy
Below are examples of enzymes from this class that are used in the treatment of various diseases:
Research and Prospects
Modern research is focused on understanding the structure and functions of lyases, as well as their use as biocatalysts.
Promising directions include:
- development of new treatment methods for metabolic disorders;
- application in the synthesis of complex organic compounds;
- development of innovative pharmaceuticals.
The main challenges are related to the isolation and low stability of lyases under physiological conditions. This limits their widespread application.
It is expected that advancements in crystallography and molecular modeling methods will enable the creation of enzymes with improved properties, expanding their application possibilities in medicine, biotechnology, and industry.
Where lyases matter most in medicine
Lyases become clinically important in pathways where a substrate must be split quickly without hydrolysis: amino acid metabolism, the Krebs cycle, selected mediator pathways, and even oncology. That is why the same broad class includes both core metabolic enzymes and highly practical therapeutic tools.
The best-known example is asparaginase, which is genuinely used in acute lymphoblastic leukemia. It shows how an enzyme from a large general class can become a real drug with clear indications, adverse effects, and limitations.
Connection with the nervous system and amino acid metabolism
Some lyases work in pathways linked to amino acids and their transformations. In practice, this matters because neurotransmitter synthesis, protein tolerance, and resilience to metabolic stress may suffer when cofactors are lacking, liver function is impaired, or inherited enzyme defects are present.
For several lyases, pyridoxal-5-phosphate, the active form of vitamin B6, is a critical cofactor. This means B6 deficiency may reduce not only subjective well-being but also the efficiency of multiple enzyme reactions tied to amino acid metabolism.
Practical takeaway
Lyases should not be viewed as one supplement or one lab marker. They are a broad enzyme class whose significance appears through specific pathways: the Krebs cycle, histidine metabolism, amino acid decarboxylation, anticancer therapy, and rare inherited disorders.
In real practice, clinicians therefore assess not the “level of lyases in general,” but symptoms, biochemistry, cofactor status, and the specific pathways in which these enzymes are expected to work actively and consistently.