Eukaryotes

Eukaryotes are more complex cells that have a true nucleus enclosed by a membrane, along with other specialized structures called organelles, like mitochondria and the endoplasmic reticulum. These cells make up plants, animals, fungi, and many microorganisms. In eukaryotic cells, managing important molecules like polyamines is crucial for cell growth, division, and stability. Polyamine synthesis in eukaryotes is mainly controlled by regulating the activity of two key enzymes: ornithine decarboxylase (ODC) and S-adenosylmethionine decarboxylase (SAM decarboxylase). Instead of relying mainly on controlling the production of the enzymes at the genetic level, eukaryotic cells more directly regulate the activity of these enzymes to fine-tune polyamine levels as needed.