Various enzymes involved in amino acid metabolism (null)

Amino acid-metabolizing enzymes are a broad group comprising multiple distinct proteins that catalyze the breakdown and synthesis of amino acids. These include but are not limited to glutaminase 1 (GLS1), arginase 1 (ARG1), inducible nitric oxide synthase (iNOS), indoleamine 2,3-dioxygenase 1 (IDO1), tryptophan 2,3-dioxygenase (TDO), and interleukin 4 induced protein 1 (IL4I1).[2] They play critical roles in maintaining cellular homeostasis by regulating intracellular pools of amino acids required for protein synthesis and other metabolic processes. In disease contexts such as cancer and infection, their dysregulation can promote tumor growth directly by supporting anabolic needs or indirectly through suppression of anti-tumor immunity via depletion of key nutrients needed by effector lymphocytes.[2][7] Because this entry refers collectively to a class rather than a single molecular entity—and includes many unrelated proteins with different structures—it is not suitable as a canonical target name. **Note:** This entry is too broad/vague ("various enzymes...") rather than referring to one specific molecule/receptor. For structured data purposes it should be replaced with individual canonical names such as "Glutaminase", "Arginase", "Indoleamine 2,3-dioxygenase" etc.[6]

Other names

Amino acid-metabolizing enzymeEnzyme of amino acid metabolismAmino acid metabolic enzyme

Drugs typically act by inhibiting the enzymatic activity to block amino acid catabolism or biosynthesis, thereby restoring immune cell function or depriving cancer cells of essential nutrients. For example, inhibition of IDO1 prevents tryptophan depletion and immunosuppressive kynurenine production; glutaminase inhibition blocks glutamine utilization in tumor cells; arginase inhibition restores arginine levels to support T-cell function.