PubMed · 2026-05-14
Scientists have mapped how chemical tags added to proteins after they're made control a key metabolic pathway involving the amino acid proline, which helps plants survive drought, salt, and other stresses. These regulatory switches, found in everything from plants to human cancer cells, could be targeted to breed tougher crops or develop new medical treatments.
Three types of post-translational modifications, phosphorylation, acetylation, and ubiquitination, regulate the activity, stability, and location of proline metabolism enzymes across multiple kingdoms of life.
These modifications control enzyme oligomerization (how proteins cluster together) and metabolic flux, directly affecting how efficiently proline is produced or broken down under stress.
The same regulatory mechanisms operate in both plant stress tolerance and cancer cell survival, suggesting evolutionary conservation and dual relevance for agriculture and medicine.