Amino acid biosynthesis

Amino acid biosynthesis is a fundamental biological process consisting of various metabolic pathways through which organisms produce the amino acids necessary for protein synthesis and cellular maintenance. While humans can synthesize non-essential amino acids, they lack the pathways for essential amino acids, which must be obtained through diet. In clinical practice, this biological process is targeted primarily in oncology; for example, Acute Lymphoblastic Leukemia (ALL) cells often lack asparagine synthetase and become dependent on serum asparagine, which can be therapeutically depleted using the enzyme L-asparaginase (StatPearls). Additionally, many antimicrobial and herbicidal agents target specific biosynthetic enzymes—such as those in the shikimate or branched-chain amino acid pathways—that are unique to bacteria, fungi, or plants and absent in humans (NCBI, Bookshelf NBK22425). This high degree of evolutionary divergence allows for the development of drugs with selective toxicity, effectively inhibiting the growth of pathogens while sparing human host cells. Overall, targeting amino acid biosynthesis remains a critical strategy for managing metabolic dependencies in cancer and developing selective anti-infectives.

Other names

Amino acid biosynthetic pathwayDe novo amino acid synthesisAmino acid metabolismAmino acid production

Drugs targeting amino acid biosynthesis generally act by either enzymatically depleting circulating levels of specific amino acids (e.g., asparagine depletion by L-asparaginase) or by inhibiting specific enzymes within a biosynthetic pathway (e.g., inhibition of dihydropteroate synthase by sulfonamides or EPSP synthase by glyphosate), leading to a cessation of protein synthesis and cell death (StatPearls, PMID: 30020619; Nature Reviews Cancer, PMID: 28127048).